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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 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 = "../keymap.html" > < strong aria-hidden = "true" > 2.1.< / strong > Keymap< / a > < / li > < li class = "chapter-item expanded " > < a href = "../commands.html" > < strong aria-hidden = "true" > 2.2.< / strong > Commands< / a > < / li > < li class = "chapter-item expanded " > < a href = "../lang-support.html" > < strong aria-hidden = "true" > 2.3.< / 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 = "../themes.html" > < strong aria-hidden = "true" > 4.1.< / strong > Themes< / a > < / li > < li class = "chapter-item expanded " > < a href = "../remapping.html" > < strong aria-hidden = "true" > 4.2.< / strong > Key Remapping< / a > < / li > < li class = "chapter-item expanded " > < a href = "../languages.html" > < strong aria-hidden = "true" > 4.3.< / 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 > < / ol > < / li > < / ol >
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< h1 id = "adding-languages" > < a class = "header" href = "#adding-languages" > Adding languages< / a > < / h1 >
< h2 id = "language-configuration" > < a class = "header" href = "#language-configuration" > Language configuration< / a > < / h2 >
< p > To add a new language, you need to add a < code > [[language]]< / code > entry to the
< code > languages.toml< / code > (see the < a href = "../languages.html" > language configuration section< / a > ).< / p >
< p > When adding a new language or Language Server configuration for an existing
language, run < code > cargo xtask docgen< / code > to add the new configuration to the
< a href = "../lang-support.html" > Language Support< / a > docs before creating a pull request.
When adding a Language Server configuration, be sure to update the
< a href = "https://github.com/helix-editor/helix/wiki/How-to-install-the-default-language-servers" > Language Server Wiki< / a > with installation notes.< / p >
< h2 id = "grammar-configuration" > < a class = "header" href = "#grammar-configuration" > Grammar configuration< / a > < / h2 >
< p > If a tree-sitter grammar is available for the language, add a new < code > [[grammar]]< / code >
entry to < code > languages.toml< / code > .< / p >
< p > You may use the < code > source.path< / code > key rather than < code > source.git< / code > with an absolute path
to a locally available grammar for testing, but switch to < code > source.git< / code > before
submitting a pull request.< / p >
< h2 id = "queries" > < a class = "header" href = "#queries" > Queries< / a > < / h2 >
< p > For a language to have syntax-highlighting and indentation among
other things, you have to add queries. Add a directory for your
language with the path < code > runtime/queries/< name> /< / code > . The tree-sitter
< a href = "https://tree-sitter.github.io/tree-sitter/syntax-highlighting#queries" > website< / a >
gives more info on how to write queries.< / p >
< blockquote >
< p > NOTE: When evaluating queries, the first matching query takes
precedence, which is different from other editors like 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 >
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< p > If you get errors when running after switching branches, you may have to update the tree-sitter grammars. Run < code > hx --grammar fetch< / code > to fetch the grammars and < code > hx --grammar build< / code > to build any out-of-date grammars.< / p >
< / li >
< li >
< p > If a parser is segfaulting or you want to remove the parser, make sure to remove the compiled parser in < code > runtime/grammar/< name> .so< / code > < / p >
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