feat(ts): add mustache parser with cloudinit filetype alias

lua/ts.lua

@@ -2,12 +2,17 @@ local log = require("log")
 
 local M = {}
 
+---@class ow.TS.Alias
+---@field lang string
+---@field filetypes? string[]
+
 ---@class ow.TS.Parser
 ---@field lang string
 ---@field location? string
 ---@field generate? boolean
 ---@field from_json? boolean
 ---@field filetypes? string[]
+---@field aliases? ow.TS.Alias[]
 
 ---@class ow.TS.RepoBase
 ---@field src string
@@ -24,6 +29,7 @@ local M = {}
 ---@field generate? boolean
 ---@field from_json? boolean
 ---@field filetypes? string[]
+---@field aliases? ow.TS.Alias[]
 
 ---@class ow.TS.MultiSpec : ow.TS.RepoBase
 ---@field parsers ow.TS.Parser[]
@@ -52,28 +58,62 @@ local function start_treesitter(buf)
     end
 end
 
----@param parser ow.TS.Parser
+---@param lang string
 ---@param so string
-local function register(parser, so)
-    vim.treesitter.language.add(parser.lang, { path = so })
-    local filetypes = { parser.lang }
-    if parser.filetypes then
-        vim.treesitter.language.register(parser.lang, parser.filetypes)
-        vim.list_extend(filetypes, parser.filetypes)
+---@param filetypes? string[]
+---@param symbol_name? string
+local function register_lang(lang, so, filetypes, symbol_name)
+    vim.treesitter.language.add(
+        lang,
+        { path = so, symbol_name = symbol_name }
+    )
+    local fts = { lang }
+    if filetypes then
+        vim.treesitter.language.register(lang, filetypes)
+        vim.list_extend(fts, filetypes)
     end
 
     vim.api.nvim_create_autocmd("FileType", {
         group = vim.api.nvim_create_augroup(
-            "ow.ts.parser." .. parser.lang,
+            "ow.ts.parser." .. lang,
             { clear = true }
         ),
-        pattern = filetypes,
+        pattern = fts,
         callback = function(ev)
             start_treesitter(ev.buf)
         end,
     })
 end
 
+---@class ow.TS.LangEntry
+---@field lang string
+---@field filetypes? string[]
+---@field symbol_name? string
+
+---@param parser ow.TS.Parser
+---@return ow.TS.LangEntry[]
+local function parser_langs(parser)
+    local entries = {
+        { lang = parser.lang, filetypes = parser.filetypes },
+    }
+    for _, alias in ipairs(parser.aliases or {}) do
+        table.insert(entries, {
+            lang = alias.lang,
+            filetypes = alias.filetypes,
+            symbol_name = parser.lang,
+        })
+    end
+    return entries
+end
+
+---@param parser ow.TS.Parser
+---@param so string
+local function register(parser, so)
+    for _, e in ipairs(parser_langs(parser)) do
+        register_lang(e.lang, so, e.filetypes, e.symbol_name)
+    end
+end
+
 ---@param lang string
 local function activate_open_buffers(lang)
     local fts = vim.treesitter.language.get_filetypes(lang)
@@ -110,7 +150,9 @@ local function build(repo, parser)
             return
         end
         register(parser, out)
-        activate_open_buffers(parser.lang)
+        for _, e in ipairs(parser_langs(parser)) do
+            activate_open_buffers(e.lang)
+        end
     end
 
     local function do_build()
@@ -206,6 +248,7 @@ local function spec_to_repo(spec)
                 generate = pick(s.generate, spec.generate),
                 from_json = pick(s.from_json, spec.from_json),
                 filetypes = s.filetypes,
+                aliases = s.aliases,
             })
         end
     else
@@ -225,6 +268,7 @@ local function spec_to_repo(spec)
             generate = spec.generate,
             from_json = spec.from_json,
             filetypes = spec.filetypes,
+            aliases = spec.aliases,
         })
     end