Optionally use lsp as default formatter

Author: erikzaadi

README.md

@@ -39,8 +39,10 @@ ft('go'):fmt('lsp')
 
 -- call setup LAST
 require('guard').setup({
-    -- the only option for the setup function
+    -- the only options for the setup function
     fmt_on_save = true,
+    -- Use lsp if no formatter was defined for this filetype
+    lsp_as_default_formatter = false,
 })
 ```
 
@@ -85,7 +87,7 @@ Table format for custom tool:
 - `clang-tidy`
 - `Pylint`
 
-## Trobuleshooting
+## Troubleshooting
 
 if guard does not auto format on save, run `checkhealth` first.
 

doc/guard.nvim.txt

@@ -40,23 +40,25 @@ examples, more info below.
 
 >lua
     local ft = require('guard.filetype')
-    
+
     -- use clang-format and clang-tidy for c files
     ft('c'):fmt('clang-format')
            :lint('clang-tidy')
-    
+
     -- use stylua to format lua files and no linter
     ft('lua'):fmt('stylua')
-    
+
     -- use lsp to format first then use golines to format
     ft('go'):fmt('lsp')
             :append('golines')
             :lint('golangci')
-    
+
     -- call setup LAST
     require('guard').setup({
-        -- the only option for the setup function
-        fmt_on_save = true,
+        -- the only options for the setup function
+	fmt_on_save = true,
+	-- Use lsp if no formatter was defined for this filetype
+	lsp_as_default_formatter = false,
     })
 <
 
@@ -92,7 +94,7 @@ Table format for custom tool:
         timeout          --integer
         ignore_pattern   --table ignore run format when pattern match
         ignore_error     --when has lsp error ignore format
-    
+
         --special
         fn       --function if fn is set other field will not take effect
     }

lua/guard/config.lua

@@ -0,0 +1,5 @@
+local M = {
+    lsp_as_default_formatter = false
+}
+
+return M

lua/guard/format.lua

@@ -4,6 +4,7 @@ local uv = vim.version().minor >= 10 and vim.uv or vim.loop
 local spawn = require('guard.spawn').try_spawn
 local get_prev_lines = require('guard.util').get_prev_lines
 local filetype = require('guard.filetype')
+local config = require('guard.config')
 local util = require('guard.util')
 
 local function ignored(buf, patterns)
@@ -62,7 +63,7 @@ end
 
 local function do_fmt(buf)
   buf = buf or api.nvim_get_current_buf()
-  if not filetype[vim.bo[buf].filetype] then
+  if not filetype[vim.bo[buf].filetype] and not config.lsp_as_default_formatter then
     vim.notify('[Guard] missing config for filetype ' .. vim.bo[buf].filetype, vim.log.levels.ERROR)
     return
   end
@@ -75,7 +76,7 @@ local function do_fmt(buf)
   end
   local prev_lines = util.get_prev_lines(buf, srow, erow)
 
-  local fmt_configs = filetype[vim.bo[buf].filetype].format
+  local fmt_configs = filetype[vim.bo[buf].filetype] and filetype[vim.bo[buf].filetype].format or { 'lsp' }
   local formatter = require('guard.tools.formatter')
   local fname = vim.fn.fnameescape(api.nvim_buf_get_name(buf))
 

lua/guard/init.lua

@@ -1,5 +1,6 @@
 local api = vim.api
 local group = api.nvim_create_augroup('Guard', { clear = true })
+local config = require('guard.config')
 
 local function register_event(fts)
   api.nvim_create_autocmd('FileType', {
@@ -25,12 +26,17 @@ end
 local function setup(opt)
   opt = opt or {
     fmt_on_save = true,
+    lsp_as_default_formatter = false,
   }
   local fts_config = require('guard.filetype')
   if opt.fmt_on_save then
     register_event(vim.tbl_keys(fts_config))
   end
 
+  if opt.lsp_as_default_formatter then
+    config.lsp_as_default_formatter = true
+  end
+
   local lint = require('guard.lint')
   for ft, conf in pairs(fts_config) do
     if conf.linter then