support line-by-line undo in text mode - gramscii - A simple editor for ASCII box-and-arrow charts
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---
(DIR) commit 7f6e62f77bca73e49dfa260ff7ac75770d1363c8
(DIR) parent f3100ddd486d6f39b0c97c9c492bb6020bf3caf1
(HTM) Author: KatolaZ <katolaz@freaknet.org>
Date: Wed, 31 Jul 2019 11:49:06 +0100
support line-by-line undo in text mode
Diffstat:
M draw.c | 7 +++++++
M gramscii.1 | 6 +++---
M gramscii.h | 5 +++--
M lineset.c | 5 +++++
4 files changed, 18 insertions(+), 5 deletions(-)
---
(DIR) diff --git a/draw.c b/draw.c
@@ -77,10 +77,13 @@ void get_text(FILE *fc){
int orig_x = x;
redraw();
+ copy_lines_to_ring(y, y, PRV_STATE);
while((c=fgetc(fc))!=EOF && c != 27){
if(c=='\n'){
set_cur(BG);
+ copy_lines_to_ring(y,y, NEW_STATE);
y += 1;
+ copy_lines_to_ring(y, y, PRV_STATE);
x = orig_x;
}
else {
@@ -95,6 +98,8 @@ void get_text(FILE *fc){
status_bar();
show_cursor();
}
+ if (modified)
+ copy_lines_to_ring(y, y, NEW_STATE);
mode=MOVE;
}
@@ -245,6 +250,7 @@ update_arrow:
show_cursor();
}
if (c == 'a' || c == '\n'){
+ invalidate_undo();
draw_arrow(orig_x, orig_y, arrow, arrow_len, FIX);
modified = 1;
}
@@ -278,6 +284,7 @@ void erase(FILE *fc){
int orig_x = x, orig_y = y;
status_bar();
show_cursor();
+ invalidate_undo();
while((c=fgetc(fc))!=EOF && c!=27 && c!= 'x' && c != '\n'){
if (!move_around(c, fc)) continue;
check_bound();
(DIR) diff --git a/gramscii.1 b/gramscii.1
@@ -534,10 +534,10 @@ gramscii currently manages only a fixed screen of the same size of the
screen where it starts from. This will be changed in a future release to
support scrolling and "virtual" screens of any (reasonable) size.
.PP
-gramscii currently does
+Undo commands are only available in box, visual (cut, fill), and text
+mode, and for copy/paste operations. gramscii currently does
.B not
-support "undo" commands for arrow, text, and erase mode. This will be
-added soon.
+support undo commands for arrow and erase mode. This will be fixed soon.
.SH AUTHORS
gramscii is written and maintained by Vincenzo "KatolaZ" Nicosia
<katolaz@freaknet.org>. You can use, copy, modify, and redistribute
(DIR) diff --git a/gramscii.h b/gramscii.h
@@ -149,6 +149,8 @@ void get_arrow(FILE *fc);
void erase(FILE *fc);
void visual_box(FILE *fc);
void paste();
+void undo_change();
+void redo_change();
/** file-related functions **/
void write_file(FILE *fc);
@@ -165,7 +167,6 @@ void ensure_num_lines(lineset_t *ls, int n);
void yank_region(int x1, int y1, int x2, int y2);
void paste_region(int x1, int y1);
void copy_lines_to_ring(int y1, int y2, int which);
-void undo_change();
-void redo_change();
+void invalidate_undo();
#endif
(DIR) diff --git a/lineset.c b/lineset.c
@@ -171,3 +171,8 @@ void copy_lines_to_ring(int y1, int y2, int which){
}
#endif
}
+
+void invalidate_undo(){
+ if (undo_lst > undo_cur)
+ undo_lst = undo_cur;
+}