refactor: parser list and lang->ft/ft->lang

- move parser list in `parsers.lua`
- most `ft` variable where changed to `lang`, `ft` is only used on
  autocmd binding, and lang is used for everything else. Functions have
  been defined to make the switch between `ft` and `lang`

lua/nvim-treesitter/parsers.lua

@@ -1,17 +1,255 @@
 local api = vim.api
 local ts = vim.treesitter
 
-local M = {}
+local list = {}
+
+list.javascript = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-javascript",
+    files = { "src/parser.c", "src/scanner.c" },
+  }
+}
+
+list.c = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-c",
+    files = { "src/parser.c" }
+  }
+}
+
+list.cpp = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-cpp",
+    files = { "src/parser.c", "src/scanner.cc" }
+  }
+}
+
+list.rust = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-rust",
+    files = { "src/parser.c", "src/scanner.c" },
+  }
+}
+
+list.lua = {
+  install_info = {
+    url = "https://github.com/nvim-treesitter/tree-sitter-lua",
+    files = { "src/parser.c", "src/scanner.cc" }
+  }
+}
+
+list.python = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-python",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.go = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-go",
+    files = { "src/parser.c" },
+  }
+}
+
+list.ruby = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-ruby",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.bash = {
+  install_info = {
+    url = "https://github.com/nvim-treesitter/tree-sitter-bash",
+    files = { "src/parser.c", "src/scanner.cc" },
+  },
+  filetype = 'sh'
+}
+
+list.php = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-php",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.java = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-java",
+    files = { "src/parser.c" },
+  }
+}
+
+list.html = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-html",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.julia = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-julia",
+    files = { "src/parser.c", "src/scanner.c" },
+  }
+}
+
+list.json = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-json",
+    files = { "src/parser.c" },
+  }
+}
+
+list.css = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-css",
+    files = { "src/parser.c", "src/scanner.c" },
+  }
+}
+
+list.ocaml = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-ocaml",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.swift = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-swift",
+    files = { "src/parser.c" },
+  }
+}
+
+list.c_sharp = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-c-sharp",
+    files = { "src/parser.c", "src/scanner.c" },
+  },
+  filetype = 'cs'
+}
+
+list.typescript = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-typescript",
+    files = { "src/parser.c", "src/scanner.c" },
+    location = "tree-sitter-typescript/typescript"
+  }
+}
+
+list.tsx = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-typescript",
+    files = { "src/parser.c", "src/scanner.c" },
+    location = "tree-sitter-tsx/tsx"
+  },
+  filetype = 'typescriptreact'
+}
+
+list.scala = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-scala",
+    files = { "src/parser.c", "src/scanner.c" },
+  }
+}
+
+list.haskell = {
+  install_info = {
+    url = "https://github.com/tree-sitter/tree-sitter-haskell",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.markdown = {
+  install_info = {
+    url = "https://github.com/ikatyang/tree-sitter-markdown",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.toml = {
+  install_info = {
+    url = "https://github.com/ikatyang/tree-sitter-toml",
+    files = { "src/parser.c", "src/scanner.c" },
+  }
+}
+
+list.vue = {
+  install_info = {
+    url = "https://github.com/ikatyang/tree-sitter-vue",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.elm = {
+  install_info = {
+    url = "https://github.com//razzeee/tree-sitter-elm",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.yaml = {
+  install_info = {
+    url = "https://github.com/ikatyang/tree-sitter-yaml",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.nix = {
+  install_info = {
+    url = "https://github.com/cstrahan/tree-sitter-nix",
+    files = { "src/parser.c", "src/scanner.cc" },
+  }
+}
+
+list.regex = {
+    install_info = {
+        url = "https://github.com/tree-sitter/tree-sitter-regex",
+        files = { "src/parser.c" }
+    }
+}
+
+local M = {
+  list = list
+}
+
+local ft_to_parsername = {}
+for name, obj in pairs(M.list) do
+  if obj.filetype then
+    ft_to_parsername[obj.filetype] = name
+  else
+    ft_to_parsername[name] = name
+  end
+end
+
+function M.ft_to_lang(ft)
+  return ft_to_parsername[ft]
+end
+
+function M.lang_to_ft(lang)
+  return M.list[lang].filetype or lang
+end
+
+function M.available_parsers()
+  return vim.tbl_keys(M.list)
+end
+
+function M.get_parser_configs()
+  return M.list
+end
 
 function M.has_parser(lang)
-  local lang = lang or api.nvim_buf_get_option(0, 'filetype')
+  local buf = api.nvim_get_current_buf()
+  local lang = lang or M.ft_to_lang(api.nvim_buf_get_option(buf, 'ft'))
   if not lang or #lang == 0 then return false end
   return #api.nvim_get_runtime_file('parser/' .. lang .. '.*', false) > 0
 end
 
 function M.get_parser(bufnr, lang)
   local buf = bufnr or api.nvim_get_current_buf()
-  local lang = lang or api.nvim_buf_get_option(buf, 'ft')
+  local lang = lang or M.ft_to_lang(api.nvim_buf_get_option(buf, 'ft'))
 
   if M.has_parser(lang) then
     if not M[buf] then