From 9ddfed92ff1b64d7921be21a7d61bb1fed0d661b Mon Sep 17 00:00:00 2001
From: Krzosa Karol <krzosa@proton.me>
Date: Mon, 5 May 2025 21:21:31 +0200
Subject: [PATCH] title bar renaming

---
 src/basic/string16.cpp        | 26 +++++++++++++++
 src/text_editor/title_bar.cpp | 59 ++++++++++++++++++++++++++++++-----
 2 files changed, 78 insertions(+), 7 deletions(-)

diff --git a/src/basic/string16.cpp b/src/basic/string16.cpp
index 29aeeb3..a43fdb0 100644
--- a/src/basic/string16.cpp
+++ b/src/basic/string16.cpp
@@ -313,3 +313,29 @@ String16 SkipWhitespace(String16 *string) {
     return begin;
 }
 
+// chop this - :324
+String16 ChopNumberEx(String16 *string) {
+    String16 col = {};
+    for (int64_t i = string->len - 1; i >= 0; i -= 1) {
+        if (IsDigit(string->data[i])) {
+            col.data = string->data + i;
+            col.len += 1;
+        } else if (string->data[i] == L':') {
+            break;
+        } else {
+            return {};
+        }
+    }
+    *string = Chop(*string, col.len + 1);
+    return col;
+}
+
+Int ChopNumber(String16 *string) {
+    Scratch  scratch;
+    String16 col = ChopNumberEx(string);
+    if (col.len == 0) return -1;
+    String num_string = ToString(scratch, col);
+    Int    result     = strtoll(num_string.data, NULL, 10) - 1;
+
+    return result;
+}
\ No newline at end of file
diff --git a/src/text_editor/title_bar.cpp b/src/text_editor/title_bar.cpp
index 3dd8eef..c0d432c 100644
--- a/src/text_editor/title_bar.cpp
+++ b/src/text_editor/title_bar.cpp
@@ -22,13 +22,58 @@ void UpdateDebugBuffer() {
 }
 
 void ReplaceTitleBarData(Window *window) {
-    BSet title           = GetBSet(window);
+    Scratch scratch;
+    BSet main = GetMainSet(window);
+    BSet title = GetBSet(window);
     title.view->scroll.y = 0;
 
-    if (window->id == ActiveWindow) return;
+    String16 buffer_string = GetString(title.buffer);
+    Range replace_range = {0, title.buffer->len};
+    bool found_separator = Seek(buffer_string, u" |", &replace_range.max);
+
+    if (window->id == ActiveWindow) {
+        if (title.buffer->change_id == title.window->title_bar_last_buffer_change_id) {
+            return;
+        }
+        String16 buffer_name = GetString(title.buffer, replace_range);
+        buffer_name = Trim(buffer_name);
+
+        Int column = ChopNumber(&buffer_name);
+        if (column == -1) return;
+
+        Int line = ChopNumber(&buffer_name);
+        if (line == -1) {
+            line   = column;
+            column = 0;
+        }
+
+        String name = ToString(scratch, buffer_name);
+        if (name != main.buffer->name) {
+            name = GetAbsolutePath(scratch, name);
+            if (GetBufferStrict(name)) {
+                title.window->title_bar_last_buffer_change_id = title.buffer->change_id;
+                ReportConsolef("there is already buffer with name: %.*s", FmtString(name));
+                return;
+            }
+
+            main.buffer->name = Intern(&GlobalInternTable, name);
+        }
+
+        Int buffer_pos = XYToPos(main.buffer, {column, line});
+
+        Caret &caret = main.view->carets[0];
+        if (GetFront(caret) != buffer_pos) {
+            caret = MakeCaret(buffer_pos);
+        }
+
+        title.window->title_bar_last_buffer_change_id = title.buffer->change_id;
+        main.buffer->file_mod_time = 0;
+        main.buffer->changed_on_disk = false;
+        main.buffer->dirty = true;
+
+        return;
+    }
 
-    BSet    main = GetMainSet(window);
-    Scratch scratch;
     Caret   caret = main.view->carets[0];
     XY      xy    = PosToXY(main.buffer, GetFront(caret));
 
@@ -38,14 +83,14 @@ void ReplaceTitleBarData(Window *window) {
         title.view->carets = caret_copy;
     };
 
-    String16 buffer_string = GetString(title.buffer);
-    Range    replace_range = {0, title.buffer->len};
-    if (!Seek(buffer_string, u" |", &replace_range.max)) {
+    // add separator at the end of buffer
+    if (!found_separator) {
         Command_SelectRangeOneCursor(title.view, GetEndAsRange(title.buffer));
         Array<Edit> edits = Command_ReplaceEx(scratch, title.view, u" |");
         AdjustCarets(edits, &caret_copy);
     }
 
+    // replace data up to separator with filename and stuff
     char    *reopen            = main.buffer->changed_on_disk ? " Reopen()" : "";
     String   s                 = Format(scratch, "%.*s:%lld:%lld%s", FmtString(main.buffer->name), (long long)xy.line + 1ll, (long long)xy.col + 1ll, reopen);
     String16 string            = ToString16(scratch, s);