Teach -f <file> option to builtin-grep.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-grep.c b/builtin-grep.c
index c89ee33a1ede4e032cae850315ee2b2185a64457..a762c48a5a3de70c47814df830aae0760549d163 100644 (file)
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -82,6 +82,8 @@ static int pathspec_matches(const char **paths, const char *name)
 
 struct grep_pat {
        struct grep_pat *next;
+       const char *origin;
+       int no;
        const char *pattern;
        regex_t regexp;
 };
@@ -105,10 +107,13 @@ struct grep_opt {
        unsigned post_context;
 };
 
-static void add_pattern(struct grep_opt *opt, const char *pat)
+static void add_pattern(struct grep_opt *opt, const char *pat,
+                       const char *origin, int no)
 {
        struct grep_pat *p = xcalloc(1, sizeof(*p));
        p->pattern = pat;
+       p->origin = origin;
+       p->no = no;
        *opt->pattern_tail = p;
        opt->pattern_tail = &p->next;
        p->next = NULL;
@@ -121,9 +126,17 @@ static void compile_patterns(struct grep_opt *opt)
                int err = regcomp(&p->regexp, p->pattern, opt->regflags);
                if (err) {
                        char errbuf[1024];
+                       char where[1024];
+                       if (p->no)
+                               sprintf(where, "In '%s' at %d, ",
+                                       p->origin, p->no);
+                       else if (p->origin)
+                               sprintf(where, "%s, ", p->origin);
+                       else
+                               where[0] = 0;
                        regerror(err, &p->regexp, errbuf, 1024);
                        regfree(&p->regexp);
-                       die("'%s': %s", p->pattern, errbuf);
+                       die("%s'%s': %s", where, p->pattern, errbuf);
                }
        }
 }
@@ -482,7 +495,6 @@ int cmd_grep(int argc, const char **argv, char **envp)
 {
        int hit = 0;
        int no_more_flags = 0;
-       int seen_noncommit = 0;
        int cached = 0;
        struct grep_opt opt;
        struct object_list *list, **tail, *object_list = NULL;
@@ -598,9 +610,32 @@ int cmd_grep(int argc, const char **argv, char **envp)
                        }
                        continue;
                }
+               if (!strcmp("-f", arg)) {
+                       FILE *patterns;
+                       int lno = 0;
+                       char buf[1024];
+                       if (argc <= 1)
+                               usage(builtin_grep_usage);
+                       patterns = fopen(argv[1], "r");
+                       if (!patterns)
+                               die("'%s': %s", strerror(errno));
+                       while (fgets(buf, sizeof(buf), patterns)) {
+                               int len = strlen(buf);
+                               if (buf[len-1] == '\n')
+                                       buf[len-1] = 0;
+                               /* ignore empty line like grep does */
+                               if (!buf[0])
+                                       continue;
+                               add_pattern(&opt, strdup(buf), argv[1], ++lno);
+                       }
+                       fclose(patterns);
+                       argv++;
+                       argc--;
+                       continue;
+               }
                if (!strcmp("-e", arg)) {
                        if (1 < argc) {
-                               add_pattern(&opt, argv[1]);
+                               add_pattern(&opt, argv[1], "-e option", 0);
                                argv++;
                                argc--;
                                continue;
@@ -615,7 +650,7 @@ int cmd_grep(int argc, const char **argv, char **envp)
                if (!no_more_flags && *arg == '-')
                        usage(builtin_grep_usage);
                if (!opt.pattern_list) {
-                       add_pattern(&opt, arg);
+                       add_pattern(&opt, arg, "command line", 0);
                        break;
                }
                else {
@@ -656,21 +691,9 @@ int cmd_grep(int argc, const char **argv, char **envp)
 
        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.");
+               die("both --cached and trees are given.");
 
        for (list = object_list; list; list = list->next) {
                struct object *real_obj;