From f384a3826bae1eb9f500ad6b9dbaa5f904dfbf42 Mon Sep 17 00:00:00 2001
From: Albert Cervin <albert@acervin.com>
Date: Thu, 25 Jan 2024 10:45:45 +0100
Subject: Restore lazy row addition

---
 src/dged/buffer.c | 21 +++++++++++++--------
 src/dged/buffer.h |  3 +++
 src/main/main.c   |  1 +
 3 files changed, 17 insertions(+), 8 deletions(-)

(limited to 'src')

diff --git a/src/dged/buffer.c b/src/dged/buffer.c
index 78b89c8..7eb4b00 100644
--- a/src/dged/buffer.c
+++ b/src/dged/buffer.c
@@ -133,6 +133,7 @@ static struct buffer create_internal(const char *name, char *filename) {
       .text = text_create(10),
       .modified = false,
       .readonly = false,
+      .lazy_row_add = true,
       .lang =
           filename != NULL ? lang_from_filename(filename) : lang_from_id("fnd"),
       .last_write = {0},
@@ -570,14 +571,18 @@ struct location buffer_clamp(struct buffer *buffer, int64_t line, int64_t col) {
     return location;
   }
 
-  movev(buffer, line, &location);
-  moveh(buffer, col, &location);
-
-  // when clamping we want to stay inside
-  // the actual bounds
-  if (location.line >= buffer_num_lines(buffer)) {
-    location.line = buffer_num_lines(buffer) - 1;
-    location.col = buffer_num_chars(buffer, location.line);
+  if (line > buffer_num_lines(buffer)) {
+    if (buffer->lazy_row_add) {
+      location.line = buffer_num_lines(buffer);
+      location.col = 0;
+    } else {
+      location.line = buffer_num_lines(buffer) - 1;
+      location.col = buffer_num_chars(buffer, location.line);
+    }
+  } else {
+    location.line = line;
+    uint32_t nchars = buffer_num_chars(buffer, location.col);
+    location.col = col > nchars ? nchars : col;
   }
 
   return location;
diff --git a/src/dged/buffer.h b/src/dged/buffer.h
index 7e4ef78..1e00b9d 100644
--- a/src/dged/buffer.h
+++ b/src/dged/buffer.h
@@ -50,6 +50,9 @@ struct buffer {
 
   /** Can this buffer be changed */
   bool readonly;
+
+  /** Can rows be added lazily to this buffer */
+  bool lazy_row_add;
 };
 
 void buffer_static_init();
diff --git a/src/main/main.c b/src/main/main.c
index 1bb3003..02afd2b 100644
--- a/src/main/main.c
+++ b/src/main/main.c
@@ -226,6 +226,7 @@ int main(int argc, char *argv[]) {
 
   struct buffer *ib = buffers_add(&buflist, initial_buffer);
   struct buffer minibuffer = buffer_create("minibuffer");
+  minibuffer.lazy_row_add = false;
   minibuffer_init(&minibuffer);
 
   windows_init(display_height(display), display_width(display), ib,
-- 
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