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| author | Ron Yorston | 2021-04-15 12:03:58 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2021-04-15 13:09:12 +0200 |
| commit | ac6495f6fbb97cb59ccd0a6744660346fd9b80b3 (patch) | |
| tree | eb4bf13d5b3f9fda9e1fe0c8c658d2d9d5a8eeaa /editors/vi.c | |
| parent | d6e653d667bc1eb343014508a8bddb3dd4945f78 (diff) | |
| download | busybox-ac6495f6fbb97cb59ccd0a6744660346fd9b80b3.zip busybox-ac6495f6fbb97cb59ccd0a6744660346fd9b80b3.tar.gz | |
vi: allow ctrl-D to reduce indentation
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>
Diffstat (limited to 'editors/vi.c')
| -rw-r--r-- | editors/vi.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/editors/vi.c b/editors/vi.c index 780c812..0a82f9e 100644 --- a/editors/vi.c +++ b/editors/vi.c @@ -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) { |