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-rw-r--r--src/buffer.c218
1 files changed, 163 insertions, 55 deletions
diff --git a/src/buffer.c b/src/buffer.c
index 8a86e69..6af7329 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -23,8 +23,14 @@ struct modeline {
#define KILL_RING_SZ 64
static struct kill_ring {
struct text_chunk buffer[KILL_RING_SZ];
+ struct buffer_location last_paste;
+ bool paste_up_to_date;
uint32_t curr_idx;
-} g_kill_ring = {.curr_idx = 0};
+ uint32_t paste_idx;
+} g_kill_ring = {.curr_idx = 0,
+ .last_paste = {0},
+ .paste_idx = 0,
+ .paste_up_to_date = false};
struct update_hook_result buffer_linenum_hook(struct buffer *buffer,
struct command_list *commands,
@@ -48,8 +54,7 @@ struct buffer buffer_create(char *name, bool modeline) {
.mark_set = false,
.keymaps = calloc(10, sizeof(struct keymap)),
.nkeymaps = 1,
- .scroll_col = 0,
- .scroll_line = 0,
+ .scroll = {0},
.update_hooks = {0},
.nkeymaps_max = 10,
};
@@ -72,6 +77,9 @@ struct buffer buffer_create(char *name, bool modeline) {
BINDING(Ctrl, 'A', "beginning-of-line"),
BINDING(Ctrl, 'E', "end-of-line"),
+ BINDING(Meta, '<', "goto-beginning"),
+ BINDING(Meta, '>', "goto-end"),
+
BINDING(ENTER, "newline"),
BINDING(TAB, "indent"),
@@ -84,6 +92,7 @@ struct buffer buffer_create(char *name, bool modeline) {
BINDING(Ctrl, 'W', "cut"),
BINDING(Ctrl, 'Y', "paste"),
+ BINDING(Meta, 'y', "paste-older"),
BINDING(Meta, 'w', "copy"),
};
keymap_bind_keys(&b.keymaps[0], bindings,
@@ -138,14 +147,24 @@ void buffer_add_keymap(struct buffer *buffer, struct keymap *keymap) {
++buffer->nkeymaps;
}
+void buffer_goto_beginning(struct buffer *buffer) {
+ buffer->dot.col = 0;
+ buffer->dot.line = 0;
+}
+
+void buffer_goto_end(struct buffer *buffer) {
+ buffer->dot.line = text_num_lines(buffer->text);
+ buffer->dot.col = 0;
+}
+
bool movev(struct buffer *buffer, int rowdelta) {
int64_t new_line = (int64_t)buffer->dot.line + rowdelta;
if (new_line < 0) {
buffer->dot.line = 0;
return false;
- } else if (new_line > text_num_lines(buffer->text) - 1) {
- buffer->dot.line = text_num_lines(buffer->text) - 1;
+ } else if (new_line > text_num_lines(buffer->text)) {
+ buffer->dot.line = text_num_lines(buffer->text);
return false;
} else {
buffer->dot.line = (uint32_t)new_line;
@@ -191,15 +210,20 @@ struct region to_region(struct buffer_location dot,
return reg;
}
-bool region_has_size(struct buffer *buffer) {
+struct region buffer_get_region(struct buffer *buffer) {
+ return to_region(buffer->dot, buffer->mark);
+}
+
+bool buffer_region_has_size(struct buffer *buffer) {
return buffer->mark_set &&
(labs((int64_t)buffer->mark.line - (int64_t)buffer->dot.line) +
labs((int64_t)buffer->mark.col - (int64_t)buffer->dot.col)) > 0;
}
struct text_chunk *copy_region(struct buffer *buffer, struct region region) {
- g_kill_ring.curr_idx = g_kill_ring.curr_idx + 1 % KILL_RING_SZ;
struct text_chunk *curr = &g_kill_ring.buffer[g_kill_ring.curr_idx];
+ g_kill_ring.curr_idx = g_kill_ring.curr_idx + 1 % KILL_RING_SZ;
+
if (curr != NULL) {
free(curr->text);
}
@@ -212,23 +236,57 @@ struct text_chunk *copy_region(struct buffer *buffer, struct region region) {
}
void buffer_copy(struct buffer *buffer) {
- if (region_has_size(buffer)) {
- struct region reg = to_region(buffer->dot, buffer->mark);
+ if (buffer_region_has_size(buffer)) {
+ struct region reg = buffer_get_region(buffer);
struct text_chunk *curr = copy_region(buffer, reg);
buffer_clear_mark(buffer);
}
}
+void paste(struct buffer *buffer, uint32_t ring_idx) {
+ if (ring_idx > 0) {
+ struct text_chunk *curr = &g_kill_ring.buffer[ring_idx - 1];
+ if (curr != NULL) {
+ g_kill_ring.last_paste = buffer->mark_set ? buffer->mark : buffer->dot;
+ buffer_add_text(buffer, curr->text, curr->nbytes);
+ g_kill_ring.paste_up_to_date = true;
+ }
+ }
+}
+
void buffer_paste(struct buffer *buffer) {
- struct text_chunk *curr = &g_kill_ring.buffer[g_kill_ring.curr_idx];
- if (curr != NULL) {
- buffer_add_text(buffer, curr->text, curr->nbytes);
+ g_kill_ring.paste_idx = g_kill_ring.curr_idx;
+ paste(buffer, g_kill_ring.curr_idx);
+}
+
+void buffer_paste_older(struct buffer *buffer) {
+ if (g_kill_ring.paste_up_to_date) {
+
+ // remove previous paste
+ struct text_chunk *curr = &g_kill_ring.buffer[g_kill_ring.curr_idx];
+ text_delete(buffer->text, g_kill_ring.last_paste.line,
+ g_kill_ring.last_paste.col, buffer->dot.line, buffer->dot.col);
+
+ // place ourselves right
+ buffer->dot = g_kill_ring.last_paste;
+
+ // paste older
+ if (g_kill_ring.paste_idx - 1 > 0) {
+ --g_kill_ring.paste_idx;
+ } else {
+ g_kill_ring.paste_idx = g_kill_ring.curr_idx;
+ }
+
+ paste(buffer, g_kill_ring.paste_idx);
+
+ } else {
+ buffer_paste(buffer);
}
}
void buffer_cut(struct buffer *buffer) {
- if (region_has_size(buffer)) {
- struct region reg = to_region(buffer->dot, buffer->mark);
+ if (buffer_region_has_size(buffer)) {
+ struct region reg = buffer_get_region(buffer);
copy_region(buffer, reg);
text_delete(buffer->text, reg.begin.line, reg.begin.col, reg.end.line,
reg.end.col);
@@ -237,6 +295,20 @@ void buffer_cut(struct buffer *buffer) {
}
}
+bool maybe_delete_region(struct buffer *buffer) {
+ if (buffer_region_has_size(buffer)) {
+ struct region reg = buffer_get_region(buffer);
+ text_delete(buffer->text, reg.begin.line, reg.begin.col, reg.end.line,
+ reg.end.col);
+
+ buffer_clear_mark(buffer);
+ buffer->dot = reg.begin;
+ return true;
+ }
+
+ return false;
+}
+
void buffer_kill_line(struct buffer *buffer) {
uint32_t nchars = text_line_length(buffer->text, buffer->dot.line);
if (nchars == 0) {
@@ -257,11 +329,19 @@ void buffer_kill_line(struct buffer *buffer) {
}
void buffer_forward_delete_char(struct buffer *buffer) {
+ if (maybe_delete_region(buffer)) {
+ return;
+ }
+
text_delete(buffer->text, buffer->dot.line, buffer->dot.col, buffer->dot.line,
buffer->dot.col + 1);
}
void buffer_backward_delete_char(struct buffer *buffer) {
+ if (maybe_delete_region(buffer)) {
+ return;
+ }
+
moveh(buffer, -1);
buffer_forward_delete_char(buffer);
}
@@ -358,9 +438,8 @@ void buffer_to_file(struct buffer *buffer) {
buffer->name);
return;
}
- // TODO: handle errors
- FILE *file = fopen(buffer->filename, "w");
+ FILE *file = fopen(buffer->filename, "w");
if (file == NULL) {
minibuffer_echo("failed to open file %s for writing: %s", buffer->filename,
strerror(errno));
@@ -377,7 +456,19 @@ void buffer_to_file(struct buffer *buffer) {
fclose(file);
}
+void buffer_write_to(struct buffer *buffer, const char *filename) {
+ buffer->filename = strdup(filename);
+ buffer_to_file(buffer);
+}
+
int buffer_add_text(struct buffer *buffer, uint8_t *text, uint32_t nbytes) {
+ // invalidate last paste
+ g_kill_ring.paste_up_to_date = false;
+
+ /* If we currently have a selection active,
+ * replace it with the text to insert. */
+ maybe_delete_region(buffer);
+
uint32_t lines_added, cols_added;
text_insert_at(buffer->text, buffer->dot.line, buffer->dot.col, text, nbytes,
&lines_added, &cols_added);
@@ -434,9 +525,9 @@ void buffer_set_mark_at(struct buffer *buffer, uint32_t line, uint32_t col) {
struct cmdbuf {
struct command_list *cmds;
- uint32_t scroll_line;
+ struct buffer_location scroll;
uint32_t line_offset;
- uint32_t col_offset;
+ uint32_t left_margin;
uint32_t width;
struct region region;
@@ -447,16 +538,28 @@ struct cmdbuf {
};
void render_line(struct text_chunk *line, void *userdata) {
+
struct cmdbuf *cmdbuf = (struct cmdbuf *)userdata;
- uint32_t visual_line = line->line - cmdbuf->scroll_line + cmdbuf->line_offset;
+ uint32_t visual_line = line->line - cmdbuf->scroll.line + cmdbuf->line_offset;
+
for (uint32_t hooki = 0; hooki < cmdbuf->nlinerender_hooks; ++hooki) {
struct line_render_hook *hook = &cmdbuf->line_render_hooks[hooki];
hook->callback(line, visual_line, cmdbuf->cmds, hook->userdata);
}
+ uint32_t scroll_bytes =
+ utf8_nbytes(line->text, line->nbytes, cmdbuf->scroll.col);
+ uint8_t *text = line->text + scroll_bytes;
+ uint32_t text_nbytes =
+ scroll_bytes > line->nbytes ? 0 : line->nbytes - scroll_bytes;
+ uint32_t text_nchars =
+ scroll_bytes > line->nchars ? 0 : line->nchars - cmdbuf->scroll.col;
+
command_list_set_show_whitespace(cmdbuf->cmds, true);
struct buffer_location *begin = &cmdbuf->region.begin,
*end = &cmdbuf->region.end;
+
+ // should we draw region
if (cmdbuf->mark_set && line->line >= begin->line &&
line->line <= end->line) {
uint32_t byte_offset = 0;
@@ -464,15 +567,16 @@ void render_line(struct text_chunk *line, void *userdata) {
// draw any text on the line that should not be part of region
if (begin->line == line->line) {
- if (begin->col > 0) {
- uint32_t nbytes = utf8_nbytes(line->text, line->nbytes, begin->col);
- command_list_draw_text(cmdbuf->cmds, cmdbuf->col_offset, visual_line,
- line->text, nbytes);
+ if (begin->col > cmdbuf->scroll.col) {
+ uint32_t nbytes =
+ utf8_nbytes(text, text_nbytes, begin->col - cmdbuf->scroll.col);
+ command_list_draw_text(cmdbuf->cmds, cmdbuf->left_margin, visual_line,
+ text, nbytes);
byte_offset += nbytes;
}
- col_offset = begin->col;
+ col_offset = begin->col - cmdbuf->scroll.col;
}
// activate region color
@@ -480,38 +584,38 @@ void render_line(struct text_chunk *line, void *userdata) {
// draw any text on line that should be part of region
if (end->line == line->line) {
- if (end->col > 0) {
+ if (end->col > cmdbuf->scroll.col) {
uint32_t nbytes =
- utf8_nbytes(line->text + byte_offset, line->nbytes - byte_offset,
- end->col - col_offset);
- command_list_draw_text(cmdbuf->cmds, cmdbuf->col_offset + col_offset,
- visual_line, line->text + byte_offset, nbytes);
+ utf8_nbytes(text + byte_offset, text_nbytes - byte_offset,
+ end->col - col_offset - cmdbuf->scroll.col);
+ command_list_draw_text(cmdbuf->cmds, cmdbuf->left_margin + col_offset,
+ visual_line, text + byte_offset, nbytes);
byte_offset += nbytes;
}
- col_offset = end->col;
+ col_offset = end->col - cmdbuf->scroll.col;
command_list_reset_color(cmdbuf->cmds);
}
// draw rest of line
- if (line->nbytes - byte_offset > 0) {
- command_list_draw_text(cmdbuf->cmds, cmdbuf->col_offset + col_offset,
- visual_line, line->text + byte_offset,
- line->nbytes - byte_offset);
+ if (text_nbytes - byte_offset > 0) {
+ command_list_draw_text(cmdbuf->cmds, cmdbuf->left_margin + col_offset,
+ visual_line, text + byte_offset,
+ text_nbytes - byte_offset);
}
// done rendering region
command_list_reset_color(cmdbuf->cmds);
} else {
- command_list_draw_text(cmdbuf->cmds, cmdbuf->col_offset, visual_line,
- line->text, line->nbytes);
+ command_list_draw_text(cmdbuf->cmds, cmdbuf->left_margin, visual_line, text,
+ text_nbytes);
}
command_list_set_show_whitespace(cmdbuf->cmds, false);
- uint32_t col = line->nchars + cmdbuf->col_offset;
- for (uint32_t bytei = 0; bytei < line->nbytes; ++bytei) {
+ uint32_t col = text_nchars + cmdbuf->left_margin;
+ for (uint32_t bytei = scroll_bytes; bytei < line->nbytes; ++bytei) {
if (line->text[bytei] == '\t') {
col += 3;
} else if (utf8_byte_is_unicode_start(line->text[bytei])) {
@@ -522,30 +626,34 @@ void render_line(struct text_chunk *line, void *userdata) {
}
}
- if (cmdbuf->width > line->nchars) {
+ if (col < cmdbuf->width) {
command_list_draw_repeated(cmdbuf->cmds, col, visual_line, ' ',
- cmdbuf->width - col + cmdbuf->col_offset);
+ cmdbuf->width - col);
}
}
void scroll(struct buffer *buffer, int line_delta, int col_delta) {
uint32_t nlines = text_num_lines(buffer->text);
- int64_t new_line = (int64_t)buffer->scroll_line + line_delta;
+ int64_t new_line = (int64_t)buffer->scroll.line + line_delta;
if (new_line >= 0 && new_line < nlines) {
- buffer->scroll_line = (uint32_t)new_line;
+ buffer->scroll.line = (uint32_t)new_line;
+ } else if (new_line < 0) {
+ buffer->scroll.line = 0;
}
- int64_t new_col = (int64_t)buffer->scroll_col + col_delta;
+ int64_t new_col = (int64_t)buffer->scroll.col + col_delta;
if (new_col >= 0 &&
new_col < text_line_length(buffer->text, buffer->dot.line)) {
- buffer->scroll_col = (uint32_t)new_col;
+ buffer->scroll.col = (uint32_t)new_col;
+ } else if (new_col < 0) {
+ buffer->scroll.col = 0;
}
}
void to_relative(struct buffer *buffer, uint32_t line, uint32_t col,
int64_t *rel_line, int64_t *rel_col) {
- *rel_col = (int64_t)col - (int64_t)buffer->scroll_col;
- *rel_line = (int64_t)line - (int64_t)buffer->scroll_line;
+ *rel_col = (int64_t)col - (int64_t)buffer->scroll.col;
+ *rel_line = (int64_t)line - (int64_t)buffer->scroll.line;
}
uint32_t visual_dot_col(struct buffer *buffer, uint32_t dot_col) {
@@ -707,36 +815,36 @@ void buffer_update(struct buffer *buffer, uint32_t width, uint32_t height,
to_relative(buffer, buffer->dot.line, buffer->dot.col, &rel_line, &rel_col);
int line_delta = 0, col_delta = 0;
if (rel_line < 0) {
- line_delta = -(int)height / 2;
+ line_delta = rel_line - ((int)height / 2);
} else if (rel_line >= height) {
- line_delta = height / 2;
+ line_delta = (rel_line - height) + height / 2;
}
if (rel_col < 0) {
- col_delta = rel_col;
+ col_delta = rel_col - ((int)width / 2);
} else if (rel_col > width) {
- col_delta = rel_col - width;
+ col_delta = (rel_col - width) + width / 2;
}
scroll(buffer, line_delta, col_delta);
struct cmdbuf cmdbuf = (struct cmdbuf){
.cmds = commands,
- .scroll_line = buffer->scroll_line,
- .col_offset = total_margins.left,
- .width = width,
+ .scroll = buffer->scroll,
+ .left_margin = total_margins.left,
+ .width = total_width,
.line_offset = total_margins.top,
.line_render_hooks = line_hooks,
.nlinerender_hooks = nlinehooks,
.mark_set = buffer->mark_set,
.region = to_region(buffer->dot, buffer->mark),
};
- text_for_each_line(buffer->text, buffer->scroll_line, height, render_line,
+ text_for_each_line(buffer->text, buffer->scroll.line, height, render_line,
&cmdbuf);
// draw empty lines
uint32_t nlines = text_num_lines(buffer->text);
- for (uint32_t linei = nlines - buffer->scroll_line + total_margins.top;
+ for (uint32_t linei = nlines - buffer->scroll.line + total_margins.top;
linei < height; ++linei) {
command_list_draw_repeated(commands, 0, linei, ' ', total_width);
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-06 18:44:02 +0000