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/* Copyright (C) 2021 June McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <err.h>
#include <regex.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
static void escape(FILE *file, const char *str, size_t len) {
for (size_t i = 0; i < len; ++i) {
if (str[i] == '\\' || str[i] == '/') {
putc('\\', file);
}
putc(str[i], file);
}
}
int main(int argc, char *argv[]) {
int error;
bool append = false;
const char *path = "tags";
for (int opt; 0 < (opt = getopt(argc, argv, "af:"));) {
switch (opt) {
break; case 'a': append = true;
break; case 'f': path = optarg;
break; default: return EX_USAGE;
}
}
FILE *tags = fopen(path, (append ? "a" : "w"));
if (!tags) err(EX_CANTCREAT, "%s", path);
#ifdef __OpenBSD__
error = pledge("stdio rpath", NULL);
if (error) err(EX_OSERR, "pledge");
#endif
regex_t makeFile, makeLine;
regex_t mdocFile, mdocLine;
regex_t shFile, shLine;
error = 0
|| regcomp(&makeFile, "(^|/)Makefile|[.]mk$", REG_EXTENDED | REG_NOSUB)
|| regcomp(
&makeLine,
"^([.][^:$A-Z][^:$[:space:]]*|[^.:$][^:$[:space:]]*):",
REG_EXTENDED
)
|| regcomp(&mdocFile, "[.][1-9]$", REG_EXTENDED | REG_NOSUB)
|| regcomp(&mdocLine, "^[.]S[hs] ([^\t\n]+)", REG_EXTENDED)
|| regcomp(
&shFile, "(^|/)[.](profile|shrc)|[.]sh$", REG_EXTENDED | REG_NOSUB
)
|| regcomp(&shLine, "^([_[:alnum:]]+)[[:blank:]]*[(][)]", REG_EXTENDED);
assert(!error);
size_t cap = 0;
char *buf = NULL;
for (int i = optind; i < argc; ++i) {
const regex_t *regex;
if (!regexec(&makeFile, argv[i], 0, NULL, 0)) {
regex = &makeLine;
} else if (!regexec(&mdocFile, argv[i], 0, NULL, 0)) {
regex = &mdocLine;
} else if (!regexec(&shFile, argv[i], 0, NULL, 0)) {
regex = &shLine;
} else {
warnx("skipping unknown file type %s", argv[i]);
continue;
}
FILE *file = fopen(argv[i], "r");
if (!file) err(EX_NOINPUT, "%s", argv[i]);
while (0 < getline(&buf, &cap, file)) {
regmatch_t match[2];
if (regexec(regex, buf, 2, match, 0)) continue;
fprintf(
tags, "%.*s\t%s\t/^",
(int)(match[1].rm_eo - match[1].rm_so), &buf[match[1].rm_so],
argv[i]
);
escape(tags, buf, match[0].rm_eo);
fprintf(tags, "/\n");
}
fclose(file);
}
}
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