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authorLeo Tenenbaum <pommicket@gmail.com>2020-12-29 20:36:16 -0500
committerLeo Tenenbaum <pommicket@gmail.com>2020-12-29 20:36:16 -0500
commit51837743b0f90973bf63582a8f34662e9677629e (patch)
treefee7d2dd0b3be97c2ff678b56e5564549b6ca7fd /buffer.c
parentad9dfcbc8542fa478d9afbfb13a953b6da8186c7 (diff)
Home and end
Diffstat (limited to 'buffer.c')
-rw-r--r--buffer.c112
1 files changed, 83 insertions, 29 deletions
diff --git a/buffer.c b/buffer.c
index e524e67..ee45d2c 100644
--- a/buffer.c
+++ b/buffer.c
@@ -40,7 +40,6 @@ typedef struct {
} TextBuffer;
-
void buffer_create(TextBuffer *buffer, Font *font) {
util_zero_memory(buffer, sizeof *buffer);
buffer->font = font;
@@ -136,12 +135,12 @@ char32_t buffer_char_at_pos(TextBuffer *buffer, BufferPos p) {
}
}
-BufferPos buffer_start_pos(TextBuffer *buffer) {
+BufferPos buffer_pos_start_of_file(TextBuffer *buffer) {
(void)buffer;
return (BufferPos){.line = 0, .index = 0};
}
-BufferPos buffer_end_pos(TextBuffer *buffer) {
+BufferPos buffer_pos_end_of_file(TextBuffer *buffer) {
return (BufferPos){.line = buffer->nlines - 1, .index = buffer->lines[buffer->nlines-1].len};
}
@@ -212,7 +211,7 @@ static BufferPos buffer_pos_advance(TextBuffer *buffer, BufferPos pos, size_t nc
index = 0;
++line;
}
- return buffer_end_pos(buffer);
+ return buffer_pos_end_of_file(buffer);
}
@@ -815,7 +814,7 @@ i64 buffer_pos_move_horizontally(TextBuffer *buffer, BufferPos *p, i64 by) {
} else if (by > 0) {
i64 by_start = by;
if (p->line >= buffer->nlines)
- *p = buffer_end_pos(buffer); // invalid position; move to end of buffer
+ *p = buffer_pos_end_of_file(buffer); // invalid position; move to end of buffer
Line *line = &buffer->lines[p->line];
while (by > 0) {
if (by <= line->len - p->index) {
@@ -1037,6 +1036,39 @@ i64 buffer_cursor_move_right_words(TextBuffer *buffer, i64 nwords) {
return ret;
}
+// Returns the position corresponding to the start of the given line.
+BufferPos buffer_pos_start_of_line(TextBuffer *buffer, u32 line) {
+ (void)buffer;
+ return (BufferPos){
+ .line = line,
+ .index = 0
+ };
+}
+
+BufferPos buffer_pos_end_of_line(TextBuffer *buffer, u32 line) {
+ return (BufferPos){
+ .line = line,
+ .index = buffer->lines[line].len
+ };
+}
+
+void buffer_cursor_move_to_start_of_line(TextBuffer *buffer) {
+ buffer_cursor_move_to_pos(buffer, buffer_pos_start_of_line(buffer, buffer->cursor_pos.line));
+}
+
+void buffer_cursor_move_to_end_of_line(TextBuffer *buffer) {
+ buffer_cursor_move_to_pos(buffer, buffer_pos_end_of_line(buffer, buffer->cursor_pos.line));
+}
+
+void buffer_cursor_move_to_start_of_file(TextBuffer *buffer) {
+ buffer_cursor_move_to_pos(buffer, buffer_pos_start_of_file(buffer));
+}
+
+void buffer_cursor_move_to_end_of_file(TextBuffer *buffer) {
+ buffer_cursor_move_to_pos(buffer, buffer_pos_end_of_file(buffer));
+}
+
+
// insert `number` empty lines starting at index `where`.
static void buffer_insert_lines(TextBuffer *buffer, u32 where, u32 number) {
u32 old_nlines = buffer->nlines;
@@ -1137,50 +1169,69 @@ BufferPos buffer_insert_text_at_pos(TextBuffer *buffer, BufferPos pos, String32
BufferPos b = {.line = line_idx, .index = index};
return b;
}
-
-// like shift+left in most editors, move cursor nchars chars to the left, selecting everything in between
-void buffer_select_left(TextBuffer *buffer, i64 nchars) {
+
+// Select (or add to selection) everything between the cursor and pos, and move the cursor to pos
+void buffer_select_to_pos(TextBuffer *buffer, BufferPos pos) {
if (!buffer->selection)
buffer->selection_pos = buffer->cursor_pos;
- buffer_cursor_move_left(buffer, nchars);
+ buffer_cursor_move_to_pos(buffer, pos);
buffer->selection = !buffer_pos_eq(buffer->cursor_pos, buffer->selection_pos); // disable selection if cursor_pos = selection_pos.
}
+// Like shift+left in most editors, move cursor nchars chars to the left, selecting everything in between
+void buffer_select_left(TextBuffer *buffer, i64 nchars) {
+ BufferPos cpos = buffer->cursor_pos;
+ buffer_pos_move_left(buffer, &cpos, nchars);
+ buffer_select_to_pos(buffer, cpos);
+}
+
void buffer_select_right(TextBuffer *buffer, i64 nchars) {
- if (!buffer->selection)
- buffer->selection_pos = buffer->cursor_pos;
- buffer_cursor_move_right(buffer, nchars);
- buffer->selection = !buffer_pos_eq(buffer->cursor_pos, buffer->selection_pos);
+ BufferPos cpos = buffer->cursor_pos;
+ buffer_pos_move_right(buffer, &cpos, nchars);
+ buffer_select_to_pos(buffer, cpos);
}
void buffer_select_down(TextBuffer *buffer, i64 nchars) {
- if (!buffer->selection)
- buffer->selection_pos = buffer->cursor_pos;
- buffer_cursor_move_down(buffer, nchars);
- buffer->selection = !buffer_pos_eq(buffer->cursor_pos, buffer->selection_pos);
+ BufferPos cpos = buffer->cursor_pos;
+ buffer_pos_move_down(buffer, &cpos, nchars);
+ buffer_select_to_pos(buffer, cpos);
}
void buffer_select_up(TextBuffer *buffer, i64 nchars) {
- if (!buffer->selection)
- buffer->selection_pos = buffer->cursor_pos;
- buffer_cursor_move_up(buffer, nchars);
- buffer->selection = !buffer_pos_eq(buffer->cursor_pos, buffer->selection_pos);
+ BufferPos cpos = buffer->cursor_pos;
+ buffer_pos_move_up(buffer, &cpos, nchars);
+ buffer_select_to_pos(buffer, cpos);
}
void buffer_select_left_words(TextBuffer *buffer, i64 nwords) {
- if (!buffer->selection)
- buffer->selection_pos = buffer->cursor_pos;
- buffer_cursor_move_left_words(buffer, nwords);
- buffer->selection = !buffer_pos_eq(buffer->cursor_pos, buffer->selection_pos);
+ BufferPos cpos = buffer->cursor_pos;
+ buffer_pos_move_left_words(buffer, &cpos, nwords);
+ buffer_select_to_pos(buffer, cpos);
}
void buffer_select_right_words(TextBuffer *buffer, i64 nwords) {
- if (!buffer->selection)
- buffer->selection_pos = buffer->cursor_pos;
- buffer_cursor_move_right_words(buffer, nwords);
- buffer->selection = !buffer_pos_eq(buffer->cursor_pos, buffer->selection_pos);
+ BufferPos cpos = buffer->cursor_pos;
+ buffer_pos_move_right_words(buffer, &cpos, nwords);
+ buffer_select_to_pos(buffer, cpos);
}
+void buffer_select_to_start_of_line(TextBuffer *buffer) {
+ buffer_select_to_pos(buffer, buffer_pos_start_of_line(buffer, buffer->cursor_pos.line));
+}
+
+void buffer_select_to_end_of_line(TextBuffer *buffer) {
+ buffer_select_to_pos(buffer, buffer_pos_end_of_line(buffer, buffer->cursor_pos.line));
+}
+
+void buffer_select_to_start_of_file(TextBuffer *buffer) {
+ buffer_select_to_pos(buffer, buffer_pos_start_of_file(buffer));
+}
+
+void buffer_select_to_end_of_file(TextBuffer *buffer) {
+ buffer_select_to_pos(buffer, buffer_pos_end_of_file(buffer));
+}
+
+
static void buffer_shorten_line(Line *line, u32 new_len) {
assert(line->len >= new_len);
line->len = new_len; // @OPTIMIZE(memory): decrease line capacity
@@ -1609,6 +1660,9 @@ void buffer_render(TextBuffer *buffer, float x1, float y1, float x2, float y2) {
// highlight everything from index1 to index2
u32 n_columns_highlighted = buffer_index_to_column(buffer, line_idx, index2)
- buffer_index_to_column(buffer, line_idx, index1);
+ if (line_idx != sel_end.line) {
+ ++n_columns_highlighted; // highlight the newline (otherwise empty higlighted lines wouldn't be highlighted at all).
+ }
if (n_columns_highlighted) {
BufferPos p1 = {.line = line_idx, .index = index1};