612 lines
14 KiB
C
612 lines
14 KiB
C
/*
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* Builtin "git grep"
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*
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* Copyright (c) 2006 Junio C Hamano
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*/
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#include "cache.h"
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#include "blob.h"
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#include "tree.h"
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#include "commit.h"
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#include "tag.h"
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#include "tree-walk.h"
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#include "builtin.h"
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#include <regex.h>
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#include <fnmatch.h>
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/*
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* git grep pathspecs are somewhat different from diff-tree pathspecs;
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* pathname wildcards are allowed.
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*/
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static int pathspec_matches(const char **paths, const char *name)
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{
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int namelen, i;
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if (!paths || !*paths)
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return 1;
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namelen = strlen(name);
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for (i = 0; paths[i]; i++) {
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const char *match = paths[i];
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int matchlen = strlen(match);
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const char *slash, *cp;
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if ((matchlen <= namelen) &&
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!strncmp(name, match, matchlen) &&
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(match[matchlen-1] == '/' ||
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name[matchlen] == '\0' || name[matchlen] == '/'))
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return 1;
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if (!fnmatch(match, name, 0))
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return 1;
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if (name[namelen-1] != '/')
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continue;
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/* We are being asked if the name directory is worth
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* descending into.
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*
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* Find the longest leading directory name that does
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* not have metacharacter in the pathspec; the name
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* we are looking at must overlap with that directory.
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*/
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for (cp = match, slash = NULL; cp - match < matchlen; cp++) {
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char ch = *cp;
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if (ch == '/')
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slash = cp;
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if (ch == '*' || ch == '[')
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break;
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}
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if (!slash)
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slash = match; /* toplevel */
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else
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slash++;
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if (namelen <= slash - match) {
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/* Looking at "Documentation/" and
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* the pattern says "Documentation/howto/", or
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* "Documentation/diff*.txt".
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*/
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if (!memcmp(match, name, namelen))
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return 1;
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}
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else {
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/* Looking at "Documentation/howto/" and
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* the pattern says "Documentation/h*".
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*/
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if (!memcmp(match, name, slash - match))
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return 1;
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}
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}
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return 0;
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}
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struct grep_pat {
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struct grep_pat *next;
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const char *pattern;
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regex_t regexp;
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};
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struct grep_opt {
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struct grep_pat *pattern_list;
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struct grep_pat **pattern_tail;
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regex_t regexp;
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unsigned linenum:1;
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unsigned invert:1;
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unsigned name_only:1;
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unsigned count:1;
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unsigned word_regexp:1;
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int regflags;
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unsigned pre_context;
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unsigned post_context;
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};
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static void add_pattern(struct grep_opt *opt, const char *pat)
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{
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struct grep_pat *p = xcalloc(1, sizeof(*p));
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p->pattern = pat;
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*opt->pattern_tail = p;
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opt->pattern_tail = &p->next;
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p->next = NULL;
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}
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static void compile_patterns(struct grep_opt *opt)
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{
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struct grep_pat *p;
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for (p = opt->pattern_list; p; p = p->next) {
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int err = regcomp(&p->regexp, p->pattern, opt->regflags);
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if (err) {
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char errbuf[1024];
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regerror(err, &p->regexp, errbuf, 1024);
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regfree(&p->regexp);
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die("'%s': %s", p->pattern, errbuf);
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}
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}
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}
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static char *end_of_line(char *cp, unsigned long *left)
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{
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unsigned long l = *left;
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while (l && *cp != '\n') {
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l--;
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cp++;
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}
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*left = l;
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return cp;
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}
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static int word_char(char ch)
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{
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return isalnum(ch) || ch == '_';
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}
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static void show_line(struct grep_opt *opt, const char *bol, const char *eol,
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const char *name, unsigned lno, char sign)
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{
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printf("%s%c", name, sign);
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if (opt->linenum)
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printf("%d%c", lno, sign);
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printf("%.*s\n", (int)(eol-bol), bol);
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}
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static int grep_buffer(struct grep_opt *opt, const char *name,
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char *buf, unsigned long size)
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{
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char *bol = buf;
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unsigned long left = size;
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unsigned lno = 1;
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struct pre_context_line {
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char *bol;
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char *eol;
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} *prev = NULL, *pcl;
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unsigned last_hit = 0;
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unsigned last_shown = 0;
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const char *hunk_mark = "";
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unsigned count = 0;
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if (opt->pre_context)
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prev = xcalloc(opt->pre_context, sizeof(*prev));
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if (opt->pre_context || opt->post_context)
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hunk_mark = "--\n";
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while (left) {
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regmatch_t pmatch[10];
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char *eol, ch;
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int hit = 0;
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struct grep_pat *p;
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eol = end_of_line(bol, &left);
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ch = *eol;
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*eol = 0;
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for (p = opt->pattern_list; p; p = p->next) {
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regex_t *exp = &p->regexp;
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hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
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pmatch, 0);
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if (hit && opt->word_regexp) {
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/* Match beginning must be either
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* beginning of the line, or at word
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* boundary (i.e. the last char must
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* not be alnum or underscore).
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*/
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if ((pmatch[0].rm_so < 0) ||
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(eol - bol) <= pmatch[0].rm_so ||
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(pmatch[0].rm_eo < 0) ||
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(eol - bol) < pmatch[0].rm_eo)
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die("regexp returned nonsense");
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if (pmatch[0].rm_so != 0 &&
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word_char(bol[pmatch[0].rm_so-1]))
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continue; /* not a word boundary */
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if ((eol-bol) < pmatch[0].rm_eo &&
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word_char(bol[pmatch[0].rm_eo]))
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continue; /* not a word boundary */
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}
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if (hit)
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break;
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}
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/* "grep -v -e foo -e bla" should list lines
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* that do not have either, so inversion should
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* be done outside.
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*/
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if (opt->invert)
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hit = !hit;
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if (hit) {
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count++;
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if (opt->name_only) {
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printf("%s\n", name);
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return 1;
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}
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/* Hit at this line. If we haven't shown the
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* pre-context lines, we would need to show them.
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* When asked to do "count", this still show
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* the context which is nonsense, but the user
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* deserves to get that ;-).
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*/
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if (opt->pre_context) {
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unsigned from;
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if (opt->pre_context < lno)
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from = lno - opt->pre_context;
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else
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from = 1;
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if (from <= last_shown)
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from = last_shown + 1;
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if (last_shown && from != last_shown + 1)
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printf(hunk_mark);
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while (from < lno) {
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pcl = &prev[lno-from-1];
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show_line(opt, pcl->bol, pcl->eol,
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name, from, '-');
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from++;
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}
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last_shown = lno-1;
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}
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if (last_shown && lno != last_shown + 1)
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printf(hunk_mark);
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if (!opt->count)
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show_line(opt, bol, eol, name, lno, ':');
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last_shown = last_hit = lno;
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}
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else if (last_hit &&
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lno <= last_hit + opt->post_context) {
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/* If the last hit is within the post context,
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* we need to show this line.
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*/
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if (last_shown && lno != last_shown + 1)
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printf(hunk_mark);
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show_line(opt, bol, eol, name, lno, '-');
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last_shown = lno;
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}
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if (opt->pre_context) {
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memmove(prev+1, prev,
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(opt->pre_context-1) * sizeof(*prev));
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prev->bol = bol;
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prev->eol = eol;
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}
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*eol = ch;
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bol = eol + 1;
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left--;
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lno++;
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}
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/* NEEDSWORK:
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* The real "grep -c foo *.c" gives many "bar.c:0" lines,
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* which feels mostly useless but sometimes useful. Maybe
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* make it another option? For now suppress them.
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*/
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if (opt->count && count)
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printf("%s:%u\n", name, count);
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return !!last_hit;
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}
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static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name)
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{
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unsigned long size;
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char *data;
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char type[20];
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int hit;
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data = read_sha1_file(sha1, type, &size);
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if (!data) {
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error("'%s': unable to read %s", name, sha1_to_hex(sha1));
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return 0;
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}
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hit = grep_buffer(opt, name, data, size);
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free(data);
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return hit;
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}
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static int grep_file(struct grep_opt *opt, const char *filename)
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{
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struct stat st;
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int i;
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char *data;
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if (lstat(filename, &st) < 0) {
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err_ret:
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if (errno != ENOENT)
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error("'%s': %s", filename, strerror(errno));
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return 0;
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}
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if (!st.st_size)
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return 0; /* empty file -- no grep hit */
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if (!S_ISREG(st.st_mode))
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return 0;
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i = open(filename, O_RDONLY);
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if (i < 0)
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goto err_ret;
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data = xmalloc(st.st_size + 1);
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if (st.st_size != xread(i, data, st.st_size)) {
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error("'%s': short read %s", filename, strerror(errno));
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close(i);
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free(data);
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return 0;
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}
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close(i);
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i = grep_buffer(opt, filename, data, st.st_size);
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free(data);
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return i;
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}
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static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
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{
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int hit = 0;
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int nr;
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read_cache();
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for (nr = 0; nr < active_nr; nr++) {
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struct cache_entry *ce = active_cache[nr];
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if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
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continue;
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if (!pathspec_matches(paths, ce->name))
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continue;
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if (cached)
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hit |= grep_sha1(opt, ce->sha1, ce->name);
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else
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hit |= grep_file(opt, ce->name);
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}
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return hit;
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}
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static int grep_tree(struct grep_opt *opt, const char **paths,
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struct tree_desc *tree,
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const char *tree_name, const char *base)
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{
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unsigned mode;
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int len;
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int hit = 0;
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const char *path;
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const unsigned char *sha1;
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char *down;
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char *path_buf = xmalloc(PATH_MAX + strlen(tree_name) + 100);
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if (tree_name[0]) {
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int offset = sprintf(path_buf, "%s:", tree_name);
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down = path_buf + offset;
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strcat(down, base);
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}
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else {
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down = path_buf;
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strcpy(down, base);
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}
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len = strlen(path_buf);
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while (tree->size) {
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int pathlen;
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sha1 = tree_entry_extract(tree, &path, &mode);
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pathlen = strlen(path);
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strcpy(path_buf + len, path);
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if (S_ISDIR(mode))
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/* Match "abc/" against pathspec to
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* decide if we want to descend into "abc"
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* directory.
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*/
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strcpy(path_buf + len + pathlen, "/");
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if (!pathspec_matches(paths, down))
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;
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else if (S_ISREG(mode))
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hit |= grep_sha1(opt, sha1, path_buf);
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else if (S_ISDIR(mode)) {
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char type[20];
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struct tree_desc sub;
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void *data;
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data = read_sha1_file(sha1, type, &sub.size);
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if (!data)
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die("unable to read tree (%s)",
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sha1_to_hex(sha1));
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sub.buf = data;
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hit |= grep_tree(opt, paths, &sub, tree_name, down);
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free(data);
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}
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update_tree_entry(tree);
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}
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return hit;
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}
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static int grep_object(struct grep_opt *opt, const char **paths,
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struct object *obj, const char *name)
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{
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if (!strcmp(obj->type, blob_type))
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return grep_sha1(opt, obj->sha1, name);
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if (!strcmp(obj->type, commit_type) ||
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!strcmp(obj->type, tree_type)) {
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struct tree_desc tree;
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void *data;
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int hit;
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data = read_object_with_reference(obj->sha1, tree_type,
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&tree.size, NULL);
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if (!data)
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die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
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tree.buf = data;
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hit = grep_tree(opt, paths, &tree, name, "");
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free(data);
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return hit;
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}
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die("unable to grep from object of type %s", obj->type);
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}
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static const char builtin_grep_usage[] =
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"git-grep <option>* <rev>* [-e] <pattern> [<path>...]";
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int cmd_grep(int argc, const char **argv, char **envp)
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{
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int hit = 0;
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int no_more_flags = 0;
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int seen_noncommit = 0;
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int cached = 0;
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struct grep_opt opt;
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struct object_list *list, **tail, *object_list = NULL;
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const char *prefix = setup_git_directory();
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const char **paths = NULL;
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memset(&opt, 0, sizeof(opt));
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opt.pattern_tail = &opt.pattern_list;
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opt.regflags = REG_NEWLINE;
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/*
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* No point using rev_info, really.
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*/
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while (1 < argc) {
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const char *arg = argv[1];
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argc--; argv++;
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if (!strcmp("--cached", arg)) {
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cached = 1;
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continue;
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}
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if (!strcmp("-i", arg) ||
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!strcmp("--ignore-case", arg)) {
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opt.regflags |= REG_ICASE;
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continue;
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}
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if (!strcmp("-v", arg) ||
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!strcmp("--invert-match", arg)) {
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opt.invert = 1;
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continue;
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}
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if (!strcmp("-E", arg) ||
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!strcmp("--extended-regexp", arg)) {
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opt.regflags |= REG_EXTENDED;
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continue;
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}
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if (!strcmp("-G", arg) ||
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!strcmp("--basic-regexp", arg)) {
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opt.regflags &= ~REG_EXTENDED;
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continue;
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}
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if (!strcmp("-n", arg)) {
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opt.linenum = 1;
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continue;
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}
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if (!strcmp("-H", arg)) {
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/* We always show the pathname, so this
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* is a noop.
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*/
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continue;
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}
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if (!strcmp("-l", arg) ||
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!strcmp("--files-with-matches", arg)) {
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opt.name_only = 1;
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continue;
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}
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if (!strcmp("-c", arg) ||
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!strcmp("--count", arg)) {
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opt.count = 1;
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continue;
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}
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if (!strcmp("-w", arg) ||
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!strcmp("--word-regexp", arg)) {
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opt.word_regexp = 1;
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continue;
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}
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if (!strncmp("-A", arg, 2) ||
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!strncmp("-B", arg, 2) ||
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!strncmp("-C", arg, 2) ||
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(arg[0] == '-' && '1' <= arg[1] && arg[1] <= '9')) {
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unsigned num;
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const char *scan;
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switch (arg[1]) {
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case 'A': case 'B': case 'C':
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if (!arg[2]) {
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if (argc <= 1)
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usage(builtin_grep_usage);
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scan = *++argv;
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argc--;
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}
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else
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scan = arg + 2;
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break;
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default:
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scan = arg + 1;
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break;
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}
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if (sscanf(scan, "%u", &num) != 1)
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usage(builtin_grep_usage);
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switch (arg[1]) {
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case 'A':
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opt.post_context = num;
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break;
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default:
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case 'C':
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opt.post_context = num;
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case 'B':
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opt.pre_context = num;
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break;
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}
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continue;
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}
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if (!strcmp("-e", arg)) {
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if (1 < argc) {
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add_pattern(&opt, argv[1]);
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argv++;
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argc--;
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continue;
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}
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usage(builtin_grep_usage);
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}
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if (!strcmp("--", arg)) {
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no_more_flags = 1;
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continue;
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}
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/* Either unrecognized option or a single pattern */
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if (!no_more_flags && *arg == '-')
|
|
usage(builtin_grep_usage);
|
|
if (!opt.pattern_list) {
|
|
add_pattern(&opt, arg);
|
|
break;
|
|
}
|
|
else {
|
|
/* We are looking at the first path or rev;
|
|
* it is found at argv[0] after leaving the
|
|
* loop.
|
|
*/
|
|
argc++; argv--;
|
|
break;
|
|
}
|
|
}
|
|
if (!opt.pattern_list)
|
|
die("no pattern given.");
|
|
compile_patterns(&opt);
|
|
tail = &object_list;
|
|
while (1 < argc) {
|
|
struct object *object;
|
|
struct object_list *elem;
|
|
const char *arg = argv[1];
|
|
unsigned char sha1[20];
|
|
if (get_sha1(arg, sha1) < 0)
|
|
break;
|
|
object = parse_object(sha1);
|
|
if (!object)
|
|
die("bad object %s", arg);
|
|
elem = object_list_insert(object, tail);
|
|
elem->name = arg;
|
|
tail = &elem->next;
|
|
argc--; argv++;
|
|
}
|
|
if (1 < argc)
|
|
paths = get_pathspec(prefix, argv + 1);
|
|
else if (prefix) {
|
|
paths = xcalloc(2, sizeof(const char *));
|
|
paths[0] = prefix;
|
|
paths[1] = NULL;
|
|
}
|
|
|
|
if (!object_list)
|
|
return !grep_cache(&opt, paths, cached);
|
|
/*
|
|
* Do not walk "grep -e foo master next pu -- Documentation/"
|
|
* but do walk "grep -e foo master..next -- Documentation/".
|
|
* Ranged request mixed with a blob or tree object, like
|
|
* "grep -e foo v1.0.0:Documentation/ master..next"
|
|
* so detect that and complain.
|
|
*/
|
|
for (list = object_list; list; list = list->next) {
|
|
struct object *real_obj;
|
|
real_obj = deref_tag(list->item, NULL, 0);
|
|
if (strcmp(real_obj->type, commit_type))
|
|
seen_noncommit = 1;
|
|
}
|
|
if (cached)
|
|
die("both --cached and revisions given.");
|
|
|
|
for (list = object_list; list; list = list->next) {
|
|
struct object *real_obj;
|
|
real_obj = deref_tag(list->item, NULL, 0);
|
|
if (grep_object(&opt, paths, real_obj, list->name))
|
|
hit = 1;
|
|
}
|
|
return !hit;
|
|
}
|