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Diffstat (limited to 'book/src/guides')
| -rw-r--r-- | book/src/guides/adding_languages.md | 97 |
1 files changed, 58 insertions, 39 deletions
diff --git a/book/src/guides/adding_languages.md b/book/src/guides/adding_languages.md index 5844a48e..51256288 100644 --- a/book/src/guides/adding_languages.md +++ b/book/src/guides/adding_languages.md @@ -1,45 +1,68 @@ # Adding languages -## Submodules +## Language configuration -To add a new language, you should first add a tree-sitter submodule. To do this, -you can run the command -```sh -git submodule add -f <repository> helix-syntax/languages/tree-sitter-<name> -``` -For example, to add tree-sitter-ocaml you would run -```sh -git submodule add -f https://github.com/tree-sitter/tree-sitter-ocaml helix-syntax/languages/tree-sitter-ocaml +To add a new language, you need to add a `language` entry to the +[`languages.toml`][languages.toml] found in the root of the repository; +this `languages.toml` file is included at compilation time, and is +distinct from the `languages.toml` file in the user's [configuration +directory](../configuration.md). + +```toml +[[language]] +name = "mylang" +scope = "scope.mylang" +injection-regex = "^mylang$" +file-types = ["mylang", "myl"] +comment-token = "#" +indent = { tab-width = 2, unit = " " } ``` -Make sure the submodule is shallow by doing -```sh -git config -f .gitmodules submodule.helix-syntax/languages/tree-sitter-<name>.shallow true + +These are the available keys and descriptions for the file. + +| Key | Description | +| ---- | ----------- | +| `name` | The name of the language | +| `scope` | A string like `source.js` that identifies the language. Currently, we strive to match the scope names used by popular TextMate grammars and by the Linguist library. Usually `source.<name>` or `text.<name>` in case of markup languages | +| `injection-regex` | regex pattern that will be tested against a language name in order to determine whether this language should be used for a potential [language injection][treesitter-language-injection] site. | +| `file-types` | The filetypes of the language, for example `["yml", "yaml"]`. Extensions and full file names are supported. | +| `shebangs` | The interpreters from the shebang line, for example `["sh", "bash"]` | +| `roots` | A set of marker files to look for when trying to find the workspace root. For example `Cargo.lock`, `yarn.lock` | +| `auto-format` | Whether to autoformat this language when saving | +| `diagnostic-severity` | Minimal severity of diagnostic for it to be displayed. (Allowed values: `Error`, `Warning`, `Info`, `Hint`) | +| `comment-token` | The token to use as a comment-token | +| `indent` | The indent to use. Has sub keys `tab-width` and `unit` | +| `config` | Language server configuration | +| `grammar` | The tree-sitter grammar to use (defaults to the value of `name`) | + +## Grammar configuration + +If a tree-sitter grammar is available for the language, add a new `grammar` +entry to `languages.toml`. + +```toml +[[grammar]] +name = "mylang" +source = { git = "https://github.com/example/mylang", rev = "a250c4582510ff34767ec3b7dcdd3c24e8c8aa68" } ``` -or you can manually add `shallow = true` to `.gitmodules`. +Grammar configuration takes these keys: -## languages.toml +| Key | Description | +| --- | ----------- | +| `name` | The name of the tree-sitter grammar | +| `path` | A path within the grammar directory which should be built. Some grammar repositories host multiple grammars (for example `tree-sitter-typescript` and `tree-sitter-ocaml`) in subdirectories. This key is used to point `hx --build-grammars` to the correct path for compilation. When ommitted, the root of the grammar directory is used | +| `source` | The method of fetching the grammar - a table with a schema defined below | -Next, you need to add the language to the [`languages.toml`][languages.toml] found in the root of -the repository; this `languages.toml` file is included at compilation time, and -is distinct from the `language.toml` file in the user's [configuration -directory](../configuration.md). +Where `source` is a table with either these keys when using a grammar from a +git repository: -These are the available keys and descriptions for the file. +| Key | Description | +| --- | ----------- | +| `git` | A git remote URL from which the grammar should be cloned | +| `rev` | The revision (commit hash or tag) which should be fetched | -| Key | Description | -| ---- | ----------- | -| name | The name of the language | -| scope | A string like `source.js` that identifies the language. Currently, we strive to match the scope names used by popular TextMate grammars and by the Linguist library. Usually `source.<name>` or `text.<name>` in case of markup languages | -| injection-regex | regex pattern that will be tested against a language name in order to determine whether this language should be used for a potential [language injection][treesitter-language-injection] site. | -| file-types | The filetypes of the language, for example `["yml", "yaml"]` | -| shebangs | The interpreters from the shebang line, for example `["sh", "bash"]` | -| roots | A set of marker files to look for when trying to find the workspace root. For example `Cargo.lock`, `yarn.lock` | -| auto-format | Whether to autoformat this language when saving | -| diagnostic-severity | Minimal severity of diagnostic for it to be displayed. (Allowed values: `Error`, `Warning`, `Info`, `Hint`) | -| comment-token | The token to use as a comment-token | -| indent | The indent to use. Has sub keys `tab-width` and `unit` | -| config | Language server configuration | +Or a `path` key with an absolute path to a locally available grammar directory. ## Queries @@ -51,18 +74,14 @@ gives more info on how to write queries. > NOTE: When evaluating queries, the first matching query takes precedence, which is different from other editors like neovim where -the last matching query supercedes the ones before it. See +the last matching query supersedes the ones before it. See [this issue][neovim-query-precedence] for an example. ## Common Issues -- If you get errors when building after switching branches, you may have to remove or update tree-sitter submodules. You can update submodules by running - ```sh - git submodule sync; git submodule update --init - ``` -- Make sure to not use the `--remote` flag. To remove submodules look inside the `.gitmodules` and remove directories that are not present inside of it. +- If you get errors when running after switching branches, you may have to update the tree-sitter grammars. Run `hx --fetch-grammars` to fetch the grammars and `hx --build-grammars` to build any out-of-date grammars. -- If a parser is segfaulting or you want to remove the parser, make sure to remove the submodule *and* the compiled parser in `runtime/grammar/<name>.so` +- If a parser is segfaulting or you want to remove the parser, make sure to remove the compiled parser in `runtime/grammar/<name>.so` - The indents query is `indents.toml`, *not* `indents.scm`. See [this](https://github.com/helix-editor/helix/issues/114) issue for more information. |