stagit: add -l option: limit the amount of commits for the log.html file

[stagit.git] / stagit.c

diff --git a/stagit.c b/stagit.c
index 1bc57e228b1a25a16c4326dd71b220eed7f9c36d..81fdd1d15faef622e0b25d94225136c3b4de33dd 100644 (file)
--- a/stagit.c
+++ b/stagit.c
@@ -57,6 +57,7 @@ static char *strippedname = "";
 static char description[255];
 static char cloneurl[1024];
 static int haslicense, hasreadme, hassubmodules;
+static long long nlogcommits = -1; /* < 0 indicates not used */
 
 /* cache */
 static git_oid lastoid;
@@ -558,7 +559,7 @@ writelog(FILE *fp, const git_oid *oid)
        struct commitinfo *ci;
        git_revwalk *w = NULL;
        git_oid id;
-       char path[PATH_MAX];
+       char path[PATH_MAX], oidstr[GIT_OID_HEXSZ + 1];
        FILE *fpfile;
        int r;
 
@@ -572,24 +573,37 @@ writelog(FILE *fp, const git_oid *oid)
 
                if (cachefile && !memcmp(&id, &lastoid, sizeof(id)))
                        break;
+
+               git_oid_tostr(oidstr, sizeof(oidstr), &id);
+               r = snprintf(path, sizeof(path), "commit/%s.html", oidstr);
+               if (r == -1 || (size_t)r >= sizeof(path))
+                       errx(1, "path truncated: 'commit/%s.html'", oidstr);
+               r = access(path, F_OK);
+
+               /* optimization: if there are no log lines to write and
+                  the commit file already exists: skip the diffstat */
+               if (!nlogcommits && !r)
+                       continue;
+
                if (!(ci = commitinfo_getbyoid(&id)))
                        break;
-               /* lookup stats: only required here */
+               /* diffstat: for stagit HTML required for the log.html line */
                if (commitinfo_getstats(ci) == -1)
                        goto err;
 
-               writelogline(fp, ci);
+               if (nlogcommits < 0) {
+                       writelogline(fp, ci);
+               } else if (nlogcommits > 0) {
+                       writelogline(fp, ci);
+                       nlogcommits--;
+               }
+
                if (cachefile)
                        writelogline(wcachefp, ci);
 
-               relpath = "../";
-
-               r = snprintf(path, sizeof(path), "commit/%s.html", ci->oid);
-               if (r == -1 || (size_t)r >= sizeof(path))
-                       errx(1, "path truncated: 'commit/%s.html'", ci->oid);
-
                /* check if file exists if so skip it */
-               if (access(path, F_OK)) {
+               if (r) {
+                       relpath = "../";
                        fpfile = efopen(path, "w");
                        writeheader(fpfile, ci->summary);
                        fputs("<pre>", fpfile);
@@ -986,7 +1000,7 @@ err:
 void
 usage(char *argv0)
 {
-       fprintf(stderr, "%s [-c cachefile] repodir\n", argv0);
+       fprintf(stderr, "%s [-c cachefile] [-l commits] repodir\n", argv0);
        exit(1);
 }
 
@@ -1012,9 +1026,20 @@ main(int argc, char *argv[])
                                usage(argv[0]);
                        repodir = argv[i];
                } else if (argv[i][1] == 'c') {
-                       if (i + 1 >= argc)
+                       if (nlogcommits > 0 || i + 1 >= argc)
                                usage(argv[0]);
                        cachefile = argv[++i];
+               } else if (argv[i][1] == 'l') {
+                       if (cachefile || i + 1 >= argc)
+                               usage(argv[0]);
+                       errno = 0;
+                       nlogcommits = strtoll(argv[++i], &p, 10);
+                       if (argv[i][0] == '\0' || *p != '\0' ||
+                           nlogcommits <= 0)
+                               usage(argv[0]);
+                       if (errno == ERANGE && (nlogcommits == LLONG_MAX ||
+                           nlogcommits == LLONG_MIN))
+                               usage(argv[0]);
                }
        }
        if (!cachefile && pledge("stdio rpath wpath cpath", NULL) == -1)