The edit command already supports a few key bindings for code
navigation. To improve user experience for vi-impaired users, add a vi
alias that maps traditional vi key bindings to the barebox edit ones.
This is done by adding a mode-aware read_modal_key that maps vi
normal-mode keys to barebox edit's. For operations that requires more
than one barebox edit key, a backlog of two characters is additionally
used.
In interest of code size reduction, a command mode (and the associated
readline overhead) are not implemented, the effect of the most common
commands :q and :wq commands can be realized with vim-like ZQ and ZZ
bindings instead.
This increases the size of a compressed THUMB2 barebox by 733 bytes.
Signed-off-by: Ahmad Fatoum <ahmad@xxxxxx>
---
commands/edit.c | 148 +++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 139 insertions(+), 9 deletions(-)
diff --git a/commands/edit.c b/commands/edit.c
index 290222ce152f..0dc19841f351 100644
--- a/commands/edit.c
+++ b/commands/edit.c
@@ -378,8 +378,120 @@ static void getwinsize(void)
pos(0, 0);
}
+static inline void statusbar(const char *str)
+{
+ pos(0, screenheight+1);
+ printf("%*c\r", screenwidth, ' ');
+ printf(str);
+ pos(cursx, cursy);
+}
+
+static int read_modal_key(bool is_modal)
+{
+ static enum { MODE_INSERT, MODE_NORMAL } mode = MODE_NORMAL;
+ static int backlog[2] = { -1, -1 };
+ int c;
+
+ if (backlog[0] >= 0) {
+ /* pop a character */
+ c = backlog[0];
+ backlog[0] = backlog[1];
+ backlog[1] = -1;
+ } else {
+ c = read_key();
+ }
+
+ if (is_modal && mode == MODE_INSERT && (c == -1 || c == CTL_CH('c'))) {
+ mode = MODE_NORMAL;
+ statusbar("");
+ return -EAGAIN;
+ }
+
+ if (!is_modal || mode == MODE_INSERT)
+ return c;
+
+ switch (c) {
+ case -1: /* invalid escape, e.g. two escapes in a row */
+ break;
+ case 'i':
+ statusbar("-- INSERT --");
+ mode = MODE_INSERT;
+ break;
+ case 'h':
+ return BB_KEY_LEFT;
+ case 'j':
+ return BB_KEY_DOWN;
+ case 'k':
+ return BB_KEY_UP;
+ case 'a':
+ statusbar("-- INSERT --");
+ mode = MODE_INSERT;
+ /* fall through */
+ case 'l':
+ return BB_KEY_RIGHT;
+ case 'O':
+ backlog[0] = '\n';
+ backlog[1] = BB_KEY_UP;
+ /* fall through */
+ case 'I':
+ statusbar("-- INSERT --");
+ mode = MODE_INSERT;
+ /* fall through */
+ case '^':
+ case '0':
+ return BB_KEY_HOME;
+ case 'g':
+ c = read_key();
+ if (c != 'g')
+ break;
+ backlog[0] = CTL_CH('u');
+ backlog[1] = CTL_CH('u');
+ /* fall through */
+ case CTL_CH('u'):
+ return BB_KEY_PAGEUP;
+ case 'G':
+ backlog[0] = CTL_CH('d');
+ backlog[1] = CTL_CH('d');
+ /* fall through */
+ case CTL_CH('d'):
+ return BB_KEY_PAGEDOWN;
+ case 'o':
+ backlog[0] = '\n';
+ /* fall through */
+ case 'A':
+ statusbar("-- INSERT --");
+ mode = MODE_INSERT;
+ /* fall through */
+ case '$':
+ return BB_KEY_END;
+ case CTL_CH('c'):
+ statusbar("Type ZQ to abandon all changes and exit vi."
+ "Type ZZ to exit whilesaving them.");
+ break;
+ case ':':
+ statusbar("ERROR: command mode not supported");
+ break;
+ case 'Z':
+ c = read_key();
+ if (c == 'Z')
+ return CTL_CH('d');
+ if (c == 'Q')
+ return CTL_CH('c');
+ case 'x':
+ return BB_KEY_DEL;
+ case 'X':
+ return '\b';
+ default:
+ statusbar("ERROR: not implemented");
+ break;
+ }
+
+ return -EAGAIN;
+}
+
static int do_edit(int argc, char *argv[])
{
+ bool is_vi = false;
int lastscrcol;
int i;
int linepos;
@@ -401,10 +513,14 @@ static int do_edit(int argc, char *argv[])
else
screenheight = 25;
- /* check if we are called as "sedit" instead of "edit" */
- if (*argv[0] == 's') {
+ /* check if we are not called as "edit" */
+ if (*argv[0] != 'e') {
smartscroll = 1;
getwinsize();
+
+ /* check if we are called as "vi" */
+ if (*argv[0] == 'v')
+ is_vi = true;
}
buffer = NULL;
@@ -424,14 +540,24 @@ static int do_edit(int argc, char *argv[])
pos(0, -1);
- printf("%c[7m %-25s <ctrl-d>: Save and quit <ctrl-c>: quit %c[0m",
- 27, argv[1], 27);
- printf("%c[2;%dr", 27, screenheight);
-
- screenheight--; /* status line */
+ if (is_vi) {
+ screenheight -= 2;
+ printf("%c[7m%*c%c[0m", 27, screenwidth , ' ', 27);
+ pos(0, screenheight-1);
+ printf("%c[7m%*c%c[0m", 27, screenwidth , ' ', 27);
+ printf("\r%c[7m%-25s%c[0m", 27, argv[1], 27);
+ printf("%c[2;%dr", 27, screenheight);
+ } else {
+ pos(0, -1);
+ printf("%c[7m %-25s <ctrl-d>: Save and quit <ctrl-c>: quit %c[0m",
+ 27, argv[1], 27);
+ printf("%c[2;%dr", 27, screenheight);
+ }
pos(0, 0);
+ screenheight--; /* status line */
+
refresh(1);
while (1) {
@@ -469,7 +595,11 @@ static int do_edit(int argc, char *argv[])
lastscrline = scrline;
pos(cursx, cursy);
- c = read_key();
+again:
+ c = read_modal_key(is_vi);
+ if (c == -EAGAIN)
+ goto again;
+
switch (c) {
case BB_KEY_UP:
if (!curline->prev)
@@ -559,7 +689,7 @@ out:
return ret;
}
-static const char * const edit_aliases[] = { "sedit", NULL};
+static const char * const edit_aliases[] = { "sedit", "vi", NULL};
BAREBOX_CMD_HELP_START(edit)
BAREBOX_CMD_HELP_TEXT("Use cursor keys, Ctrl-C to exit and Ctrl-D to exit-with-save.")
--
2.20.1
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
