git-grep: show pathnames relative to the current directory

[thirdparty/git.git] / builtin-grep.c

diff --git a/builtin-grep.c b/builtin-grep.c
index 93b7e07b30ced0b4f4bad544d9bd8dbedadf452c..a561612e7efd31f92a8becd8f94516877146ad7f 100644 (file)
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -123,6 +123,7 @@ struct grep_opt {
        struct grep_pat *pattern_list;
        struct grep_pat **pattern_tail;
        struct grep_expr *pattern_expression;
+       int prefix_length;
        regex_t regexp;
        unsigned linenum:1;
        unsigned invert:1;
@@ -136,6 +137,7 @@ struct grep_opt {
 #define GREP_BINARY_TEXT       2
        unsigned binary:2;
        unsigned extended:1;
+       unsigned relative:1;
        int regflags;
        unsigned pre_context;
        unsigned post_context;
@@ -632,19 +634,40 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
        return !!last_hit;
 }
 
-static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name)
+static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
 {
        unsigned long size;
        char *data;
        char type[20];
+       char *to_free = NULL;
        int hit;
+
        data = read_sha1_file(sha1, type, &size);
        if (!data) {
                error("'%s': unable to read %s", name, sha1_to_hex(sha1));
                return 0;
        }
+       if (opt->relative && opt->prefix_length) {
+               static char name_buf[PATH_MAX];
+               char *cp;
+               int name_len = strlen(name) - opt->prefix_length + 1;
+
+               if (!tree_name_len)
+                       name += opt->prefix_length;
+               else {
+                       if (ARRAY_SIZE(name_buf) <= name_len)
+                               cp = to_free = xmalloc(name_len);
+                       else
+                               cp = name_buf;
+                       memcpy(cp, name, tree_name_len);
+                       strcpy(cp + tree_name_len,
+                              name + tree_name_len + opt->prefix_length);
+                       name = cp;
+               }
+       }
        hit = grep_buffer(opt, name, data, size);
        free(data);
+       free(to_free);
        return hit;
 }
 
@@ -674,6 +697,8 @@ static int grep_file(struct grep_opt *opt, const char *filename)
                return 0;
        }
        close(i);
+       if (opt->relative && opt->prefix_length)
+               filename += opt->prefix_length;
        i = grep_buffer(opt, filename, data, st.st_size);
        free(data);
        return i;
@@ -720,7 +745,7 @@ static int external_grep(struct grep_opt *opt, const char **paths, int cached)
        char *argptr = randarg;
        struct grep_pat *p;
 
-       if (opt->extended)
+       if (opt->extended || (opt->relative && opt->prefix_length))
                return -1;
        len = nr = 0;
        push_arg("grep");
@@ -845,7 +870,7 @@ static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
                if (!pathspec_matches(paths, ce->name))
                        continue;
                if (cached)
-                       hit |= grep_sha1(opt, ce->sha1, ce->name);
+                       hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
                else
                        hit |= grep_file(opt, ce->name);
        }
@@ -860,11 +885,12 @@ static int grep_tree(struct grep_opt *opt, const char **paths,
        int hit = 0;
        struct name_entry entry;
        char *down;
-       char *path_buf = xmalloc(PATH_MAX + strlen(tree_name) + 100);
+       int tn_len = strlen(tree_name);
+       char *path_buf = xmalloc(PATH_MAX + tn_len + 100);
 
-       if (tree_name[0]) {
-               int offset = sprintf(path_buf, "%s:", tree_name);
-               down = path_buf + offset;
+       if (tn_len) {
+               tn_len = sprintf(path_buf, "%s:", tree_name);
+               down = path_buf + tn_len;
                strcat(down, base);
        }
        else {
@@ -886,7 +912,7 @@ static int grep_tree(struct grep_opt *opt, const char **paths,
                if (!pathspec_matches(paths, down))
                        ;
                else if (S_ISREG(entry.mode))
-                       hit |= grep_sha1(opt, entry.sha1, path_buf);
+                       hit |= grep_sha1(opt, entry.sha1, path_buf, tn_len);
                else if (S_ISDIR(entry.mode)) {
                        char type[20];
                        struct tree_desc sub;
@@ -907,7 +933,7 @@ static int grep_object(struct grep_opt *opt, const char **paths,
                       struct object *obj, const char *name)
 {
        if (obj->type == OBJ_BLOB)
-               return grep_sha1(opt, obj->sha1, name);
+               return grep_sha1(opt, obj->sha1, name, 0);
        if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
                struct tree_desc tree;
                void *data;
@@ -945,6 +971,8 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
        int i;
 
        memset(&opt, 0, sizeof(opt));
+       opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
+       opt.relative = 1;
        opt.pattern_tail = &opt.pattern_list;
        opt.regflags = REG_NEWLINE;
 
@@ -1118,6 +1146,10 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
                        }
                        die(emsg_missing_argument, arg);
                }
+               if (!strcmp("--full-name", arg)) {
+                       opt.relative = 0;
+                       continue;
+               }
                if (!strcmp("--", arg)) {
                        /* later processing wants to have this at argv[1] */
                        argv--;
@@ -1176,8 +1208,15 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
                        verify_filename(prefix, argv[j]);
        }
 
-       if (i < argc)
+       if (i < argc) {
                paths = get_pathspec(prefix, argv + i);
+               if (opt.prefix_length && opt.relative) {
+                       /* Make sure we do not get outside of paths */
+                       for (i = 0; paths[i]; i++)
+                               if (strncmp(prefix, paths[i], opt.prefix_length))
+                                       die("git-grep: cannot generate relative filenames containing '..'");
+               }
+       }
        else if (prefix) {
                paths = xcalloc(2, sizeof(const char *));
                paths[0] = prefix;