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Add rudimentary text search

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This commit is contained in:
K. Lange 2018-08-16 17:25:59 +09:00
parent 1bed29911e
commit 6eef68699d
1 changed files with 176 additions and 0 deletions
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176
apps/bim.c
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@ -55,6 +55,8 @@
#define COLOR_TAB_BG 248
#define COLOR_ERROR_FG 15
#define COLOR_ERROR_BG 196
#define COLOR_SEARCH_FG 234
#define COLOR_SEARCH_BG 226
/**
* Line buffer definitions
@ -131,6 +133,7 @@ typedef struct _env {
int line_count;
int line_avail;
int col_no;
char * search;
short modified;
short mode;
line_t ** lines;
@ -1621,6 +1624,172 @@ void command_mode(void) {
}
}
/**
* Search forward from the given cursor position
* to find a basic search match.
*
* This could be more complicated...
*/
void find_match(int from_line, int from_col, int * out_line, int * out_col, char * str) {
int col = from_col;
for (int i = from_line; i <= env->line_count; ++i) {
line_t * line = env->lines[i - 1];
int j = col - 1;
while (j < line->actual + 1) {
int k = j;
char * match = str;
while (k < line->actual + 1) {
if (*match == '\0') {
*out_line = i;
*out_col = j + 1;
return;
}
/* TODO search for UTF-8 sequences? */
if (*match != line->text[k].codepoint) break;
match++;
k++;
}
j++;
}
col = 0;
}
}
/**
* Draw the matched search result.
*/
void draw_search_match(int line, char * buffer, int redraw_buffer) {
place_cursor_actual();
redraw_text();
if (line != -1) {
/*
* TODO this should probably mark the relevant
* regions so that redraw_text can hilight it
*/
set_colors(COLOR_SEARCH_FG, COLOR_SEARCH_BG);
place_cursor_actual();
printf("%s", buffer);
}
redraw_statusbar();
redraw_commandline();
if (redraw_buffer) {
printf("/%s", buffer);
}
}
/**
* Search mode
*
* Search text for substring match.
*/
void search_mode(void) {
char c;
char buffer[1024] = {0};
int buffer_len = 0;
/* Remember where the cursor is so we can cancel */
int prev_line = env->line_no;
int prev_col = env->col_no;
int prev_coffset = env->coffset;
int prev_offset = env->offset;
redraw_commandline();
printf("/");
show_cursor();
while ((c = bim_getch())) {
if (c == -1) {
/* Time out */
continue;
}
if (c == '\033') {
/* Cancel search */
env->line_no = prev_line;
env->col_no = prev_col;
redraw_all();
break;
} else if (c == ENTER_KEY) {
/* Exit search */
if (env->search) {
free(env->search);
}
env->search = strdup(buffer);
break;
} else if (c == BACKSPACE_KEY) {
/* Backspace, delete last character in search buffer */
if (buffer_len > 0) {
buffer_len -= 1;
buffer[buffer_len] = '\0';
/* Search from beginning to find first match */
int line = -1, col = -1;
find_match(prev_line, prev_col, &line, &col, buffer);
if (line != -1) {
env->coffset = 0;
env->offset = line - 1;
env->col_no = col;
env->line_no = line;
}
draw_search_match(line, buffer, 1);
} else {
/* If backspaced through entire search term, cancel search */
redraw_commandline();
env->coffset = prev_coffset;
env->offset = prev_offset;
env->col_no = prev_col;
env->line_no = prev_line;
redraw_all();
break;
}
} else {
/* Regular character */
buffer[buffer_len] = c;
buffer_len++;
buffer[buffer_len] = '\0';
printf("%c", c);
/* Find the next search match */
int line = -1, col = -1;
find_match(prev_line, prev_col, &line, &col, buffer);
if (line != -1) {
env->coffset = 0;
env->offset = line - 1;
env->col_no = col;
env->line_no = line;
} else {
env->coffset = prev_coffset;
env->offset = prev_offset;
env->col_no = prev_col;
env->line_no = prev_line;
}
draw_search_match(line, buffer, 1);
}
show_cursor();
}
}
void search_next(void) {
if (!env->search) return;
int line = -1, col = -1;
find_match(env->line_no, env->col_no+1, &line, &col, env->search);
if (line == -1) {
find_match(1,1, &line, &col, env->search);
if (line == -1) return;
}
env->coffset = 0;
env->offset = line - 1;
env->col_no = col;
env->line_no = line;
draw_search_match(line, env->search, 0);
}
/**
* INSERT mode
*
@ -1818,6 +1987,13 @@ int main(int argc, char * argv[]) {
/* Switch to command mode */
command_mode();
break;
case '/':
/* Switch to search mode */
search_mode();
break;
case 'n':
search_next();
break;
case 'j':
cursor_down();
break;