Add support for Purescript language (helix-editor#4242)

Author: dariooddenino

book/src/generated/lang-support.md

@@ -86,6 +86,7 @@
 | prisma | ✓ |  |  | `prisma-language-server` |
 | prolog |  |  |  | `swipl` |
 | protobuf | ✓ |  | ✓ |  |
+| purescript | ✓ |  |  | `purescript-language-server` |
 | python | ✓ | ✓ | ✓ | `pylsp` |
 | r | ✓ |  |  | `R` |
 | racket |  |  |  | `racket` |

languages.toml

@@ -723,6 +723,19 @@ indent = { tab-width = 2, unit = "  " }
 name = "haskell"
 source = { git = "https://github.com/tree-sitter/tree-sitter-haskell", rev = "b6ec26f181dd059eedd506fa5fbeae1b8e5556c8" }
 
+[[language]]
+name = "purescript"
+scope = "source.purescript"
+injection-regex = "purescript"
+file-types = ["purs"]
+roots = ["spago.dhall", "bower.json"]
+comment-token = "--"
+language-server = { command = "purescript-language-server", args = ["--stdio"] }
+indent = { tab-width = 2, unit = "  " }
+auto-format = true
+formatter = { command = "purs-tidy", args = ["format"] }
+grammar = "haskell"
+
 [[language]]
 name = "zig"
 scope = "source.zig"

runtime/queries/purescript/highlights.scm

@@ -0,0 +1 @@
+; inherits: haskell

runtime/queries/purescript/injections.scm

@@ -0,0 +1 @@
+; inherits: haskell

runtime/queries/purescript/locals.scm

@@ -0,0 +1 @@
+; inherits: haskell