Format on save should ignore selected text.

Author: orbitalquark

README.md

@@ -22,7 +22,7 @@ Ctrl+Shift+J | ⌘⇧J | M-S-J | Reformat paragraph
 ## `format.code`()
 
 Reformats using a code formatter for the current buffer's lexer language either the selected
-text or the current paragraph, according to the rules of `textadept.editing.filter_through()`.
+text or the current buffer, according to the rules of `textadept.editing.filter_through()`.
 
 See also: [`format.commands`](#format.commands)
 
@@ -33,7 +33,6 @@ Map of lexer languages to string code formatter commands or functions that retur
 commands.
 
 Fields:
-
 - `lua`: 
 - `cpp`: 
 - `go`: 
@@ -60,7 +59,6 @@ List of footer lines to ignore when reformatting paragraphs.
 These can be Doxygen footers for example.
 
 Fields:
-
 - `*/`: 
 
 Usage:
@@ -77,7 +75,6 @@ List of header lines to ignore when reformatting paragraphs.
 These can be LuaDoc/LDoc or Doxygen headers for example.
 
 Fields:
-
 - `---`: 
 - `/**`: 
 
@@ -125,7 +122,6 @@ line prefixes. For example, LuaDoc/LDoc comments start with '---' but continue w
 and Doxygen comments start with '/**' but continue with ' *'.
 
 Fields:
-
 - `[/**]`: 
 - `[---]`: 
 

init.lua

@@ -81,7 +81,7 @@ M.on_save = true
 M.line_length = 100
 
 --- Reformats using a code formatter for the current buffer's lexer language either the selected
--- text or the current paragraph, according to the rules of `textadept.editing.filter_through()`.
+-- text or the current buffer, according to the rules of `textadept.editing.filter_through()`.
 -- @see commands
 function M.code()
 	local command = M.commands[buffer.lexer_language]
@@ -98,7 +98,10 @@ events.connect(events.FILE_BEFORE_SAVE, function(filename)
 	if filename then
 		for _, patt in ipairs(M.ignore_file_patterns) do if filename:find(patt) then return end end
 	end
+	local selection = buffer.selection_serialized
+	buffer:set_empty_selection(buffer.current_pos)
 	M.code()
+	buffer.selection_serialized = selection
 end)
 
 --- Reformats using the Unix `fmt` tool either the selected text or the current paragraph,

init_test.lua

@@ -33,6 +33,20 @@ test('format.code should not format on save if format.on_save is disabled', func
 end)
 if not have_clang_format then skip('clang-format is not available') end
 
+test('format.on_save should ignore selected text', function()
+	local _<close> = test.mock(io, 'ensure_final_newline', false)
+	local file = 'file.c'
+	local dir<close> = test.tmpdir{['.clang-format'] = 'BasedOnStyle: LLVM', file}
+	io.open_file(dir / file)
+	buffer:append_text('int main(){return 0;}')
+	buffer:word_right_end_extend()
+
+	buffer:save()
+
+	test.assert_equal(buffer:get_text(), 'int main() { return 0; }')
+	test.assert_equal(buffer:get_sel_text(), 'int')
+end)
+
 test('format.code should ignore saving files matching format.ignore_file_patterns', function()
 	local subdir = 'subdir'
 	local subfile = 'subfile.c'