Merge with http://members.cox.net/junkio/git-jc.git

[git.git] / diff-tree.c

diff --git a/diff-tree.c b/diff-tree.c
index 9e15b70..51e3274 100644 (file)
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -2,11 +2,15 @@
 #include "cache.h"
 #include "diff.h"
 
+static int silent = 0;
+static int verbose_header = 0;
 static int ignore_merges = 1;
 static int recursive = 0;
 static int read_stdin = 0;
 static int line_termination = '\n';
 static int generate_patch = 0;
+static const char *header = NULL;
+static const char *header_prefix = "";
 
 // What paths are we interested in?
 static int nr_paths = 0;
@@ -67,6 +71,14 @@ static void show_file(const char *prefix, void *tree, unsigned long size, const
        const char *path;
        const unsigned char *sha1 = extract(tree, size, &path, &mode);
 
+       if (header) {
+               printf("%s", header);
+               header = NULL;
+       }
+
+       if (silent)
+               return;
+
        if (recursive && S_ISDIR(mode)) {
                char type[20];
                unsigned long size;
@@ -138,6 +150,13 @@ static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, uns
                return retval;
        }
 
+       if (header) {
+               printf("%s", header);
+               header = NULL;
+       }
+       if (silent)
+               return 0;
+
        if (generate_patch) {
                if (!S_ISDIR(mode1))
                        diff_change(mode1, mode2, sha1, sha2, base, path1);
@@ -253,11 +272,82 @@ static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, co
        return retval;
 }
 
+static int get_one_line(const char *msg, unsigned long len)
+{
+       int ret = 0;
+
+       while (len--) {
+               ret++;
+               if (*msg++ == '\n')
+                       break;
+       }
+       return ret;
+}
+
+static int add_author_info(char *buf, const char *line, int len)
+{
+       char *date;
+       unsigned int namelen;
+       unsigned long time;
+       int tz;
+
+       line += strlen("author ");
+       date = strchr(line, '>');
+       if (!date)
+               return 0;
+       namelen = ++date - line;
+       time = strtoul(date, &date, 10);
+       tz = strtol(date, NULL, 10);
+
+       return sprintf(buf, "Author: %.*s\nDate:   %s\n",
+               namelen, line,
+               show_date(time, tz));
+}
+
+static char *generate_header(const char *commit, const char *parent, const char *msg, unsigned long len)
+{
+       static char this_header[1000];
+       int offset;
+
+       offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
+       if (verbose_header) {
+               int hdr = 1;
+
+               for (;;) {
+                       const char *line = msg;
+                       int linelen = get_one_line(msg, len);
+
+                       if (!linelen)
+                               break;
+                       if (offset + linelen + 10 > sizeof(this_header))
+                               break;
+
+                       msg += linelen;
+                       len -= linelen;
+                       if (linelen == 1)
+                               hdr = 0;
+                       if (hdr) {
+                               if (!memcmp(line, "author ", 7))
+                                       offset += add_author_info(this_header + offset, line, linelen);
+                               continue;
+                       }
+                       memset(this_header + offset, ' ', 4);
+                       memcpy(this_header + offset + 4, line, linelen);
+                       offset += linelen + 4;
+               }
+               this_header[offset++] = '\n';
+               this_header[offset] = 0;
+       }
+
+       return this_header;
+}
+
 static int diff_tree_stdin(char *line)
 {
        int len = strlen(line);
        unsigned char commit[20], parent[20];
        unsigned long size, offset;
+       static char this_header[1000];
        char *buf;
 
        if (!len || line[len-1] != '\n')
@@ -266,9 +356,10 @@ static int diff_tree_stdin(char *line)
        if (get_sha1_hex(line, commit))
                return -1;
        if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
-               line[40] = ' ';
+               line[40] = 0;
                line[81] = 0;
-               printf("%s:\n", line);
+               sprintf(this_header, "%s (from %s)\n", line, line+41);
+               header = this_header;
                return diff_tree_sha1(parent, commit, "");
        }
        buf = read_object_with_reference(commit, "commit", &size, NULL);
@@ -286,14 +377,17 @@ static int diff_tree_stdin(char *line)
        while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
                if (get_sha1_hex(buf + offset + 7, parent))
                        return -1;
-               printf("%s %s:\n", line, sha1_to_hex(parent));
+               header = generate_header(line, sha1_to_hex(parent), buf, size);
                diff_tree_sha1(parent, commit, "");
+               if (!header && verbose_header)
+                       header_prefix = "\ndiff-tree ";
                offset += 48;
        }
        return -1;
 }
 
-static char *diff_tree_usage = "diff-tree [-p] [-r] [-z] <tree sha1> <tree sha1>";
+static char *diff_tree_usage =
+"diff-tree [-p] [-r] [-z] [--stdin] [-m] [-s] [-v] <tree sha1> <tree sha1>";
 
 int main(int argc, char **argv)
 {
@@ -330,6 +424,15 @@ int main(int argc, char **argv)
                        ignore_merges = 0;
                        continue;
                }
+               if (!strcmp(arg, "-s")) {
+                       silent = 1;
+                       continue;
+               }
+               if (!strcmp(arg, "-v")) {
+                       verbose_header = 1;
+                       header_prefix = "diff-tree ";
+                       continue;
+               }
                if (!strcmp(arg, "--stdin")) {
                        read_stdin = 1;
                        continue;