git-rev-list: factor out the commit printing from "main()"
[git/git.git] / rev-list.c
1 #include "cache.h"
2 #include "commit.h"
3
4 #define SEEN (1u << 0)
5 #define INTERESTING (1u << 1)
6 #define UNINTERESTING (1u << 2)
7
8 static const char rev_list_usage[] =
9 "usage: git-rev-list [OPTION] commit-id <commit-id>\n"
10 " --max-count=nr\n"
11 " --max-age=epoch\n"
12 " --min-age=epoch\n"
13 " --header\n"
14 " --pretty";
15
16 static int verbose_header = 0;
17 static int show_parents = 0;
18 static int pretty_print = 0;
19 static int hdr_termination = 0;
20 static const char *prefix = "";
21 static unsigned long max_age = -1;
22 static unsigned long min_age = -1;
23 static int max_count = -1;
24
25 static void show_commit(struct commit *commit)
26 {
27 printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
28 if (show_parents) {
29 struct commit_list *parents = commit->parents;
30 while (parents) {
31 printf(" %s", sha1_to_hex(parents->item->object.sha1));
32 parents = parents->next;
33 }
34 }
35 putchar('\n');
36 if (verbose_header) {
37 const char *buf = commit->buffer;
38 if (pretty_print) {
39 static char pretty_header[16384];
40 pretty_print_commit(commit->buffer, ~0, pretty_header, sizeof(pretty_header));
41 buf = pretty_header;
42 }
43 printf("%s%c", buf, hdr_termination);
44 }
45 }
46
47 static void show_commit_list(struct commit_list *list)
48 {
49 while (list) {
50 struct commit *commit = pop_most_recent_commit(&list, SEEN);
51
52 if (commit->object.flags & UNINTERESTING)
53 continue;
54 if (min_age != -1 && (commit->date > min_age))
55 continue;
56 if (max_age != -1 && (commit->date < max_age))
57 break;
58 if (max_count != -1 && !max_count--)
59 break;
60 show_commit(commit);
61 }
62 }
63
64 static void mark_parents_uninteresting(struct commit *commit)
65 {
66 struct commit_list *parents = commit->parents;
67
68 while (parents) {
69 struct commit *commit = parents->item;
70 commit->object.flags |= UNINTERESTING;
71 parents = parents->next;
72 }
73 }
74
75 static int everybody_uninteresting(struct commit_list *list)
76 {
77 while (list) {
78 struct commit *commit = list->item;
79 list = list->next;
80 if (commit->object.flags & UNINTERESTING)
81 continue;
82 return 0;
83 }
84 return 1;
85 }
86
87 int main(int argc, char **argv)
88 {
89 int nr_sha;
90 unsigned char sha1[2][20];
91 struct commit_list *list = NULL;
92 struct commit *commit, *end;
93 int i;
94
95 nr_sha = 0;
96 for (i = 1 ; i < argc; i++) {
97 char *arg = argv[i];
98
99 if (!strncmp(arg, "--max-count=", 12)) {
100 max_count = atoi(arg + 12);
101 continue;
102 }
103 if (!strncmp(arg, "--max-age=", 10)) {
104 max_age = atoi(arg + 10);
105 continue;
106 }
107 if (!strncmp(arg, "--min-age=", 10)) {
108 min_age = atoi(arg + 10);
109 continue;
110 }
111 if (!strcmp(arg, "--header")) {
112 verbose_header = 1;
113 continue;
114 }
115 if (!strcmp(arg, "--pretty")) {
116 verbose_header = 1;
117 pretty_print = 1;
118 hdr_termination = '\n';
119 prefix = "commit ";
120 continue;
121 }
122 if (!strcmp(arg, "--parents")) {
123 show_parents = 1;
124 continue;
125 }
126
127 if (nr_sha > 2 || get_sha1(arg, sha1[nr_sha]))
128 usage(rev_list_usage);
129 nr_sha++;
130 }
131
132 if (!nr_sha)
133 usage(rev_list_usage);
134
135 commit = lookup_commit_reference(sha1[0]);
136 if (!commit || parse_commit(commit) < 0)
137 die("bad starting commit object");
138
139 end = NULL;
140 if (nr_sha > 1) {
141 end = lookup_commit_reference(sha1[1]);
142 if (!end || parse_commit(end) < 0)
143 die("bad ending commit object");
144 }
145
146 commit_list_insert(commit, &list);
147 if (end) {
148 struct commit_list *newlist = NULL;
149 struct commit_list **p = &newlist;
150 do {
151 struct commit *commit = pop_most_recent_commit(&list, SEEN);
152 struct object *obj = &commit->object;
153
154 if (commit == end || (obj->flags & UNINTERESTING)) {
155 mark_parents_uninteresting(commit);
156 if (everybody_uninteresting(list))
157 break;
158 continue;
159 }
160 p = &commit_list_insert(commit, p)->next;
161 } while (list);
162 list = newlist;
163 }
164
165 show_commit_list(list);
166 return 0;
167 }