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vi: allow ctrl-D to reduce indentation

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When whitespace has been automatically added to a new line due to
autoindent entering ctrl-D should reduce the level of indentation.

Implement an approximation of this by treating ctrl-D as backspace.
For the common case of indentation using tabs this is good enough.
My attempt at a full implementation was three times bigger.

function                                             old     new   delta
char_insert                                          476     531     +55
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 55/0)               Total: 55 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston 2021-04-15 12:03:58 +01:00 committed by Denys Vlasenko
parent d6e653d667
commit ac6495f6fb
1 changed files with 14 additions and 2 deletions
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16
editors/vi.c
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@ -2072,6 +2072,11 @@ static uintptr_t stupid_insert(char *p, char c) // stupidly insert the char c at
#endif
static char *char_insert(char *p, char c, int undo) // insert the char c at 'p'
{
#if ENABLE_FEATURE_VI_SETOPTS
char *q;
size_t len;
#endif
if (c == 22) { // Is this an ctrl-V?
p += stupid_insert(p, '^'); // use ^ to indicate literal next
refresh(FALSE); // show the ^
@ -2092,6 +2097,15 @@ static char *char_insert(char *p, char c, int undo) // insert the char c at 'p'
if ((p[-1] != '\n') && (dot > text)) {
p--;
}
#if ENABLE_FEATURE_VI_SETOPTS
} else if (c == 4 && autoindent) { // ctrl-D reduces indentation
q = begin_line(p);
len = strspn(q, " \t");
if (len && q + len == p) {
p--;
p = text_hole_delete(p, p, ALLOW_UNDO_QUEUED);
}
#endif
} else if (c == term_orig.c_cc[VERASE] || c == 8 || c == 127) { // Is this a BS
if (p > text) {
p--;
@ -2116,8 +2130,6 @@ static char *char_insert(char *p, char c, int undo) // insert the char c at 'p'
showmatching(p - 1);
}
if (autoindent && c == '\n') { // auto indent the new line
char *q;
size_t len;
q = prev_line(p); // use prev line as template
len = strspn(q, " \t"); // space or tab
if (len) {