editorconfig support (#11)

* Ignore buffers that have editorconfig values set

* Update stylua github workflow

* Add configuration option to control editorconfig overriding

* Allow manual guess indentation to override editorconfig settings

.github/workflows/lint.yml

@@ -2,21 +2,21 @@ name: Style checking
 
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
-    branches: [ main ]
+    branches: [main]
 
   workflow_dispatch:
 
-
 jobs:
   stylua:
     name: StyLua
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Lint with stylua
-        uses: JohnnyMorganz/stylua-action@1.0.0
+        uses: JohnnyMorganz/stylua-action@v2
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          version: latest
           args: --color always --check lua/

README.md

@@ -51,6 +51,7 @@ The plugin provides the following configuration options:
 -- This is the default configuration
 require('guess-indent').setup {
   auto_cmd = true,  -- Set to false to disable automatic execution
+  override_editorconfig = false, -- Set to true to override settings set by .editorconfig
   filetype_exclude = {  -- A list of filetypes for which the auto command gets disabled
     "netrw",
     "tutor",

doc/guess_indent.txt

@@ -51,6 +51,12 @@ instead.
 			created that guesses the indentation style for each
 			buffer that gets opened.
 
+`override_editorconfig`	If this option is set to true, guessed indentation
+			will take precedence over settings set by
+			.editorconfig. Note this only changes the behavior if
+			`auto_cmd` is set to true or if `:GuessIndent` is run
+			with argument `autocmd`.
+
 `filetype_exclude`	A list of file types. If you open a buffer and its
 			'filetype' is contained in this list, then 
 			guess-indent won't run automatically. Note this only

lua/guess-indent/config.lua

@@ -2,6 +2,7 @@ local M = {}
 
 local default_config = {
   auto_cmd = true,
+  override_editorconfig = false,
   filetype_exclude = {
     "netrw",
     "tutor",

lua/guess-indent/init.lua

@@ -267,6 +267,15 @@ end
 -- called by an auto command.
 function M.set_from_buffer(context)
   if context == "auto_cmd" then
+    -- editorconfig interoperability
+    if not config.override_editorconfig then
+      local editorconfig = vim.b.editorconfig
+      if editorconfig and (editorconfig.indent_style or editorconfig.indent_size or editorconfig.tab_width) then
+        utils.v_print(1, "Excluded because of editorconfig settings.")
+        return
+      end
+    end
+
     -- Filter
     local filetype = vim.bo.filetype
     local buftype = vim.bo.buftype