code_languages.lua

-- MCP Tool: code_languages
-- List supported languages for Tree-sitter code analysis tools
-- Entry kind: function.lua

local treesitter = require("treesitter")
local parser = require("parser")
local queries = require("queries")

local function call(arguments)
    local supported = parser.supported_languages()
    local with_queries = queries.available()

    -- Build query lookup
    local has_queries = {}
    for _, lang in ipairs(with_queries) do
        has_queries[lang] = true
    end

    -- Extension map (reverse)
    local lang_exts = {}
    for ext, lang in pairs(parser.ext_to_lang) do
        if not lang_exts[lang] then
            lang_exts[lang] = {}
        end
        table.insert(lang_exts[lang], "." .. ext)
    end

    -- Sort and format
    local names = {}
    for name, _ in pairs(supported) do
        table.insert(names, name)
    end
    table.sort(names)

    local lines = {}
    table.insert(lines, "# Supported Languages")
    table.insert(lines, "")
    table.insert(lines, string.format("%-14s %-20s %s", "Language", "Extensions", "Query Patterns"))
    table.insert(lines, string.rep("-", 55))

    for _, name in ipairs(names) do
        local exts = lang_exts[name]
        local ext_str = exts and table.concat(exts, ", ") or ""
        local query_str = has_queries[name] and "✓ symbols" or "parse only"
        table.insert(lines, string.format("%-14s %-20s %s", name, ext_str, query_str))
    end

    table.insert(lines, "")
    table.insert(lines, "Languages with '✓ symbols' support code_outline, code_symbols, and code_query.")
    table.insert(lines, "All languages support code_parse and code_diagnostics.")

    return table.concat(lines, "\n")
end

return { call = call }