1 files changed, 74 insertions, 0 deletions
diff --git a/lua/lsp/null-ls/formatters.lua b/lua/lsp/null-ls/formatters.lua
new file mode 100644
index 00000000..26be00da
--- /dev/null
+++ b/lua/lsp/null-ls/formatters.lua
@@ -0,0 +1,74 @@
+local M = {}
+local formatters_by_ft = {}
+
+local null_ls = require "null-ls"
+local services = require "lsp.null-ls.services"
+local Log = require "core.log"
+
+local function list_names(formatters, options)
+  options = options or {}
+  local filter = options.filter or "supported"
+
+  return vim.tbl_keys(formatters[filter])
+end
+
+function M.list_supported_names(filetype)
+  if not formatters_by_ft[filetype] then
+    return {}
+  end
+  return list_names(formatters_by_ft[filetype], { filter = "supported" })
+end
+
+function M.list_unsupported_names(filetype)
+  if not formatters_by_ft[filetype] then
+    return {}
+  end
+  return list_names(formatters_by_ft[filetype], { filter = "unsupported" })
+end
+
+function M.list_available(filetype)
+  local formatters = {}
+  for _, provider in pairs(null_ls.builtins.formatting) do
+    -- TODO: Add support for wildcard filetypes
+    if vim.tbl_contains(provider.filetypes or {}, filetype) then
+      table.insert(formatters, provider.name)
+    end
+  end
+
+  return formatters
+end
+
+function M.list_configured(formatter_configs)
+  local formatters, errors = {}, {}
+
+  for _, fmt_config in ipairs(formatter_configs) do
+    local formatter = null_ls.builtins.formatting[fmt_config.exe]
+
+    if not formatter then
+      Log:error("Not a valid formatter:", fmt_config.exe)
+      errors[fmt_config.exe] = {} -- Add data here when necessary
+    else
+      local formatter_cmd = services.find_command(formatter._opts.command)
+      if not formatter_cmd then
+        Log:warn("Not found:", formatter._opts.command)
+        errors[fmt_config.exe] = {} -- Add data here when necessary
+      else
+        Log:debug("Using formatter:", formatter_cmd)
+        formatters[fmt_config.exe] = formatter.with { command = formatter_cmd, extra_args = fmt_config.args }
+      end
+    end
+  end
+
+  return { supported = formatters, unsupported = errors }
+end
+
+function M.setup(filetype, options)
+  if not lvim.lang[filetype] or (formatters_by_ft[filetype] and not options.force_reload) then
+    return
+  end
+
+  formatters_by_ft[filetype] = M.list_configured(lvim.lang[filetype].formatters)
+  null_ls.register { sources = formatters_by_ft[filetype].supported }
+end
+
+return M