## Latex-Suite Reference

Abstract

Latex-Suite attempts to provide a comprehensive set of tools to view, edit and compile LaTeX documents in Vim. Together, they provide tools starting from macros to speed up editing LaTeX documents to functions for forward searching .dvi documents. Latex-Suite has been possible because of the contributions of many people. Please see latex-suite-credits for a list of people who have helped.

Latex-Suite is released under the Vim charityware license. For license and conditions of use look at |copyright|. Replace all occurrences of Vim'' with Latex-Suite''. The current copyright holders of Latex-Suite are Srinath Avadhanula and Mikolaj Machowski.

Homepage: http://vim-latex.sourceforge.net

## 1 Installation and recommended Settings

If you are reading this, it most probably means that you have already installed Latex-Suite and the help files. If this is not the case, follow the detailed instructions on Latex-Suite's download page.

Make sure that you create a few necessary settings in your ~/.vimrc.

" REQUIRED. This makes vim invoke Latex-Suite when you open a tex file.
filetype plugin on

" IMPORTANT: win32 users will need to have 'shellslash' set so that latex
" can be called correctly.
set shellslash

" OPTIONAL: This enables automatic indentation as you type.
filetype indent on

" OPTIONAL: Starting with Vim 7, the filetype of empty .tex files defaults to
" 'plaintex' instead of 'tex', which results in vim-latex not being loaded.
" The following changes the default filetype back to 'tex':
let g:tex_flavor='latex'


" this is mostly a matter of taste. but LaTeX looks good with just a bit
" of indentation.
set sw=2
" TIP: if you write your \label's as \label{fig:something}, then if you
" type in \ref{fig: and press <C-n> you will automatically cycle through
" all the figure labels. Very useful!
set iskeyword+=:


In the unlikely case that Latex-Suite is installed, but you do not want to use it (e.g., if it is installed system-wide and you use some other package to deal with tex files), you can suppress the loading of Latex-Suite by setting

let b:suppress_latex_suite = 1

## 2 Inserting Templates

This functionality is available via the TeX-Suite > Templates menu. This module provides a way to insert custom templates at the beginning of the current file.

When Latex-Suite first starts up, it scans the template directory and creates menu items based on the files found there. When you select a template from this menu, the file will be read in above the first line of the current file.

A template file can utilize placeholders for initializing the cursor position when the template is read in and subsequent movement. In addition, template files can contain dynamic elements such as the time of creation of a file etc, by using vim expressions.

You can place your own templates in the template directory in order for them to be available via the menu.

### Note

Templates are also accessible for non-gui users with the command |:TTemplate|. The argument should be name of the corresponding template file. If the command is called without arguments (preferred usage), then a list of available templates is displayed and the user is asked to choose one of them.

## 3 Latex-Suite Macros

Latex-Suite ships with a very comprehensive set of insert mode and |visual-mode| mappings and menu items to typeset most of the LaTeX elements.

### Note

These mappings are are not standard mappings in the sense that only the last character is mapped. See plugin/imaps.vim for further documentation. For example, in the case of the mapping EFI provided by Latex-Suite you can press the characters 'E', 'F' and 'I' as slowly as you wish (unlike the normal imap command where timeout issues are involved). The characters are visible as you type them (unlike normal imaps) and you can use the movement or backspace key to correct yourself unlike normal mappings.

### Place Holders

Almost all macros provided in Latex-Suite implement Stephen Riem's bracketing system and Gergely Kontra's JumpFunc() for handling place-holders. This consists of using "place-holders" to mark off locations where the next relevant editing has to be done. As an example, when you type EFI in |insert-mode|, you will get the following:

\begin{figure}[<+htpb+>]
\centering
\includegraphics{<+file+>}
\caption{<+caption text+>}
\label{fig:<+label+>}
\end{figure}<++>

The text <+htpb+> will be selected and you will be left in |select-mode| so that you can continue typing straight away. After having typed in the placement specifier, you can press <Ctrl-J> (while still in insert-mode). This will take you directly to the next "place-holder". i.e, <+file+> will be visually selected with Vim in select mode again for typing in the file name. This saves on a lot of key presses.

### Over-riding Latex-Suite Macros

If you wish to change these macros from their default values, for example, if you wish to change w to expand to \omega instead of its default expansion to \wedge, you should use the IMAP function as described in the Using IMAP() section.

An important thing to note is that if you wish to over-ride macros created by Latex-Suite rather than merely create new macros, you should place the IMAP() calls in a script which gets sourced after the files in Latex-Suite. A good place typically is as a file-type plugin file in the ~/.vim/after/ftplugin/ directory. (Use ~/vimfiles if you are using WINDOWS). For example to over-ride w to \omega instead of \wedge, place the following line in (say) ~/.vim/after/ftplugin/tex_macros.vim:

call IMAP('w', '\omega', 'tex')

To delete a mapping, you can use

call IUNMAP('FEM', 'tex')

in ~/.vim/after/ftplugin/tex_macros.vim.

### Note

It is important to use a file-name which will get sourced on a FileType event. Therefore you must use a file-name which conforms to the standards as described in |ftplugin-name|.

### Pausing Macro expansion

If you wish to temporarily suspend the imaps functionality, then you can set the Imap_FreezeImap to 1. If you set g:Imap_FreezeImap to 1, then it will be a system-wide setting. Setting b:Imap_FreezeImap will affect only the current buffer.

The following sections describe the various editing macros provided by Latex-Suite.

### 3.1 Environment Mappings

Latex-Suite provides a rich set of mappings to insert, enclose and modify LaTeX environments, i.e, \begin{...} ... \end{...} pairs. There are several possibilities for the customization of the inserted environments, see the section about customizations.

#### 3.1.1 Inserting Environments

Latex-Suite provides the following ways to insert environments

##### 3.1.1.1 Method 1: Pressing <F5>

If you press <F5> in the insert or normal mode while on an empty line, Latex-Suite prompts you with a list of environments you might want to insert. You can either choose one from the list or type in a new environment name. If you press <F5> on a line which already has a word, then that word is used instead of prompting.

See Tex_Env_name for a description of how Latex-Suite uses the word to form the expansion and how to modify Latex-Suite's behavior.

The list of environments which Latex-Suite prompts you with (when <F5> is pressed on an empty line) is formed from the Tex_PromptedEnvironments setting.

In addition to this setting, Latex-Suite also lists environments found in custom packages as described in the section Package actions.

##### 3.1.1.2 Method 2: Using <S-F1>-<S-F4>

The shifted function keys, <S-F1> to <S-F4> can be mapped to insert very commonly used environments. The environments mapped to each key can be customized via the g:Tex_HotKeyMappings setting.

##### 3.1.1.3 Method 3: Using three letter sequences

Environments can also be inserted by pressing a 3 capital letter sequence starting with an E. The sequence of 3 letters generally tries to follow the following rules:

1. All environment mappings begin with E
2. If the environment can be broken up into 2 distinct words, such as flushright (flush + right), then the next 2 letters are the first letters of the 2 words. Example:
flushleft  (_f_lush + _l_eft)  ---> EFL
flushright (_f_lush + _r_ight) ---> EFR
minipage   (_m_ini  + _p_age)  ---> EMP
If on the other hand, the environment name cannot be broken up into 2 distinct words, then the next 2 letters are the first 2 letters of the name of the environment. Example:
equation (_eq_uation)          ---> EEQ

Unfortunately there are some environments that cannot be split in two words and first two letters in name are identical. In this case shortcut is created from E, first and last letter. Example:

quote     (_q_uot_e_)          ---> EQE
quotation (_q_uotatio_n_)      ---> EQN

Of course, not every last one of the environments can follow this rule because of ambiguities. In case of doubt, pull down the Tex-Environments menu. The menu item should give the hint for the map.

#### 3.1.2 Enclosing in Environments

Latex-Suite provides visual-mode mappings which enclose visually selected portions of text in environments. There are two ways provided to do this.

##### 3.1.2.1 Method 1: Pressing <F5>

You can also select a portion of text visually and press <F5> while still in visual mode. This will prompt you with a list of environments. (This list can be customized via the g:Tex_PromptedEnvironments setting). You can either choose from this list or type in a new environment name. Once the selection is done, Latex-Suite encloses the visually selected portion in the chosen environment.

##### 3.1.2.2 Method 2: Using three letter mappings

You can also select text visually and press a sequence of three characters beginning with , (the single comma character) and the selected text will be enclosed in the chosen environment. The three letter sequence follows directly from the three letter sequence used to insert environments as described here. The following example describes the rule used:

If ECE inserts a \begin{center}...\end{center} environment, then to enclose a block of selected text in \begin{center}...\end{center}, simply select the text and press ,ce. The rule simply says that the leading E is converted to , and the next 2 letters are small case.

Some of the visual mode mappings are sensitive to whether you choose line-wise or character-wise. For example, if you choose a word and press ,ce, then you get {\centering word}, whereas if you press ,ce on a line-wise selection, you get:

\begin{center}
line
\end{center}

#### 3.1.3 Changing Environments

Pressing <S-F5> in normal mode detects which environment the cursor is presently located in and prompts you to replace it with a new one. The innermost environment is detected. For example, in the following source:

$$\begin{array}{ccc} 2 & 3 & 4 \end{array}$$

if you are located in the middle "2 & 3 & 4" line, then pressing <S-F5> will prompt you to change the array environment, not the equation environment. In addition, Latex-Suite will also try to change lines within the environment to be consistent with the new environment. For example, if the original environment was an equation environment with a \label command, then changing it to an equation* environment will delete the \label.

Pressing <F5> in normal mode has the same effect as pressing <F5> in insert-mode, namely you will be prompted to choose an environment to insert.

### 3.2 Command Mappings

Latex-Suite provides a rich set of mappings to insert, enclose and modify LaTeX commands.

#### 3.2.1 Inserting LaTeX commands

Pressing <F7> in insert or normal mode while the cursor is touching a word will insert a command formed from the word touching the cursor.

For certain common commands, Latex-Suite will expand them to include additional arguments as needed. For example, frac becomes \frac{<++>}{<++>}<++>. Otherwise, it will simply change the word under the cursor as follows

word --> \word{<++>}<++>

You can define custom expansions of commands using the Tex_Com_{name} setting as described in here.

If <F7> is pressed when the cursor is on white-space, then Latex-Suite will prompt you to choose a command and insert that instead.The list of commands is constructed from the g:Tex_PromptedCommands setting and also from commands which Latex-Suite finds while scanning custom packages which Latex-Suite finds. See the Package actions section for details on which files are scanned etc.

#### 3.2.2 Enclosing in a command

You can select a portion of text visually and press <F7> while still in visual mode. This will prompt you with a list of commands. (This list can be customized via the g:Tex_PromptedCommands setting). You can either choose from this list or type in a new command name. Once the selection is done, Latex-Suite encloses the visually selected portion in the chosen command.

#### 3.2.3 Changing commands

In both insert and normal mode <S-F7> will find out if you are presently within an environment and then prompt you with a list of commands to change it to.

### 3.3 Font Mappings

These mappings insert font descriptions such as: \textsf{<++>}<++> with the cursor left in place of the first placeholder (the <++> characters).

Mnemonic:

1. first letter is always F (F for font)
2. next 2 letters are the 2 letters describing the font.

Example: Typing FEM in insert-mode expands to \emph{<++>}<++>.

Just like environment mappings, you can visually select an area and press sf to have it enclosed in: \textsf{word} or

{\sffamily
line
}

depending on character-wise or line-wise selection.

### 3.4 Section Mappings

These maps insert LaTeX sections such as:

\section{<++>}<++>

etc. Just as in the case of environments and fonts, can be enclosed with a visual selection. The enclosing is not sensitive to character or line-wise selection.

SPA for part
SCH for chapter
SSE for section
SSS for subsection
SS2 for subsubsection
SPG for paragraph
SSP for subparagraph

Example: SSE in insert mode inserts

\section{<++>}<++>

If you select a word or line and press ,se, then you get

\section{section name}

### 3.5 Greek Letter Mappings

Lower case

a through z expand to \alpha through \zeta.

Upper case:

D = \Delta
F = \Phi
G = \Gamma
Q = \Theta
L = \Lambda
X = \Xi
Y = \Psi
S = \Sigma
U = \Upsilon
W = \Omega

### Note

LaTeX does not support upper case for all greek alphabets.

Just like other Latex-Suite mappings, these mappings are not created using the standard imap command. Thus you can type slowly, correct using <BS> etc.

### 3.6 Auc-Tex Key Bindings

These are simple 2 key expansions for some very commonly used LaTeX elements:

^   Expands To   \Hat{<++>}<++>
_   expands to   \bar{<++>}<++>
6   expands to   \partial
8   expands to   \infty
/   expands to   \frac{<++>}{<++>}<++>
%   expands to   \frac{<++>}{<++>}<++>
@   expands to   \circ
0   expands to   ^\circ
=   expands to   \equiv
\   expands to   \setminus
.   expands to   \cdot
*   expands to   \times
&   expands to   \wedge
-   expands to   \bigcap
+   expands to   \bigcup
(   expands to   \subset
)   expands to   \supset
<   expands to   \le
>   expands to   \ge
,   expands to   \nonumber
~   expands to   \tilde{<++>}<++>
;   expands to   \dot{<++>}<++>
:   expands to   \ddot{<++>}<++>
2   expands to   \sqrt{<++>}<++>
|   expands to   \Big|
I   expands to   \int_{<++>}^{<++>}<++>

(again, notice the convenient place-holders)

In addition the visual mode macros are provided:

(  encloses selection in \left( and \right)
[  encloses selection in \left[ and \right]
{  encloses selection in \left\{ and \right\}

### Note

By default, typing Alt-<key> in Vim takes focus to the menu bar if a menu with the hotkey <key> exists. If in your case, there are conflicts due to this behavior, you will need to set

set winaltkeys=no

in your $VIM/ftplugin/tex.vim in order to use these maps. ### Customizing the maps If for some reason, you wish to not map the <Alt> keys, (some European users need to use the <Alt> key to enter diacritics), you can change these maps to other keys as described in the section Customizing Alt-key maps. #### 3.10.1 <Alt-L> This is a polymorphic insert-mode mapping which expands to one of the following depending on the character just before the cursor location. Character before cursorExpansion (\left( <++> \right) [\left[ <++> \right] |\left| <++> \right| {\left\{ <++> \right\} <\langle <++> \rangle q\lefteqn{<++>}<++> If the character before the cursor is none of the above, then it will simply insert a \label{<++>}<++>. #### 3.10.2 <Alt-B> This insert-mode mapping encloses the previous character in \mathbf{}. #### 3.10.3 <Alt-C> In insert mode, this key is polymorphic as follows: 1. If the previous character is a letter or number, then capitalize it and enclose it in \mathcal{}. 2. otherwise insert \cite{}. In visual mode, it will simply enclose the selection in \mathcal{} #### 3.10.4 <Alt-I> This mapping inserts an \item command at the current cursor location depending on which environment the cursor is enclosed in. The style of the \item command is dependent on the enclosing environment. By default, <Alt-I> has styles defined forthe following environments: EnvironmentStyle itemize\item enumerate\item theindex\item thebibliography\item[<+biblabel+>]{<+bibkey+>} <++> description\item[<+label+>] <++> <Alt-I> is intelligent enough to account for nested environments. For example, \begin{itemize} \item first item \item second item \begin{description} \item[label1] first desc \item[label2] second % <Alt-I> will insert "\item[<+label+>] <++>" if % used here \end{description} \item third item % <Alt-I> will insert "\item " when if used here. \end{itemize} % <Alt-I> will insert nothing ("") if used here The style used by <Alt-I> can be customized using the g:Tex_ItemStyle_environment variable. ### 3.11 Custom Macros This functionality available via the TeX-Suite.Macros menu, provides a way of inserting customized macros into the current file via the menu. When Latex-Suite starts up, it scans the $VIM/ftplugin/latex-suite/macros/ directory and creates a menu from the files found there. Each file is considered as a single macro. You can place your own macros in this directory, using placeholders if wanted.

When you choose a macro from the menu, the corresponding file is read into the current buffer after the current cursor position. In non-gui mode, you can use the |TMacro| command instead of choosing from the menu. This command takes the macro file name as an argument. When called without arguments (preferred usage), then a list of available macro files is displayed and the user is prompted to choose one of them).

There are some other tools provided in this menu, namely:

 {New} Creates a new (unnamed) buffer in the latex-suite/macros/ directory. Use the command :TexMacroNew in non-gui mode. {Edit} Opens up the corresponding macro file for editing. Use |:TexMacroEdit| in non-gui mode. When you try to edit {macro} not from local directory Latex-Suite will copy it to your local directory with suffix "-local". If local copy already exists Latex-Suite prompt for overwriting it. {Delete} Deletes the corresponding macro. Use the prefixed numbers for fast navigation of menus. Use |:TexMacroDelete| in non-gui mode. When you choose to delete {macro} which is not in your local directory Latex-Suite will refuse to delete it. {Redraw} Rescans the macros/ directories and refreshes the macros list.

### 3.12 Making your own Macros via IMAP()

If you find the need to create your own macros, then you can use the IMAP() function provided with Latex-Suite. See Why use IMAP() for a short explanation of why you might prefer IMAP() over Vim's standard :imap command. An example best explains the usage:

:call IMAP('NOM', '\nomenclature{<++>}<++>', 'tex')

This will create a Latex-Suite-style mapping, where if you type NOM in insert mode, you will get \nomenclature{<++>}<++> with the cursor left in place of the first <++> characters. See IMAP() syntax for a detailed explanation of the IMAP() command.

For maps which are triggered for a given filetype, the IMAP() command above should be put in the filetype plugin script for that file. For example, for tex-specific mappings, the IMAP() calls should go in $VIM/ftplugin/tex.vim. For globally visible maps, you will need to use the following in either your ~/.vimrc or a file in your $VIM/plugin directory.

augroup MyIMAPs
au!
au VimEnter * call IMAP('Foo', 'foo', '')
augroup END

IMAP mappings can be removed by IUNMAP, e.g.,

call IUNMAP('FEM','tex')

#### 3.12.1 Why use IMAP()

Using IMAP instead of Vim's built-in :imap command has a couple of advantages:

1. The 'ttimeout' option will generally limit how easily you can type the left hand side for a normal :imap. if you type the left hand side too slowly, then the mapping will not be activated.
2. If you mistype one of the letters of the lhs, then the mapping is deactivated as soon as you backspace to correct the mistake.
3. The characters in lhs are shown on top of each other. This is fairly distracting. This becomes a real annoyance when a lot of characters initiate mappings.

#### 3.12.2 IMAP() syntax

Formally, the syntax which is used for the IMAP function is:

call IMAP (lhs, rhs, ft [, phs, phe])

ArgumentExplanation
lhs

This is the "left-hand-side" of the mapping. When you use IMAP, only the last character of this word is actually mapped, although the effect is that the whole word is mapped.

If you have two mappings which end in a common lhs, then the mapping with the longer lhs is used. For example, if you do

call IMAP('BarFoo', 'something', 'tex')
call IMAP('Foo', 'something else', 'tex')

Then typing BarFoo inserts "something", whereas Foo by itself inserts "something else".

Also, the nature of IMAP() makes creating certain combination of mappings impossible. For example if you have

call IMAP('foo', 'something', 'tex')
call IMAP('foobar', 'something else', 'tex')

Then you will never be able to trigger "foobar" because typing "foo" will immediately insert "something". This is the "cost" which you incur over the normal :imap command for the convenience of no 'timeout' problems, the ability to correct lhs etc.

rhs

The "right-hand-side" of the mapping. This is the expansion you will get when you type lhs.

This string can also contain special characters such as <enter> etc. To do this, you will need to specify the second argument in double-quotes as follows:

:call IMAP('EFE', "\\begin{figure}\<CR><++>\\end{figure}<++>", 'tex')

With this, typing EFE is equivalent to typing in the right-hand side with all the special characters in insert-mode. This has the advantage that if you have filetype indentation set up, then the right hand side will also be indented just as if you had typed it in normally.

You can also set up a Latex-Suite style mapping which calls a custom function as follows:

:call IMAP('FOO', "\<C-r>=MyFoonction()\<CR>", 'tex')

where MyFoonction is a custom function you have written. If MyFoonction also has to return a string containing <++> characters, then you will need to use the function IMAP_PutTextWithMovement(). An example best explains the usage:

call IMAP('FOO', "\<C-r>=AskVimFunc()\<CR>", 'vim')
" Description:
let name = input('Name of the function : ')
if name == ''
let name = "<+Function Name+>"
end
let islocal = input('Is this function scriptlocal ? [y]/n : ', 'y')
if islocal == 'y'
let sidstr = '<SID>'
else
let sidstr = ''
endif
return IMAP_PutTextWithMovement(
\ "\" ".name.": <+short description+> \<cr>" .
\ "Description: <+long description+>\<cr>" .
\ "\<C-u>function! ".name."(<+arguments+>)<++>\<cr>" .
\       "<+function body+>\<cr>" .
\ "endfunction \" "
\ )
endfunction

ft

The file type for which this mapping is active. When this string is left empty, the mapping applies for all file-types. A filetype specific mapping will always take precedence.

phs, phe

If you prefer to write the rhs with characters other than <+ and +> to denote place-holders, you can use the last 2 arguments to specify which characters in the rhs specify place-holders. By default, these are <+ and +> respectively.

Note that the phs and phe arguments do not control what characters will be displayed for the placeholders when the mapping is actually triggered. What characters are used to display place-holders when you trigger an IMAP are controlled by the Imap_PlaceHolderStart and Imap_PlaceHolderEnd settings.

## 4 Package Handling

Latex-Suite has a lot of functionality written to ease working with packages. Packages here refers to files which you include into the LaTeX document using the \usepackage command.

When you first invoke Latex-Suite, it scans the $VIM/ftplugin/latex-suite/packages directory for package script files and creates a menu from all the files found there. This menu is created under TeX-Suite > Packages > Supported. This menu contains a list of packages "supported" by Latex-Suite. When you choose one of the packages from this menu (for example the amsmath package), then a line of the form \usepackage[<++>]{amsmath}<++> will be inserted into the current file. The \usepackage line can also be inserted in an easy manner in the current file by pressing <F5> while in the preamble of the current document. This will set up a prompt from the supported packages and ask you to choose from one of them. If you do not find the package you want to insert in the list, you can type in a package-name and it will use that. Pressing <F5> in the preamble on a line containing a single word will construct a \usepackage line from that word. You can also use the TPackage to insert the \usepackage line. Once you have inserted a \usepackage line, for supported packages, you can use the Options and Commands menus described in the next section. ### 4.2 Actions taken for supported packages Latex-Suite takes the following actions for packages detected when a file is loaded, or a new \usepackage line is inserted using one of the methods described in the previous section. If you are using the GUI and you have g:Tex_Menus set to 1, Latex-Suite will create the following sub-menus  TeX-Suite > Packages > Options TeX-Suite > Packages > Commands where <package> is the package you just inserted (or was detected). You can use these menus to insert commands, environments and options which Latex-Suite recognizes as belonging to this package. ### Note While inserting an option, you need to position yourself in the appropriate place in the document, most commonly inside the square braces in the \usepackage[]{packname} command. Latex-Suite will not navigate to that location. In addition to creating these sub-menus, Latex-Suite will also scan the $VIM/ftplugin/latex-suite/dictionaries directory and if a dictionary file corresponding to the package file is found, then it will add the file to the 'dict' setting in Vim so you can use the <C-X><C-K> command to complete words from that file.

For example, the SIUnits package has a custom dictionary.

If a package detected at startup is found by Latex-Suite in the current directory or in a location specified by the g:Tex_TEXINPUTS variable, Latex-Suite will scan the package for \newenvironment and newcommand lines and also append any commands and environments found to the list of commands and environments which you are prompted with when you press <F5> or <F7> in insert mode.

In addition, the TeX-Suite > Packages menu also contains the following submenus

Update.  This command is to be invoked with the cursor placed on the package name. If the corresponding package is found, then a sub-menu with the supported commands and options is created.

Update All.  This function reads the preamble of the document for \usepackage lines and if Latex-Suite supports the detected packages, then sub-menus containing the package options and commands are created.

### 4.3 Automatic Package detection

Whenever Latex-Suite begins editing a new LaTeX file, it scans it for \usepackage{name} lines, and if a supported package is found, then it will create sub-menus and add to the 'dict' setting as described above.

If a master-file has been specified, then it will scan that file instead of the current file. See the section Custom Packages to see which files Latex-Suite will scan in more detail.

For all the packages detected in this manner, Latex-Suite will take certain actions as described in the section package support..

#### 4.3.1 Custom Packages

Often times, the preamble can become too long, and some people prefer to put most of their personalization in a custom package and include that using a \usepackage line. Latex-Suite tries to search such customs package for other \usepackage lines, so that supported packages included in this indirect manner can also be used to create sub-menus, extend the 'dict' setting etc. The most obvious place to place such custom packages is in the same directory as the edited file. In addition, LaTeX also supports placing custom packages in places pointed to by the $TEXINPUTS environment variable. If you use the $TEXINPUTS variable in LaTeX, and you wish Latex-Suite to search these custom packages for \usepackage lines, then you need to initialize the g:Tex_TEXINPUTS variable.

The g:Tex_TEXINPUTS variable needs to be set in the same format which Vim uses for the 'path' setting. This format is explained in detail if you do

:help file-searching

from within Vim.

Therefore the value of g:Tex_TEXINPUTS will most probably be different from $TEXINPUTS which your native LaTeX distribution uses. Example: let g:Tex_TEXINPUTS = '~/texmf/mypackages/**,./**' The ** indicates that all directories below the directory ~/texmf/mypackages and ./ are to be scanned for custom packages. ### Note The present directory '.' is always searched. You need not include that in g:Tex_TEXINPUTS. ### 4.4 Writing supporting for a package Supporting a package is easy and consists of writing a vim script with the same name as the package and placing it in the $VIM/ftplugin/latex-suite/packages directory. A package script should define two variables as described in the next two sections. In addition to these two variables, you can also define any functions, environment definitions etc. in this file.

#### 4.4.1 g:Tex_package_option_<package>

This setting is a string containing a comma separated list of options supported by this package.

Example:

g:Tex_package_option_mypack = 'opt1,opt2=,sbr:group1,opt3,opt4'

The = suffix means that the option takes a value. Use sbr:group name to separate options into sub-menus. All successive options will be clubbed into the group1 sub-menu till the next sbr: option is encountered.

#### 4.4.2 g:Tex_package_<package>

    g:TeX_package_<package> = "pre:Command,pre:Command1"
More detailed example is in latex-suite/packages/exmpl file (slightly
outdated).
Here is short summary of prefixes which can be used in package files:
(x - place with cursor, <++> - |placeholder|)

{env:command}  Environment: creates simple environment template
\begin{command}
x
\end{command}<++>
{eno:command}  Environment with option:
\begin[x]{command}
<++>
\end{command}<++>
{ens:command[<<option>>]...}  Environment special:
\begin[<<option>>]...{command}
<++>
\end{command}<++>
{bra:command} Brackets:
\command{x}<++>
{brd:command} Brackets double:
\command{x}{<++>}<++>
{brs:command[<<option>>]...} Brackets special (as environment special:
\command[<+x+>]{<++>}{<++>}<++>
{nor:command} Normal:
\command<Space
{noo:command} Normal with option:
\command[x]<++>
{nob:command} Normal with option and brackets:
\command[x]{<++>}<++>
{pla:command} Plain:
command<Space
{spe:command} Special:
command   <-literal insertion of command
{sep:command} creates separator. Good for aesthetics and usability :)
Can be used also in package variable.

Command can be also given without prefix:. The result is
\command


## 5 Latex Completion

Latex-Suite provides an easy way to insert references to labels and bibliographic entries and also provide filename arguments to commands such as \includegraphics. Although the completion capabilities are very diverse, Latex-Suite only uses a single key (<F9> by default) to do all of it. Pressing the <F9> key does different things based on where you are located. Latex-Suite tries to guess what you might be trying to complete at the location where you pressed <F9>. For example, pressing <F9> when you are within a \ref command will try to list the \label's in the present directory. Pressing it when you are in a \cite command will list bibliography keys. Latex-Suite also recognizes commands which need a file name argument and will put up an explorer window for you to choose a filename.

Most of Latex-Suite's completion capabilities depend on the python interface of vim. Both python2 and python3 are supported. Hence,

python print "Hello."

or

python3 print("Hello.")

should work.

### 5.1 Latex-Suite \ref completion

Pressing <F9> when you are within a partially completed \ref command will split open a window (named __OUTLINE__) which contains a nicely formatted list of all the \labels found in the present project. The \labels are heirarchically arranged according to which \section, \subsection etc of the overall document structure they are present in. For example, when you first press <F9> after typing \ref{, you should see something like:

+-- 54 lines: 2. Kinematics--------------------------------
+-- 98 lines: 3. Aerodynamics of the MFI thorax------------
+-- 40 lines: 4. Jump Resonance in Fourbar Mechanisms------
+-- 28 lines: 5. Design and Fabrication Issues-------------


Each chapter is |fold|ed away so that you can quickly jump to the correct section/subsection in which the relevant equation is defined. This makes inserting references significantly faster for large projects with hundreds of equations. You can then open some of the folds to see for example:

+-- 54 lines: 2. Kinematics--------------------------------
3. Aerodynamics of the MFI thorax
3.1. Aerodynamic modeling of the MFI wing forces
3.1.1. Geometric Specification
eqn:wingnormal-pos
\nhat =  T_z(\theta_2) T_y(\theta_y)T_x(\theta_x)\nhat_0,
eqn:T-1
T_1(\theta_2) &= T_z(\theta_2)


The <Tab> key is mapped in this window to toggle folds so that you can quickly open/close folds in order to navigate the heirarchy faster. Once you are positioned on a label, press <Enter>. This closes the __OUTLINE__ window, returns to the window in which you pressed <F9> and inserts the reference at the current cursor position.

### Filtering labels by prefix

You can press <F9> after typing part of the \label. In this case, Latex-Suite only presents \labels which begin with the already filled characters. You can use this to choose between equations, figures, tables etc. if you consistently label equations to begin with eqn:, figures to begin with fig: etc. For example, with this scheme, pressing <F9> after typing \ref{eqn: will only list equations.

### Note

Latex-Suite works the same way if you press <F9> after any command which contains the letters ref. Thus you can complete \eqref in exactly the same manner.

This method of preseting the \labels depends on Vim being compiled with python[3] support. To check if you have this, see the output of the :ver command. If you see something like +python or +python3, you are all set. Failing this, you will need to have python somewhere in your $PATH. ### 5.2 Latex-Suite \cite completion Latex-Suite provides an easy way to insert references to bibliographic entries. Pressing <F9> when the cursor is placed inside a partially completed \cite command will split open a new window (named __OUTLINE__) which contains a formatted and syntax highlighted list of all bibtex entries found. For example, pressing <F9> after typing \ref{ should present you with a window which looks something like this: Article [dickinson:science:99] "Wing rotation and aerodynamic basis of insect flight" M. H. Dickinson and F-O. Lehman and S. P. Sane In Science, 1999 Article [ellington:84:part1] "The Aerodynamics of Hovering Insect Flight. I. The Quasi-Steady Analysis" Ellington, C P In Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, 1984 Article [ellington:84:part2] "The Aerodynamics of Hovering Insect Flight. II. Morphological Parameters" Ellington, C P In Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, 1984  You can easily jump from one entry to another using the 'n' and 'p' keys (to go to the next / previous entry respectively). You can also filter out a subset of the bibtex entries by pressing 'f' while in this window. Doing this presents the following prompt: Field acronyms: (:let g:Tex_EchoBibFields = 0 to avoid this message) [t] title [a] author [b] booktitle [j] journal [y] year [p] bibtype (you can also enter the complete field name) Enter filter criterion [field<space>value]:  At the prompt, type a ellington Notice that the letter a is an acronym for author according to the prompt above. Therefore this filter only shows those bibtex entries whose author field contains the text ellington. You can keep narrowing your selection by repeatedly filtering the results. If you would like to remove all the filters and see all entries again, press 'a', which removes all the filters. You can also sort the bibtex entries based on a field. To do this, press 's'. This will present you with a prompt like in the case of the filter and you are asked to choose a field. In this case, you would type in a single character. This sorts the entries according to that field. ### Note <F9> will also work in a similar way after any command which contains the word cite in it. For example, pressing <F9> will also work with \citenum etc. The following logic is applied to find out which bibliographic entries are included in the completion. 1. Firstly, if the present file has a master-file defined for it, then Latex-Suite will perform the following steps on that file instead of on the current file. 2. First, the file is scanned for a \bibliography command or a \addbibresource command. To explain better, assume that a command \bibliography{file1,file2} is found in the present file. For each bibliography file, say file1, Latex-Suite first tries to see if a .bib file, file1.bib can be found. If so, it will scan it for bib-keys of the form @BOOK{ etc., and add these searches to the completion list. If a .bib file cannot be found, then it will try to see if file1.bbl can be found. If so, Latex-Suite will search it for bib-keys of the form \bibitem and add these to the completion list. You can set the location where Latex-Suite will search for .bib and .bbl files using the |Tex_BIBINPUTS| variable. 3. If a \bibliography command is not found, then Latex-Suite tries to scan the present file for a \begin{thebibliography} environment. If found, Latex-Suite searches the present file for bib-keys of the form \bibitem. ### 5.3 Latex-Suite filename completion When you press <F9> at a location where Latex-Suite guesses a filename needs to be typed, then a new explorer window will open up with the list of files. You can use this window to change directories etc. Pressing <enter> on a filename in the explorer window will automatically close the explorer window, return to the location where you pressed <F9> from and insert the filename into that position. Latex-Suite also tries to guess what kinds of files you might not want to insert and hides those accordingly. For example, if you press <F9> when you are located at \includegraphics{, then Latex-Suite knows that you will not want to insert .tex files. Therefore, the explorer window will automatically hide these files. As of now, Latex-Suite recognizes the following commands for filename completion. Along with the commands, this table also lists the files which Latex-Suite will not show for completing each command. commandhide pattern \bibliography'^\.,\.[^b]..$'
\include \includeonly'^\.,\.[^t]..$' \includegraphics'^\.,\.tex$,\.bib$,\.bbl$,\.zip$,\.gz$'
\input''

### 5.4 Custom command completion

Latex-Suite also recognizes certain commonly used LaTeX commands for the <F9> key. At the moment, the \bibliographystyle, \addtocontents and the \addcontentsline commands are recognized, although more will be added in the future. When you press the <F9> after such a command, Latex-Suite will prompt you with a list of arguments which make sense for the command.

This functionality is available for commands for which a global variable of the form g:Tex_completion_{<command>} is defined where <command> is the command name. This variable is a comma separated list of values which this command takes. For example, the argument to the \bibliographystyle command is commonly one of abbr,alpha,plain,unsrt. Therefore, Latex-Suite defines

let g:Tex_completion_bibliographystyle = 'abbr,alpha,plain,unsrt'

You can define your own completion variables in a similar manner for commands which you might use.

## 6 LaTeX Compiling

This functionality, available via the TeX-Suite menu, provides various tools to compile and debug LaTeX files from within Vim.

If you are using commonly used LaTeX tools, then you should be all set as soon as you download and install Latex-Suite. In order to compile a LaTeX file, simply press \ll while editing the file. This runs latex on the current file and displays the errors in a |quickfix-window| below the file being edited. You can then scroll through the errors and press <enter> to be taken to the location of the corresponding error. Along with the errors being listed in the quickfix window, the corresponding log file is also opened in |preview| mode beneath the quickfix window. It is scrolled automatically to keep in sync with the error being viewed in the quickfix window. You will be automatically taken to the location of the first error/warning unless you set the g:Tex_GotoError variable to 0.

Latex-Suite also supports compiling LaTeX into formats other than DVI. By default, Latex-Suite supports PDF and PS formats. In order to choose a format other than DVI, use the TTarget command or the TeX-Suite > Target Format menu item. This will ask you to type in the name of the target format you want to compile to. If a rule has been defined for the format (as described in the next section), then Latex-Suite will switch to that format.

Trying to choose a format for which no rule has been defined will result in Latex-Suite displaying a warning message without taking any action.

If you are using a multiple file project and need to compile a master file while editing other files, then Latex-Suite provides a way to specify the file to be compiled as described in latex-master-file.

### 6.1 Setting Compilation rules

In order to compile LaTeX files into various formats, Latex-Suite needs to know which external programs to call and in which way they need to be called. This information is provided to Latex-Suite via a number of "rules". For each format you want to compile to, you need to specify a rule. A rule is specified by defining a variable of the form:

g:Tex_CompileRule_<format>

where <format> is a string like "pdf", "dvi" etc.

Example: By default, Latex-Suite uses the following rule for compiling LaTeX documents into DVI.

g:Tex_CompileRule_dvi = 'latex --interaction=nonstopmode $*' Default values are also provided for ps and pdf formats. You might want to change these rules in texrc according to your local tex environment. ### Note For win32 users user MikTeX, sometimes the latex compiler's output has a bug where a single number is split across different lines. In this case, put the included vim-latex file distributed with Latex-Suite. ### 6.2 Handling dependencies in compilation Latex-Suite also handles compiling dependencies automatically via certain rules which specify the "dependency chain" for each target format. For example, if in your case, you use .tex -> .dvi -> .ps -> .pdf to generate pdf files from dvi files, then you will need to specify the following setting in your Latex-Suite configuration (see customizing Latex-Suite for where these settings should go): let g:Tex_FormatDependency_pdf = 'dvi,ps,pdf'  This is a comma separated string of formats specifying the order in which the formats to be compiled into should be chosen. With this setting, if you set the target format to pdf, then the next time you compile via the \ll shortcut, Latex-Suite will first generate a dvi file, then use that to generate the ps file and finally create the pdf file from that. ### Note If any of the intermediate formats is listed in the g:Tex_MultipleCompileFormats setting as described in the section Compiling multiple times, then Latex-Suite might make multiple calls to the compiler to generate the output file of that format. Along with the g:Tex_FormatDependency_{format} setting, you should ofcourse specify the rule for compiling to each of the formats as described in the previous section. For example, with the setting above, you could use: let g:Tex_CompileRule_dvi = 'latex --interaction=nonstopmode$*'
let g:Tex_CompileRule_ps = 'dvips -Ppdf -o $*.ps$*.dvi'
let g:Tex_CompileRule_pdf = 'ps2pdf $*.ps' ### Note By default, Latex-Suite does not specify any compiler dependencies. Each target format for which a rule has been derived will be compiled independently. ### 6.3 Compiling multiple times Most LaTeX compilers need to be re-run several times in several commonly occurring situations in order to get a final camera ready copy. For example, when \label's change, when new \cite commands are added etc. If the target format you are compiling to requires multiple compilations, then you will need to include the format in the g:Tex_MultipleCompileFormats setting. This is a comma separated string of formats which need multiple compilations to be generated correctly. By default, this setting contains just the dvi format. If you use the pdflatex compiler to generate pdf files, then you might want to also include pdf into the above setting. For every format included in the g:Tex_MultipleCompileFormats setting described above, Latex-Suite will use the following logic to generate the file. Note that although the following description uses latex to refer to the compiler, it could be some other compiler such as pdflatex for generating pdf output. 1. If there was a .idx file, then remember its contents. 2. Run latex. 3. If the .idx file changed due to the latex compiler, then run makeindex to redo the .ind file and then remember to rerun latex. 4. If the .aux file generated by the latex compiler contains a \bibdata line, then it means that we are using a .bib file. Therefore, run bibtex. ### Note This means that we will always run bibtex whenever we use the \bibliography command whether or not we actually need to. At this time, Latex-Suite does not parse the .aux file before and after the latex compiler to see if we are required to rerun bibtex. 5. If the .bbl file changes because of this, then remember to rerun latex again. 6. Also, we check to see if the LaTeX compiler gives certain standard warnings which notify that we need to compile once again. In this case also, remember to rerun LaTeX. 7. If we found we had to rerun latex, then we repeat the steps above but not running makeindex or bibtex again. The LaTeX file is compiled atmost 5 times using this logic. These steps will ensure that on most platforms/environments, you will get a clean output with all the cross-references, citations etc correctly labelled and ordered. ### 6.4 Customizing the compiler output Most LaTeX compilers produce a very large amount of output during compilation, most of which is not relevant to debugging type-setting errors. The compiler plugin provided with Latex-Suite (which is an enhanced version of the standard compiler plugin maintained by Artem Chuprina), provides a way to filter the compiler output so that the actual errors/warnings can be presented much more concisely. The compiler plugin is set up by default to function in a "non-verbose", "ignore-common-warnings" mode, which means that irrelevant lines from the compiler output will be ignored and some very common warnings are also ignored. Latex-Suite does this via the global variable g:Tex_IgnoredWarnings. This is a list of patterns, which can be used to filter out (or ignore) some or the warnings and errors reported by the compiler. See the link above for its default value. Latex-Suite uses the g:Tex_IgnoreLevel setting to set a default ignore level. For example, for the default value of 4, Latex-Suite ignores warnings and errors matching the first 4 patterns in g:Tex_IgnoredWarnings. In addition to setting a default value of the ignore level, Latex-Suite provides the ability to set the level dynamically, using the TCLevel command. For example, if you issue the command: TCLevel 3 from within Vim, then the next time you compile the document, Latex-Suite will ignore warnings and errors which match the first three patterns in g:Tex_IgnoredWarnings. When TCLevel is called with the unquoted string strict as follows: TClevel strict then Latex-Suite switches to a "verbose", "no-lines-ignored" mode which is useful when you want to make final checks of your document and want to be careful not to let things slip by. See the explanation of the settings g:Tex_IgnoredWarnings and g:Tex_IgnoreLevel to find out how to customize the filtering done by Latex-Suite ### 6.5 Compiling parts of a file Latex-Suite also provides a way to compile a fragment of a document. This can be very useful while debugging a complex equation or one chapter in a book, etc. To do this, visually select a portion of the text and press \ll while in visual mode. The visually selected portion will be saved to a temporary file with the preamble from the current document prepended. Latex-Suite will then switch focus to this temporary file and compile it. Continue to debug this file as required and then replace the portion of the original file with this one. Pressing \lv while viewing the temporary file will view the output file generated from the temporary file, not the original file Two commands |TPartComp| and |TPartView| are provided to be able to get this functionality via the command line. From release 1.6 onwards of Latex-Suite, the temporary file created for part compilation will reside in the same directory as the file from which the fragment is being created. This ensures that any relative path-names defined in the fragment will still work. Latex-Suite will attempt to clean the temporary file(s) created when Vim exits. ### 6.6 Load log file after external compilation If you do not use Latex-Suite, but an external program or script to compile your tex documents, you can use :cg | copen to load (and parse) the .log file. If you use vim to compile your documents, you might want to use :let$max_print_line=1024

such that latex will not wrap the filenames. Otherwise, you could use it as an environment variable or simply use

max_print_line=1024 pdflatex ...

in your terminal. If you are using latexmk, you should set

$ENV{'max_print_line'} = '1024';$log_wrap = $ENV{'max_print_line'}; in your ~/.latexmkrc. ## 7 Latex Viewing and Searching ### 7.1 Setting Viewing rules In order to view the output files created by compiling the source files, you need to specify which external program Latex-Suite should call. You can specify the external program using one of two settings Tex_ViewRule_format or Tex_ViewRuleComplete_format. By default, Latex-Suite has default settings for viewing various common output formats via the Tex_ViewRule_format settings, so that if you are using commonly used programs, you should be all set to view compiled files from within Vim by simply pressing \lv. ### Note The viewing function also takes the *.latexmain file into account to decide which file to show. If pressing \lv does not work, then it most probably has to do with incorrect settings of the g:Tex_ViewRule_<format> where <format> is the format you are attempting to view. See the link above for how to set this according to your system. ### Note On Windows and OS/X, you can leave the view rule empty to open the document with the default viewer on your system. On Linux/UNIX systems, you can use the xdg-open command to open the document with the default viewer. In addition to viewing the files, Latex-Suite also supports forward and inverse searching for certain common tools for viewing documents. See the next few sections for details on forward and inverse searching, including an overview of viewers. ### 7.2 Forward Searching documents Forward searching refers to making a viewer display a given document at a given location from within Vim. At present, these viewers are known to support forward searching, but viewers that are not listed here may work, too: ViewerOSSupported documentsComment SkimApple / OS X TigerPDFSupports also inverse searching PDFViewApple / OS XPDFNo longer in development, supports also inverse searching TeXniscopeApplePDF, DVI YAPWindowsDVI, PSships with MikTex Sumatra PDFWindowsPDF kdviLinux/UNIXDVI okularLinux/UNIXDVI, PDF, PS and many moreIncluded in KDE 4 xdviLinux/UNIXDVI xdvikLinux/UNIXDVI Pressing \ls from within Vim should make the viewer display the portion of the document where your cursor is placed. ### Note OS/X users need to set the g:Tex_TreatMacViewerAsUNIX flag to 1 and provide a UNIX-like viewrule, that expects as arguments the document, the linenumber and the sourcefile in this order. ### Enabling Forward and Inverse Searching Most DVI viewers need "source-special" information in order to do forward (and inverse) searching. This information is embedded in the dvi file if the LaTeX source is compiled with the --src-specials option. By default, Latex-Suite does not supply this argument to the compiler. See the section on g:Tex_CompileRule_dvi to find out how this option can be set. Pdf viewers usually use a synctex(.gz) file. This can be enabled with the compiler flag -synctex=1 for pdflatex. Within this suite it is however enabled by default, unless you change g:Tex_CompileRule_pdf. ### 7.3 Inverse Searching Inverse searching refers to a viewer (either pdf or dvi) telling Vim to display the LaTeX source file at a given location. Usually this happens with double-clicking or clicking while pressing the shift/control button in the viewer window. The actual method depends on the viewer application. You will need to enable searching in order to use this functionality. You will also need to specify certain settings to the viewer conveying the syntax which it needs to use to tell Vim how to display the source file. In windows you need to supply the following command in the apporpriate setting of your viewer: "C:\Program Files\vim\vim74\gvim" -c ":RemoteOpen +%l %f" Or if you have (g)Vim added to your $PATH simply:

gvim -c ":RemoteOpen +%l %f"

The command :RemoteOpen is supplied when you install Latex-Suite. In YAP, you can set this option under View > Options > Inverse Search in the Command Line field. And in SumatraPdf you can set this option under Settings > Options > Set inverse search command-line.

On *nix machines, Latex-Suite attempts to call the DVI viewer in such a way that it already knows how to communicate with Vim. If this does not seem to be working, you can use the RemoteOpen command described above.

## 8 Latex Folding

Latex-Suite ships with the plugin SyntaxFolds.vim which is a plugin for creating "fake" syntax folds on the fly. The fold method is actually manual but the folding is based on LaTeX syntax. This offers a speed increase over regular syntax folding. Ofcourse it has the disadvantage that the folds are not dynamic, i.e newly created syntax items are not automatically folded up. (This is a compromise between speed and convenience).

When you open up a LaTeX file, all the portions will be automatically folded up. However, no new folds will be created until you press \rf. (rf stands for "refresh folds").

The fold-text is set to the first line of the folded text unless the fold is a table, figure etc. (an environment). In this case, if a \caption and/or a label is found in the folded region, then those are used to make a more meaningful fold-text, otherwise the second line of the environment is displayed along with the name of the environment. In other words, the following

\begin{figure}[h]
\centering
\includegraphics[height=6cm]{slidercrank.pdf}
\caption{The Slider Crank Mechanism.}
\label{fig:slidercrank}
\end{figure}
% a LaTeX comment.
$$\sin(\pi) = 0$$

will be shown as:

+---  5 lines: figure (fig:slidercrank) : The Slider Crank Mechanism. -----
% a LaTeX comment.
+---  3 lines: equation () : \sin(\pi) = 0 --------------------------------

### 8.1 Default Folding Scheme in Latex-Suite

By default, Latex-Suite creates folds in the following manner:

\part
%%fakepart
\chapter
%%fakechapter
\section
%%fakesection
\subsection
%%fakesubsection
\subsubsection
%%fakesubsubsection
\paragraph
%%fakeparagraph
\item
\equation
\align
\figure
\table
\footnote

The indentation shows the "nestedness" of the folding scheme. See the next section to see how you can change this scheme.

### 8.2 Customizing what to fold

From version 1.6 onwards, the folding in Latex-Suite can be controlled to a large extent via a number of global variables.

#### 8.2.1 Tex_FoldedSections

This entry defines which sections will be folded. This setting is a comma separated list of section names. The default value is:

part,chapter,section,subsection,subsubsection,paragraph

Each of the entries in the list will fold up a section of the corresponding name and the corresponding %%fakesection. The %%fakesection section is provided as a means for the user to group lines into "fake" sections. In particular, it is useful to fold the introduction of a section that is not part of a subsection:

\section{Latex-Suite}
%%fakesubsection Introduction
A short introduction of the features of Latex-Suite.
\subsection{Installation}
Installation instructions.

Without the %%fakesubsection the introduction would not be folded separately from the section.

It is also possible, to add section names at the same level of hierarchy. These have to be separated by "|". This is, e.g., useful for the KOMA classes, which add "\addcap":

" let g:Tex_FoldedSections = 'part|addpart,chapter|addchap,section|addsec,subsection,subsubsection,paragraph,subparagraph'

#### 8.2.2 Tex_FoldedEnvironments

This entry defines which environments will be folded. It is a comma separated string of words each of which defines a single environment. The default setting is

verbatim,comment,eq,gather,
align,figure,table,thebibliography,
keywords,abstract,titlepage

The words need not be standard Latex environments. You can add any word you like. Also, each word will fold up all environments whose name begins with that word. For example, in the setting above, the word "align" folds up the \begin{align}, \begin{align*}, \begin{aligned} environments. To avoid this, you can replace the word "align" with "align}".

#### 8.2.3 Tex_FoldedCommands

This entry defines which commands will be folded. It is a comma separated string of words each of which defines a single command. The default setting is empty, i.e no commands are folded. The words need not be standard Latex commands. You can use whatever words you like. Each word will fold all commands whose name begins with that word as in the case of the Tex_FoldedEnvironments variable.

### Note

It is very difficult to fold commands reliably because it is very difficult to create a regexp which will match a line containing unmatched parentheses (or curly brackets), but will not match a line containing matched parentheses.

Just to make things safer, only lines which start a command but do not contain additional curly braces after the command has started are folded. In other words, if you wanted to fold the the command "mycommand", then the lines

\mycommand{This is a line
and some more text on the next line
}

will be folded, but the lines

\mycommand{This is a \textbf{line}
and some more text
}

will not be folded. This is a bug which is very difficult to fix.

#### 8.2.4 Tex_FoldedMisc

This entry defines fold syntax for certain items which do not naturally fit into the section, environment of command lists. It is a comma separated list of words. The default value is:

item,preamble,<<<

### Note

Unlike the other Tex_FoldedXXXX variables, the words in this setting are limited to take values from the following list:

ValueMeaning
itemFolds up the \items within list environments
preambleFolds up the preamble of a document. (The part between the \documentclass command and the \begin{document} environment)
<<<Folds defined manually by the user using the <<< and >>> strings as fold-markers.

Any other words in the Tex_FoldedMisc setting are silently ignored.

#### 8.2.5 Advanced Fold setting details

The order of the words in the Tex_FoldedXXXX variables is important. The order defines the order in which the folds are nested. For example, the value "subsection,section" for the Tex_FoldedSections variable will not fold any subsections at all. This is because the folds are created in the reverse order in which they occur in the Tex_FoldedSections setting and also, once a fold is created, the interior of the fold is not examined for creating additional folds. In the above case, this means that a \section is folded first and then its interior is not examined further. The correct value should have been "section,subsection"

Each of the fold setting variables Tex_FoldedSections, Tex_FoldedEnvironments etc., as explained previously is a comma separated string of variables. However, to make it easier to add to the default settings without having to repeat the whole default setting again, Latex-Suite uses the following logic in forming the complete setting string from the Tex_FoldedXXXX variables. If the variable starts with a comma, then Tex_FoldedXXXX is added to the end of the default string rather than replacing it. Similarly, if it ends with a comma, then it will be prepended to the beginning of the default setting rather than replacing it.

For example, if Tex_FoldedEnvironments is set to the string "myenv", then only an environment of the form \begin{myenv} will be folded. However, if the Tex_FoldedEnvironments setting is ",myenv", then the \begin{myenv} environment will be folded after all other environments in the default setting have been folded. On the other hand if Tex_FoldedEnvironments is of the form "myenv,", the \begin{myenv} environment will be folded before the rest of the environments in the default setting.

## 9 Multiple file LaTeX projects

Many LaTeX projects contain multiple source files which are \included from a master file. A typical example of this situation is a directory layout such as the following

thesis/
main.tex
abstract.tex
intro/
intro.tex
figures/
fig1.eps
fig2.eps
chapter1/
chap1.tex
figures/
fig1.eps
conclusion/
conclusion.tex
figures/

In the above case, main.tex will typically look like

% file: main.tex
\documentclass{report}
\begin{document}

\input{abstract.tex}
\input{intro/intro.tex}
\input{chapter1/chap1.tex}
\input{conclusion/conclusion.tex}

\end{document}

In such situations, you will need to convey to Latex-Suite that main.tex is the main file which \inputs the other files. This is done by creating an empty file called main.tex.latexmain in the same directory in which main.tex resides. This file is called the master file in this manual. See Tex_MainFileExpression for an alternative way of specifying the master file.

### Note

Here main.tex.latexmain is (obviously) a different file from main.tex itself. main.tex need not be renamed. This ofcourse restricts each directory to have a single master file.

Each time Latex-Suite opens a new LaTeX file, it will try to see if it is part of a multiple file project by searching upwards (to the root of the file-system) from the current file's directory to see if it finds a file of the form *.latexmain. If such a file is found, then it is considered that the current file is part of a larger project. The name of the LaTeX master file is inferred directly from the first part of the *.latexmain file as described in the example above.

### 9.1 Latex-Suite project settings

If a master file is found, then Latex-Suite :sources the file. Thus this file needs to contain valid Vim commands. This file is typically used to store project specific settings.

Some typical per-project settings which are best put in the master file are

 Tex_ProjectSourceFiles

### 9.2 Specifying which file to compile

In the example described previously, if you are editing intro/intro.tex and press \ll, then you still want Latex-Suite to compile main.tex, because intro/intro.tex is merely a fragment which is \input'ed into main.tex. If the master file is already specified using the *.latexmain convention described previously, then Latex-Suite will automatically compile the master file when you are editing any of its \input'ed fragments. Thus pressing \ll while editing intro/intro.tex will compile main.tex.

If you wish to use some different logic to specify the main file name, you can specify a custom expression via the Tex_MainFileExpression variable. This is a string containing a valid vim expression. In addition, you can use a variable modifier which is in the format used for |filename-modifiers|, for example, ':p:h'. You should utilize this variable to modify the filename of the main file.

let g:Tex_MainFileExpression = 'MainFile(modifier)'
function! MainFile(fmod)
if glob('*.latexmain') != ''
return fnamemodify(glob('*.latexmain'), a:fmod)
else
return ''
endif
endif

## 10 Latex-Suite Commands and Maps

This section describes the maps and commands used in Latex-Suite. It also describes a way to change the map sequences according to your preference.

### 10.1 Latex-Suite Maps

Most of the mappings used in Latex-Suite can be mapped to a different key combination to suit your particular needs. An example best explains the procedure for doing this. Suppose you want to remap the <C-j> key which Latex-Suite (actually imaps.vim) uses to jump to the next placeholder. To do this, you first need to find out which <Plug> mapping <C-j> is derived from. You will need to look at the relevant section of this manual to do this. For example, the section IMAP mappings has the information that the <C-j> key is derived from <Plug>IMAP_JumpForward. Therefore to remap the <C-j> key to say <C-space>, you will need to put a statement like the following in your ~/.vimrc.

imap <C-space> <Plug>IMAP_JumpForward

### Note

To change the IMAP mappings which affect jumping between placeholders, the map statement above has to be placed in your ~/.vimrc. For other mappings you can place the map statement in your $VIM/ftplugin/tex.vim file. The reason for this is that the <C-j> maps are created in plugin/imaps.vim, which is sourced as soon as Vim starts before sourcing any ftplugin files. #### 10.1.1 IMAP mappings These mappings are utilized for jumping between placeholders as described here. See the parent section to find out how to use this information to change the default maps. Plug mapDefault Key <Plug>IMAP_JumpForward<C-j> <Plug>IMAP_JumpBack(none) <Plug>IMAP_DeleteAndJumpForward(none) <Plug>IMAP_DeleteAndJumpBack(none) <Plug>IMAP_JumpForward takes you to the location of the next place-holder. <Plug>IMAP_JumpBack takes you to the previous place-holder. <Plug>IMAP_DeleteAndJumpForward deletes the presently selected place-holder and jumps to the next place-holder irrespective of whether the present placeholder is empty or not and ignoring the value of place-holder settings like g:Imap_DeleteEmptyPlaceHolders and g:Imap_StickyPlaceHolders <Plug>IMAP_DeleteAndJumpBack deletes the presently selected place-holder and jumps to the previous place-holder irrespective of whether the present placeholder is empty or not and ignoring the value of place-holder settings like g:Imap_DeleteEmptyPlaceHolders and g:Imap_StickyPlaceHolders #### 10.1.2 Alt-Key mappings These mappings are are described in the section Alt key macros. See the parent section to see how to use the following information to remap keys. Plug MappingDefault Key <Plug>Tex_MathBF<Alt-B> <Plug>Tex_MathCal<Alt-C> <Plug>Tex_LeftRight<Alt-L> <Plug>Tex_InsertItemOnThisLine<Alt-I> ### 10.2 Latex Suite Commands #### 10.2.1 :TMacro [{macro}] When used without any arguments lists all available macros defined in runtime ftplugin/latex-suite/macros/ directories and prompts you to choose one of them. With one argument |:read| this macro under cursor position. With more than one argument it will not work :) In Vim >= 6.2 works completion of names of macros (see 'wildmenu', 'wildmode' for more about command-line completion). #### 10.2.2 :TMacroEdit [{macro}] Splits window for editing {macro}. When used without any arguments lists all available macros defined in runtime ftplugin/latex-suite/macros/ directories and prompt you to choose one of them. When you try to edit {macro} not from local directory Latex-Suite will copy it to your local directory with suffix "-local". If local copy already exists Latex-Suite prompt for overwriting it. In Vim >= 6.2 works completion of names of macros (see 'wildmenu', 'wildmode' for more about command-line completion). #### 10.2.3 :TMacroNew Splits window to write new macro. Directory in new buffer is locally changed to Latex-Suite/macros/. #### 10.2.4 :TMacroDelete [{macro}] Delets {macro} from your local ftplugin/latex-suite/macros/ directory. When used without any arguments lists all available macros defined in Latex-Suite/macros/ directory and prompt you to choose one of them. When you choose to delete {macro} which is not in your local directory Latex-Suite will refuse to delete it. In Vim >= 6.2 works completion of names of macros (see 'wildmenu', 'wildmode' for more about command-line completion) #### 10.2.5 :TPackage [{package, ...}] When used without any arguments lists name of the packages for which support is available. If you are using Vim GUI and have Tex_Menus set to 1, then it will list all files found in the $VIM/ftplugin/latex-suite/packages directory. Otherwise, Latex-Suite will list files found in the $VIM/ftplugin/latex-suite/dictionaries directory. Choosing a file from the list will insert a \usepackage[<++>]{<packname>} line into the buffer at the current cursor location. For Vim 6.2 and above, you can use command-line completion to choose a package file. You can also call TPackage with one or more package names separated with spaces in which case, Latex-Suite will insert \usepackage lines for each of them in turn. After inserting the \usepackage line(s), Latex-Suite will support it (them) in various ways as described in the section Actions taken for supported packages. #### 10.2.6 :TPackageUpdate This command reads' name of package under cursor and turns on possible support. #### 10.2.7 :TPackageUpdateAll After issuing this command latexSuite scans the file in looking for not declared packages, removing not needed entries from Packages menu and turning off not necessary packages' dictionaries. #### 10.2.8 :TTemplate [{template}] When used without any arguments lists all available templates from latex-suite/templates/ directory and prompts to choose one of them. With one argument :0|read| {template} file. With more than one argument it will not work :) In Vim >= 6.2 works completion of names of macros (see 'wildmenu', 'wildmode' for more about command-line completion) #### 10.2.9 :TSection [{argument}] Used without any arguments inserts last section type (|latex-sectioning|). Accepts arguments: n> inserts section name in <n> logical level. Levels are:  0 part 1 chapter 2 section 3 subsection 4 subsubsection 5 paragraph 6 subparagraph  + inserts section name logical levels above the last used comand - inserts section name logical levels below the last used comand + inserts section name one logical level below the last used command (equal to +1). ++ inserts section name two logical levels below the last used command (equal to +2). - inserts section name one logical level over the last used command (equal to -1). -- inserts section name two logical levels over the last used command (equal to -2). Command accepts also latexSuite mappings (|latex-macros|) without preceding S and in lowercase: :TSection pa will result in \part{}. It is possible to use full names of sections: :TSection part #### 10.2.10 :TSectionAdvanced Accepts the same arguments as |TSection| but leads to a couple of questions (whether you want to include the section in the table of contents, whether there is a shorter name for the table of contents) and then creates a more intelligent template. #### 10.2.11 :TLook Accepts one argument. Will look through .tex files in directory of edited file for argument. It can be regexp. You don't have to enclose argument in "". <cr> takes you to location. Other keys work as described in |latex-viewer|. Note: TLook uses :grep command and is using 'grepprg'. Its regular expressions can be different from those of Vim. #### 10.2.12 :TLookBib Accepts one argument. Will look through .bib files in directory of edited file for argument. It can be regexp. You don't have to enclose argument in "". <cr> takes you to location. Other keys work as described in |latex-viewer|. ### Note TLookBib uses :grep command and is using 'grepprg'. Its regular expressions can be different from those of Vim. #### 10.2.13 :TLookAll Accepts one argument. Will look through all files in directory of edited file for argument. It can be regexp. You don't have to enclose argument in "". <cr> takes you to location. Other keys work as described in |latex-viewer|. Note: TLook uses :grep command and is using 'grepprg'. Its regular expressions can be different from those of Vim. #### 10.2.14 :TPartComp No argument allowed but accepts range in all formats. Define fragment of interest with :'a,'b, :/a/,/b/, :'<,'> or :20,30. All other rules of compilation apply. #### 10.2.15 :TPartView Show last compiled fragment. All rules of viewing apply but |latex-searching|. #### 10.2.16 :Tshortcuts [{arg}] Show shortcuts in terminal (not using menu). Without {arg} you will see simple menu prompting for one of them. Possible arguments:  g General shortcuts e Environment shortcuts f Font shortcuts s Section shortcuts m Math shortcuts a All shortcuts ## 11 Customizing Latex-Suite Customizing Latex-Suite is done by defining certain global variables in $VIM/ftplugin/tex.vim, where $VIM corresponds to ~/.vim for *nix machines and ~/vimfiles for windows machines. This file is not part of the Latex-Suite distribution. You will need to create this file yourself (or modify it if it exists) if you need to change any default settings. Since this file is not included as part of the Latex-Suite distribution, it will not be over-written in subsequent updates. The default settings in Latex-Suite are defined in $VIM/ftplugin/latex-suite/texrc. Please take a look at this file if you find this documentation incomplete or confusing. That file is also well documented.

This chapter describes the various settings which effect Latex-Suite and their default values. The settings are broken up into sections according to the behavior which they influence.

### 11.1 General Settings

#### 11.1.1 Tex_Debug

 Type boolean Default Value 0

If set to 1, then Latex-Suite will create certain global debug statements which can be printed by doing

:call Tex_PrintDebug()

#### 11.1.2 Tex_UsePython

 Type boolean Default Value 1

If Latex-Suite detects that your vim is python enabled (using has('python') and has('python3')), then it tries to use python in certain places to speed things up. If this misbehaves, you can set this to zero, in which case, Latex-Suite will use vimscript to accomplish the same.

### 11.2 Place-Holder Customization

Latex-Suite uses place-holders to minimize using the movement keys while typing. The following settings affect how place-holders are used.

### 11.5 Latex Completion Customization

The following settings affect the completion functionality in Latex-Suite.

#### 11.5.1 Window size settings

These three settings affect the aesthetics of the completion functionality.

SettingExplanationDefault Value
g:Tex_ViewerCwindowHeightThe height of the cwindow which displays the list of \labels etc.5
g:Tex_ViewerPreviewHeightThe height of the preview window which shows the context of a \label etc.10
g:Tex_ExplorerHeightThe height of the explorer window which lists the files from which to choose an image file.10
g:Tex_ImageDirThe directory to scan for images''

#### 11.5.2 g:Tex_BIBINPUTS

 Type string Default Value ''

This string describes the directories which are scanned while trying to search for .bib and .bbl files. See the cite completion section for more details.

This string should be set in the syntax accepted by Vim's native 'path' setting. Do not include the present directory '.'. While searching for bibliography files, the present directory will be prepended to this variable.

#### 11.5.3 Tex_UseOutlineCompletion

When set to 1 (default), Latex-Suite searches for \labels in all .tex files of your project, starting with the main file when <F9> is pressed. See \ref completion for details.

#### 11.5.4 Tex_UseSimpleLabelSearch

When set to 1 and if Tex_UseOutlineCompletion is 0, Latex-Suite searches for \labels in all .tex files in the directory containing the file being edited when <F9> is pressed. See \ref completion for details.

#### 11.5.5 g:Tex_ProjectSourceFiles

 Type String Default Value ''

This setting is meant to be initialized on a per-project basis using the Latex-Suite master file as described in Latex-Suite Project section. It is a list of source files which are used in the project. If defined, then instead of using the logic described in Tex_UseSimpleLabelSearch to search for files in which to search for \labels, we simply search for \labels in this list. This significantly reduces the time it takes to generate the list of possible completions for large projects.

The list is specified as a whitespace separated list of filenames relative to the location of the main file.

#### 11.5.6 Tex_UseCiteCompletionVer2

When set to 1 (default), Latex-Suite uses python to parse your bib-file. See \cite completion for details.

#### 11.5.7 g:Tex_RememberCiteSearch

 Type Boolean Default Value 0

When this variable is non-zero, then Latex-Suite will try to remember results from the \cite completion. This is only used if Tex_UseCiteCompletionVer2 is set to 0.

### 11.6 Compiler Customization

The following settings affect Latex-Suite's compilation functionality

#### 11.6.1 g:Tex_DefaultTargetFormat

 Type String Default Value dvi for windows/*nix and pdf for mac

Use this setting to choose the default target format. For example, setting this to pdf makes Latex-Suite compile a pdf file when you press \ll and fire up the pdf viewer on pressing \lv. Make sure that a rules for compiling and viewing have been defined for this target format as described here and here.

#### 11.6.2 g:Tex_CompileRule_<format>

Here <format> refers to the target format for which this rule is defined. Latex-Suite supports compiling into dvi, ps and pdf by default. All these rules are strings defined by default as follows:

### Default Viewing Format

To change the default format for viewing files, set the g:Tex_DefaultTargetFormat variable.

#### 11.7.2 Tex_ViewRuleComplete_<format>

Here <format> refers to the extension of a output format such as dvi, html etc.

Tex_ViewRuleComplete_format takes precedence over Tex_ViewRule_format if both are specified. By default, Latex-Suite does not define values for Tex_ViewRuleComplete_format for any format. Unlike in the case of Tex_ViewRule_format, Latex-Suite does not modify Tex_ViewRuleComplete_format at all in constructing the command line. The only modification is to substitute '$*' everywhere in the string with the name of the file being viewed (without the extension). ### IMPORTANT Make sure you make the process go into the background otherwise vim will wait for the viewer to terminate before letting you edit the file again. To make a process go into the background on a *nix platform, use a trailing & in the setting. On Windows, use start at the beginning of the setting. Example: Suppose you have a latex->html converter which converts a file say foo.tex to a file foo/index.html. Then you would use: " On *nix platform let g:Tex_ViewRuleComplete_html = 'MozillaFirebird$*/index.html &'
" On windows platform

## 12 Credits

And finally, the credits:

 Artur R. Czechowski maintains the BSD package of Latex-Suite. Lots of valuable feedback. Lubomir Host provided the diacritics and also helped in development. Alexander Wagner valuable suggestions during development. Luc Hermitte his variation of Stephen Riehm's bracketing system is used in Latex-Suite. Gergely Kontra the clever little JumpFunc() in imaps.vim is due to him. The implementation of the templates also borrows from mu-template.vim by him. Dimitri Antoniou author of ltags and also provided the nice tip about forward / reverse search on DVI documents. Stephen Riehm the extremely helpful bracketing system is from him. Alan Schmitt provided macros/folding elements. Continued feedback, bug-reports/fixes. Hari Krishna Dara for ExecMap(), the clever little function which makes typing visual mode mappings so much easier and error-free. Alan G Isac for the comprehensive BibT() function for entering bibtex entries. Gontran Baerts for libList.vim Peter Heslin useful discussion and also a lot of bug fixes. the %%fakesection in folding.vim. Zhang Lin-bo lots of very useful additions to folding. The code for customizing the folding scheme is due to him.

A large number of functions in Latex-Suite come from various other people. Some of those people might have been missed here. Each function should however have the author's name/e-mail above it. Thats the more authoritative place to check out who has done what.

The current maintainer(s) of Latex-Suite is(are)

 Srinath Avadhanula Mikolaj Machowski Benji Fisher