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/* Copyright 2007, 2008 Peter Klausler. See COPYING for license. */
#include "all.h"
/* TAGS file searching */
static char *extract_id(struct view *view)
{
Unicode_t ch;
position_t at = locus_get(view, CURSOR), next;
char *id;
if (is_idch((ch = view_char(view, at, &next))) ||
ch == ':' && view_char(view, next, NULL) == ':')
locus_set(view, CURSOR, at = find_id_end(view, at));
locus_set(view, MARK, find_id_start(view, at));
id = view_extract_selection(view);
locus_set(view, MARK, UNSET);
return id;
}
static struct view *find_TAGS(struct view *view, struct view *tags)
{
const char *currpath = (tags ? tags : view)->text->path;
char *path = allocate(strlen(currpath) + 8);
char *slash;
strcpy(path, currpath);
if (tags) {
view_close(tags);
slash = strrchr(path, '/');
if (slash)
*slash = '\0';
}
for (; (slash = strrchr(path, '/')); *slash = '\0') {
strcpy(slash+1, "TAGS");
if (!access(path, R_OK)) {
tags = view_open(path);
if (tags && !(tags->text->flags & TEXT_CREATED)) {
RELEASE(path);
return tags;
}
view_close(tags);
}
}
RELEASE(path);
return NULL;
}
static sposition_t find_id_in_TAGS(struct view *tags, const char *id)
{
position_t first = 0;
position_t last = tags->bytes;
position_t at, wordstart, wordend;
sposition_t result = -1;
char *this;
int cmp;
while (first < last) {
at = find_line_start(tags, first + last >> 1);
if (at < first)
at = find_line_end(tags, at) + 1;
if (at >= last)
break;
wordstart = find_nonspace(tags, at);
wordend = find_space(tags, wordstart);
this = view_extract(tags, wordstart, wordend - wordstart);
if (!this)
break;
cmp = strcmp(id, this);
RELEASE(this);
if (!cmp)
result = wordend;
if (cmp <= 0)
last = at;
else
first = find_line_end(tags, at) + 1;
}
return result; /* failure */
}
static sposition_t find_next_id_in_TAGS(struct view *tags, const char *id,
position_t prevend)
{
position_t wordstart = find_nonspace(tags,
find_line_end(tags, prevend) + 1);
position_t wordend = find_space(tags, wordstart);
char *this = view_extract(tags, wordstart, wordend - wordstart);
int cmp;
if (!this)
return -1;
cmp = strcmp(id, this);
RELEASE(this);
return cmp ? -1 : wordend;
}
static struct view *show_tag(struct view *tags, sposition_t wordend,
const char *id)
{
position_t wordstart, linestart;
char *this, *path, *slash;
int line;
struct view *view;
sposition_t at;
if (wordend < 0)
return NULL;
wordstart = find_nonspace(tags, wordend); /* line number */
wordend = find_space(tags, wordstart);
this = view_extract(tags, wordstart, wordend - wordstart);
if (!isdigit(*this)) {
/* exuberant-ctags puts a classifier before the line number */
RELEASE(this);
wordstart = find_nonspace(tags, wordend); /* line number */
wordend = find_space(tags, wordstart);
this = view_extract(tags, wordstart, wordend - wordstart);
if (!isdigit(*this)) {
RELEASE(this);
return NULL;
}
}
line = atoi(this);
RELEASE(this);
wordstart = find_nonspace(tags, wordend); /* file name */
wordend = find_space(tags, wordstart);
this = view_extract(tags, wordstart, wordend - wordstart);
if (*this == '/')
path = this;
else {
path = allocate(strlen(tags->text->path) + strlen(this) + 8);
strcpy(path, tags->text->path);
if (!(slash = strrchr(path, '/')))
*(slash = path + strlen(path)) = '/';
strcpy(slash + 1, this);
RELEASE(this);
}
view = view_open(path);
if (!view)
message("Could not open %s from TAGS", path);
RELEASE(path);
if (!view || view->text->flags & TEXT_CREATED) {
view_close(view);
return FALSE;
}
linestart = find_line_number(view, line);
at = find_string(view, id, linestart);
if (at >= 0) {
locus_set(view, CURSOR, at);
locus_set(view, MARK, at + strlen(id));
} else {
locus_set(view, CURSOR, linestart);
locus_set(view, MARK, UNSET);
}
return view;
}
static Boolean_t show_tags(struct view *tags, struct view *view,
const char *id)
{
sposition_t wordend = find_id_in_TAGS(tags, id);
struct view *new_view = show_tag(tags, wordend, id);
struct view *top_view;
if (!new_view)
return FALSE;
window_below(view, top_view = new_view, 4);
while ((wordend = find_next_id_in_TAGS(tags, id, wordend)) >= 0)
if ((new_view = show_tag(tags, wordend, id)))
window_below(view, top_view = new_view, 4);
window_activate(top_view);
return TRUE;
}
void find_tag(struct view *view)
{
struct view *tags = NULL;
char *id;
if (locus_get(view, MARK) != UNSET) {
id = view_extract_selection(view);
view_delete_selection(view);
} else
id = extract_id(view);
if (!id) {
window_beep(view);
return;
}
if (!(tags = find_TAGS(view, NULL))) {
message("No readable TAGS file found.");
RELEASE(id);
return;
}
do {
if (show_tags(tags, view, id)) {
view_close(tags);
RELEASE(id);
return;
}
} while ((tags = find_TAGS(view, tags)));
errno = 0;
message("couldn't find tag %s", id);
RELEASE(id);
}
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