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< ol class = "chapter" > < li class = "chapter-item expanded affix " > < a href = "../title-page.html" > Helix< / a > < / li > < li class = "chapter-item expanded " > < a href = "../install.html" > < strong aria-hidden = "true" > 1.< / strong > Installation< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../package-managers.html" > < strong aria-hidden = "true" > 1.1.< / strong > Package Managers< / a > < / li > < li class = "chapter-item expanded " > < a href = "../building-from-source.html" > < strong aria-hidden = "true" > 1.2.< / strong > Building from source< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../usage.html" > < strong aria-hidden = "true" > 2.< / strong > Usage< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../registers.html" > < strong aria-hidden = "true" > 2.1.< / strong > Registers< / a > < / li > < li class = "chapter-item expanded " > < a href = "../surround.html" > < strong aria-hidden = "true" > 2.2.< / strong > Surround< / a > < / li > < li class = "chapter-item expanded " > < a href = "../textobjects.html" > < strong aria-hidden = "true" > 2.3.< / strong > Textobjects< / a > < / li > < li class = "chapter-item expanded " > < a href = "../syntax-aware-motions.html" > < strong aria-hidden = "true" > 2.4.< / strong > Syntax aware motions< / a > < / li > < li class = "chapter-item expanded " > < a href = "../keymap.html" > < strong aria-hidden = "true" > 2.5.< / strong > Keymap< / a > < / li > < li class = "chapter-item expanded " > < a href = "../commands.html" > < strong aria-hidden = "true" > 2.6.< / strong > Commands< / a > < / li > < li class = "chapter-item expanded " > < a href = "../lang-support.html" > < strong aria-hidden = "true" > 2.7.< / strong > Language support< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../from-vim.html" > < strong aria-hidden = "true" > 3.< / strong > Migrating from Vim< / a > < / li > < li class = "chapter-item expanded " > < a href = "../configuration.html" > < strong aria-hidden = "true" > 4.< / strong > Configuration< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../editor.html" > < strong aria-hidden = "true" > 4.1.< / strong > Editor< / a > < / li > < li class = "chapter-item expanded " > < a href = "../themes.html" > < strong aria-hidden = "true" > 4.2.< / strong > Themes< / a > < / li > < li class = "chapter-item expanded " > < a href = "../remapping.html" > < strong aria-hidden = "true" > 4.3.< / strong > Key remapping< / a > < / li > < li class = "chapter-item expanded " > < a href = "../languages.html" > < strong aria-hidden = "true" > 4.4.< / strong > Languages< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../guides/index.html" > < strong aria-hidden = "true" > 5.< / strong > Guides< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../guides/adding_languages.html" class = "active" > < strong aria-hidden = "true" > 5.1.< / strong > Adding languages< / a > < / li > < li class = "chapter-item expanded " > < a href = "../guides/textobject.html" > < strong aria-hidden = "true" > 5.2.< / strong > Adding textobject queries< / a > < / li > < li class = "chapter-item expanded " > < a href = "../guides/indent.html" > < strong aria-hidden = "true" > 5.3.< / strong > Adding indent queries< / a > < / li > < li class = "chapter-item expanded " > < a href = "../guides/injection.html" > < strong aria-hidden = "true" > 5.4.< / strong > Adding injection queries< / a > < / li > < / ol > < / li > < / ol >
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< h2 id = "adding-new-languages-to-helix" > < a class = "header" href = "#adding-new-languages-to-helix" > Adding new languages to Helix< / a > < / h2 >
< p > In order to add a new language to Helix, you will need to follow the steps
below.< / p >
< h2 id = "language-configuration" > < a class = "header" href = "#language-configuration" > Language configuration< / a > < / h2 >
< ol >
< li > Add a new < code > [[language]]< / code > entry in the < code > languages.toml< / code > file and provide the
necessary configuration for the new language. For more information on
language configuration, refer to the
< a href = "../languages.html" > language configuration section< / a > of the documentation.
A new language server can be added by extending the < code > [language-server]< / code > table in the same file.< / li >
< li > If you are adding a new language or updating an existing language server
configuration, run the command < code > cargo xtask docgen< / code > to update the
< a href = "../lang-support.html" > Language Support< / a > documentation.< / li >
< / ol >
< blockquote >
< p > 💡 If you are adding a new Language Server configuration, make sure to update
the
< a href = "https://github.com/helix-editor/helix/wiki/Language-Server-Configurations" > Language Server Wiki< / a >
with the installation instructions.< / p >
< / blockquote >
< h2 id = "grammar-configuration" > < a class = "header" href = "#grammar-configuration" > Grammar configuration< / a > < / h2 >
< ol >
< li > If a tree-sitter grammar is available for the new language, add a new
< code > [[grammar]]< / code > entry to the < code > languages.toml< / code > file.< / li >
< li > If you are testing the grammar locally, you can use the < code > source.path< / code > key
with an absolute path to the grammar. However, before submitting a pull
request, make sure to switch to using < code > source.git< / code > .< / li >
< / ol >
< h2 id = "queries" > < a class = "header" href = "#queries" > Queries< / a > < / h2 >
< ol >
< li > In order to provide syntax highlighting and indentation for the new language,
you will need to add queries.< / li >
< li > Create a new directory for the language with the path
< code > runtime/queries/< name> /< / code > .< / li >
< li > Refer to the
< a href = "https://tree-sitter.github.io/tree-sitter/syntax-highlighting#queries" > tree-sitter website< / a >
for more information on writing queries.< / li >
< li > A list of highlight captures can be found < a href = "https://docs.helix-editor.com/themes.html#scopes" > on the themes page< / a > .< / li >
< / ol >
< blockquote >
< p > 💡 In Helix, the first matching query takes precedence when evaluating
queries, which is different from other editors such as Neovim where the last
matching query supersedes the ones before it. See
< a href = "https://github.com/helix-editor/helix/pull/1170#issuecomment-997294090" > this issue< / a >
for an example.< / p >
< / blockquote >
< h2 id = "common-issues" > < a class = "header" href = "#common-issues" > Common issues< / a > < / h2 >
< ul >
< li > If you encounter errors when running Helix after switching branches, you may
need to update the tree-sitter grammars. Run the command < code > hx --grammar fetch< / code >
to fetch the grammars and < code > hx --grammar build< / code > to build any out-of-date
grammars.< / li >
< li > If a parser is causing a segfault, or you want to remove it, make sure to
remove the compiled parser located at < code > runtime/grammars/< name> .so< / code > .< / li >
< li > If you are attempting to add queries and Helix is unable to locate them, ensure that the environment variable < code > HELIX_RUNTIME< / code > is set to the location of the < code > runtime< / code > folder you're developing in.< / li >
< / ul >
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