Vim support for Julia.
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README.md

julia-vim

julia-vim logo

Julia support for Vim.

INSTALLATION INSTRUCTIONS

Complete documentation

The full documentation is available from Vim: after installation, you just need to type :help julia-vim.

The remainder of this README will only give an overview of some of the features:

LaTeX-to-Unicode substitutions

This plug-in adds some functionality to substitute LaTeX code sequences (e.g. \alpha) with corresponding Unicode symbols (e.g. α). By default, these substitutions must be triggered explicitly by pressing the Tab key, as in the Julia command line (the REPL); however, an automatic, as-you-type mode can also be activated.

On the Vim command line, the feature is activated by pressing Shift-Tab. This is mostly useful when searching the files with the / or ? commands.

By default, this feature is only active when editing Julia files. However, it can be also enabled with other file types, and even turned on/off on the fly regardless of the file type.

These features only work as described with Vim version 7.4 or higher. Tab completion can still be made available on lower Vim versions, see below for more details.

The following sections provide details on these features. The complete documentation is provided by calling :help julia-vim from within Vim. A complete reference table of the available substitution can be accessed by calling :help L2U-ref from within Vim.

LaTeX-to-Unicode via Tab key

This plug-in adds a mapping to the Tab key which makes it behave like the Julia REPL, i.e. when the cursor is at the end of a recognized LaTeX symbol (e.g. \alpha) in insert mode, pressing the Tab key will substitute it with the corresponding Unicode symbol (e.g. α). If a partial match is found (e.g. \al), a list of possible completions is suggested (e.g. \aleph, \allequal, \alpha), and it will be refined while you enter more characters; when only one match is left, pressing Tab will complete it and pressing it again will perform the substitution to Unicode.

If no suitable substitution is found, the action will fall back to whatever mapping was previously defined: by default, inserting a literal <Tab> character, or invoking some other action if another plug-in is installed, e.g. supertab or YouCompleteMe.

Note that the YouCompleteMe, neocomplcache, neocomplete and deoplete plug-ins do not work well with the suggestion of possible completions for partial matches, and therefore this feature is disabled if those plug-ins are detected.

A literal tab can always be forced by using CTRL-V and then Tab.

On the Vim command line, e.g. when searching the file with the / or ? commands, the feature is activated by Shift-Tab.

To disable this mapping, you can use the command :let g:latex_to_unicode_tab = 0, e.g. by putting it into your .vimrc file. You can also change this setting from the Vim command-line, but you will also need to give the command :call LaTeXtoUnicode#Init() for the change to take effect.

Even when the mapping is disabled, the feature is still available via the omnicompletion mechanism, i.e. by pressing CTRL-X and then CTRL-O.

To disable the suggestions of partial matches completions, use the command :let g:latex_to_unicode_suggestions = 0.

In general, suggestions try not to get in the way, and so if an exact match is detected (e.g. \ne) when Tab is pressed, the substitution will be done even when there would be other symbols with the same prefix (e.g. \neg). This behaviour can be changed by the command :let g:latex_to_unicode_eager = 0, in which case hitting Tab will first produce a suggestion list, and only pressing it again will trigger the substitution to Unicode.

Using this feature on Vim versions lower than 7.4

The automatic remapping of the Tab key is not performed if Vim version is lower than 7.4. However, the functionality can still be used via the omnicompletion mechanism, i.e. by using CTRL-XCTRL-O. You can map this to some more convenient key combination, e.g. you may want to add something like this line to your .vimrc file:

inoremap <C-Tab> <C-X><C-O>

This would map the functionality to CTRL-Tab. However, if you try to map this to Tab, you'd only be able to use literal Tab by using CTRL-VTab.

LaTeX-to-Unicode as you type

An automatic substitution mode can be activated by using the command :let g:latex_to_unicode_auto = 1, e.g. by putting it into your .vimrc file. You can also change this setting from the Vim command-line, but you will also need to give the command :call LaTeXtoUnicode#Init() for the change to take effect.

In this mode, symbols will be substituted as you type, as soon as some extra character appears after the symbol and a LaTeX sequence can unambiguously be identified.

For example, if you type a \neq b the \neq will be changed to right after the space, before you input the b.

This does not interfere with the Tab mapping discussed above.

The g:latex_to_unicode_auto setting can also be changed from the Vim command-line, but you will also need to give the command :call LaTeXtoUnicode#Init() for the change to take effect.

This feature is not available with Vim versions lower then 7.4.

LaTeX-to-Unicode on other file types

By default, the LaTeX-to-Unicode substitutions are only active when editing Julia files. However, you can use the variable g:latex_to_unicode_file_types to specify for which file types this feature is active by default. The variable must be set to a string containing a pattern (a regular expression) which matches the desired file types, or to a list of such patterns. For example, to activate the feature on all file types, you could put let g:latex_to_unicode_file_types = ".*" in your .vimrc file. Be aware, however, that enabling the functionality overrides the omnifunc setting for that file type.

Enabling and disabling the LaTeX-to-Unicode functionality

Regardless of the type of the file you are editing and of the g:latex_to_unicode_file_types setting, the LaTeX-to-Unicode substitutions can be enabled/disabled/toggled by calling the functions LaTeXtoUnicode#Enable(), LaTeXtoUnicode#Disable(), LaTeXtoUnicode#Toggle(). For example, you could use the mappings:

noremap <expr> <F7> LaTeXtoUnicode#Toggle()
inoremap <expr> <F7> LaTeXtoUnicode#Toggle()

and then use the F7 key to quickly turn the feature on and off.

Block-wise movements and block text-objects

This plug-in defines mappings to move around julia blocks (e.g. if/end, function/end etc.) and to manipulate them as a whole (analogously to the standard w, b etc. commands to move on words, and to the aw, iw commands which allow to manipulate them). These require the matchit plugin, which is usually distributed with ViM but must be explicitly enabled, e.g. adding this to your .vimrc file:

runtime macros/matchit.vim

The default mappings use ]], ][, [[, [], ]j, ]J, [j, and [J for the movements and aj, ij for the selections. These can be disabled collectively by setting g:julia_blocks to 0, or they can be remapped and/or disabled individually by defining a g:julia_blocks_mapping variable. See the documentation for details.

Note that this feature requires Vim version 7.4 or higher.

Changing syntax highlighting depending on the Julia version

The plugin supports syntax highlighting different versions of Julia. By default, the highlighting scheme assumes the latest stable release of Julia (currently, version 1.0; the plugin does not differentiate between 0.7 and 1.0), but the previous one and the latest version under development are also supported. You can set a global default in your .vimrc, e.g. if you follow Julia's master you can use:

let g:default_julia_version = "devel"

or if you are still using Julia 0.6 you can use:

let g:default_julia_version = "0.6"

You can also switch version for a particular buffer, by using the julia#set_syntax_version() function, e.g. by typing in Vim:

:call julia#set_syntax_version("0.6")