From 76cd1aa9c674db76e2a95db5a95aa79c5a2ce4ae Mon Sep 17 00:00:00 2001
From: pommicket <pommicket@gmail.com>
Date: Sun, 15 Oct 2023 14:36:12 -0400
Subject: remove-trailing-whitespace option

---
 buffer.c       | 20 +++++++++++++++++++-
 config.c       |  1 +
 ted-internal.h |  1 +
 ted.cfg        |  6 ++++--
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/buffer.c b/buffer.c
index c006096..35330ec 100644
--- a/buffer.c
+++ b/buffer.c
@@ -3139,6 +3139,7 @@ static bool buffer_write_to_file(TextBuffer *buffer, const char *path) {
 		buffer_error(buffer, "Couldn't open file %s for writing: %s.", path, strerror(errno));
 		return false;
 	}
+	buffer_start_edit_chain(buffer);
 	if (settings->auto_add_newline) {
 		Line *last_line = &buffer->lines[buffer->nlines - 1];
 		if (last_line->len) {
@@ -3148,7 +3149,24 @@ static bool buffer_write_to_file(TextBuffer *buffer, const char *path) {
 			buffer_insert_text_at_pos(buffer, buffer_pos_end_of_file(buffer), s);
 		}
 	}
-	
+	if (settings->remove_trailing_whitespace) {
+		// remove trailing whitespace
+		for (u32 l = 0; l < buffer->nlines; l++) {
+			Line *line = &buffer->lines[l];
+			u32 i = line->len;
+			while (i > 0 && is32_space(line->str[i - 1])) {
+				i -= 1;
+			}
+			if (i < line->len) {
+				BufferPos pos = {
+					.line = l,
+					.index = i,
+				};
+				buffer_delete_chars_at_pos(buffer, pos, line->len - i);
+			}
+		}
+	}
+	buffer_end_edit_chain(buffer);
 	bool success = true;
 	
 	for (u32 i = 0; i < buffer->nlines; ++i) {
diff --git a/config.c b/config.c
index 0098095..3e9aa2a 100644
--- a/config.c
+++ b/config.c
@@ -100,6 +100,7 @@ static const Settings settings_zero = {0};
 static const SettingBool settings_bool[] = {
 	{"auto-indent", &settings_zero.auto_indent, true},
 	{"auto-add-newline", &settings_zero.auto_add_newline, true},
+	{"remove-trailing-whitespace", &settings_zero.remove_trailing_whitespace, true},
 	{"auto-reload", &settings_zero.auto_reload, true},
 	{"auto-reload-config", &settings_zero.auto_reload_config, false},
 	{"syntax-highlighting", &settings_zero.syntax_highlighting, true},
diff --git a/ted-internal.h b/ted-internal.h
index 2a6eb27..5594adc 100644
--- a/ted-internal.h
+++ b/ted-internal.h
@@ -115,6 +115,7 @@ struct Settings {
 	u16 lsp_port;
 	bool auto_indent;
 	bool auto_add_newline;
+	bool remove_trailing_whitespace;
 	bool syntax_highlighting;
 	bool line_numbers;
 	bool auto_reload;
diff --git a/ted.cfg b/ted.cfg
index 8fd7be3..8ad5362 100644
--- a/ted.cfg
+++ b/ted.cfg
@@ -31,10 +31,12 @@ max-menu-width = 600
 padding = 6
 error-display-time = 10
 auto-indent = on
+line-numbers = on
+syntax-highlighting = on
 # automatically add a newline at the end of the file on save
 auto-add-newline = on
-syntax-highlighting = on
-line-numbers = on
+# automatically remove trailing whitespace at end of line on save
+remove-trailing-whitespace = off
 # if set to "on", when a file is changed by another program, it will be reloaded by ted without asking you.
 auto-reload = on
 # automatically reload config when saved
-- 
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