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vi: improvements to character search within line

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- Use a common routine to handle all commands to search for a
  character in a line.

- When searching for the nth occurrence of a character don't move
  the cursor if fewer than n occurrences are present.

- Add support for the 'T' command, search backwards for character
  after next occurrence of given character.

function                                             old     new   delta
do_cmd                                              4861    4805     -56
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-56)             Total: -56 bytes

v2: Add parentheses to avoid searches continuing past end of line.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston 2021-03-28 17:15:30 +01:00 committed by Denys Vlasenko
parent 50a2db7dff
commit 15f4ac3ca9
1 changed files with 39 additions and 41 deletions
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80
editors/vi.c
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@ -322,7 +322,8 @@ struct globals {
char *screen; // pointer to the virtual screen buffer
int screensize; // and its size
int tabstop;
int last_forward_char; // last char searched for with 'f' (int because of Unicode)
int last_search_char; // last char searched for (int because of Unicode)
smallint last_search_cmd; // command used to invoke last char search
#if ENABLE_FEATURE_VI_CRASHME
char last_input_char; // last char read from user
#endif
@ -439,7 +440,8 @@ struct globals {
#define screensize (G.screensize )
#define screenbegin (G.screenbegin )
#define tabstop (G.tabstop )
#define last_forward_char (G.last_forward_char )
#define last_search_char (G.last_search_char )
#define last_search_cmd (G.last_search_cmd )
#if ENABLE_FEATURE_VI_CRASHME
#define last_input_char (G.last_input_char )
#endif
@ -1772,6 +1774,31 @@ static void dot_skip_over_ws(void)
dot++;
}
static void dot_to_char(int cmd)
{
char *q = dot;
int dir = islower(cmd) ? FORWARD : BACK;
if (last_search_char == 0)
return;
do {
do {
q += dir;
if ((dir == FORWARD ? q > end - 1 : q < text) || *q == '\n')
return;
} while (*q != last_search_char);
} while (--cmdcnt > 0);
dot = q;
// place cursor before/after char as required
if (cmd == 't')
dot_left();
else if (cmd == 'T')
dot_right();
}
static void dot_scroll(int cnt, int dir)
{
char *q;
@ -3181,11 +3208,9 @@ static void do_cmd(int c)
//case '*': // *-
//case '=': // =-
//case '@': // @-
//case 'F': // F-
//case 'K': // K-
//case 'Q': // Q-
//case 'S': // S-
//case 'T': // T-
//case 'V': // V-
//case '[': // [-
//case '\\': // \-
@ -3379,36 +3404,16 @@ static void do_cmd(int c)
indicate_error();
break;
case 'f': // f- forward to a user specified char
last_forward_char = get_one_char(); // get the search char
//
// dont separate these two commands. 'f' depends on ';'
//
//**** fall through to ... ';'
case ';': // ;- look at rest of line for last forward char
do {
if (last_forward_char == 0)
break;
q = dot + 1;
while (q < end - 1 && *q != '\n' && *q != last_forward_char) {
q++;
}
if (*q == last_forward_char)
dot = q;
} while (--cmdcnt > 0);
case 'F': // F- backward to a user specified char
case 't': // t- move to char prior to next x
case 'T': // T- move to char after previous x
last_search_char = get_one_char(); // get the search char
last_search_cmd = c;
// fall through
case ';': // ;- look at rest of line for last search char
case ',': // ,- repeat latest search in opposite direction
dot_to_char(c != ',' ? last_search_cmd : last_search_cmd ^ 0x20);
break;
case ',': // repeat latest 'f' in opposite direction
if (last_forward_char == 0)
break;
do {
q = dot - 1;
while (q >= text && *q != '\n' && *q != last_forward_char) {
q--;
}
if (q >= text && *q == last_forward_char)
dot = q;
} while (--cmdcnt > 0);
break;
case '-': // -- goto prev line
do {
dot_prev();
@ -3854,13 +3859,6 @@ static void do_cmd(int c)
}
end_cmd_q(); // stop adding to q
break;
case 't': // t- move to char prior to next x
last_forward_char = get_one_char();
do_cmd(';');
if (*dot == last_forward_char)
dot_left();
last_forward_char = 0;
break;
case 'w': // w- forward a word
do {
if (isalnum(*dot) || *dot == '_') { // we are on ALNUM
@ -4204,7 +4202,7 @@ static void edit_file(char *fn)
mark[26] = mark[27] = text; // init "previous context"
#endif
last_forward_char = '\0';
last_search_char = '\0';
#if ENABLE_FEATURE_VI_CRASHME
last_input_char = '\0';
#endif