Add about page for repos with REAMDE

This commits adds a new dependency: md4c (https://github.com/mity/md4c).
Now stagit will generate an about page for each repo with a README,
converting it to HTML if it is a Markdown file.

1 files changed, 33 insertions, 4 deletions

diff --git a/stagit.c b/stagit.c
index e7965f1..93528b7 100644
--- a/stagit.c
+++ b/stagit.c
@@ -13,6 +13,7 @@
 #include <unistd.h>
 
 #include <git2.h>
+#include <md4c-html.h>
 
 #include "compat.h"
 
@@ -375,15 +376,14 @@ writeheader(FILE *fp, const char *title)
 		fputs("</a></td></tr>", fp);
 	}
 	fputs("<tr><td></td><td>\n", fp);
+	if (readme)
+		fprintf(fp, "<a href=\"%sabout.html\">About</a> | ", relpath);
 	fprintf(fp, "<a href=\"%slog.html\">Log</a> | ", relpath);
 	fprintf(fp, "<a href=\"%sfiles.html\">Files</a> | ", relpath);
 	fprintf(fp, "<a href=\"%srefs.html\">Refs</a>", relpath);
 	if (submodules)
 		fprintf(fp, " | <a href=\"%sfile/%s.html\">Submodules</a>",
 		        relpath, submodules);
-	if (readme)
-		fprintf(fp, " | <a href=\"%sfile/%s.html\">README</a>",
-		        relpath, readme);
 	if (license)
 		fprintf(fp, " | <a href=\"%sfile/%s.html\">LICENSE</a>",
 		        relpath, license);
@@ -1064,6 +1064,12 @@ usage(char *argv0)
 	exit(1);
 }
 
+void
+process_output_md(const char* text, unsigned int size, void* fp)
+{
+	fprintf((FILE *)fp, "%.*s", size, text);
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -1074,7 +1080,7 @@ main(int argc, char *argv[])
 	char path[PATH_MAX], repodirabs[PATH_MAX + 1], *p;
 	char tmppath[64] = "cache.XXXXXXXXXXXX", buf[BUFSIZ];
 	size_t n;
-	int i, fd;
+	int i, fd, r;
 
 	for (i = 1; i < argc; i++) {
 		if (argv[i][0] != '-') {
@@ -1190,6 +1196,7 @@ main(int argc, char *argv[])
 		if (!git_revparse_single(&obj, repo, readmefiles[i]) &&
 		    git_object_type(obj) == GIT_OBJ_BLOB)
 			readme = readmefiles[i] + strlen("HEAD:");
+			r = i;
 		git_object_free(obj);
 	}
 
@@ -1198,6 +1205,28 @@ main(int argc, char *argv[])
 		submodules = ".gitmodules";
 	git_object_free(obj);
 
+	/* about page */
+	if (readme) {
+		fp = efopen("about.html", "w");
+		writeheader(fp, "About");
+		git_revparse_single(&obj, repo, readmefiles[r]);
+		const char *s = git_blob_rawcontent((git_blob *)obj);
+		if (r == 1) {
+			git_off_t len = git_blob_rawsize((git_blob *)obj);
+			fputs("<div class=\"md\">", fp);
+			if (md_html(s, len, process_output_md, fp, MD_FLAG_TABLES | MD_FLAG_TASKLISTS |
+			    MD_FLAG_PERMISSIVEEMAILAUTOLINKS | MD_FLAG_PERMISSIVEURLAUTOLINKS, 0))
+				fprintf(stderr, "Error parsing markdown\n");
+			fputs("</div>\n", fp);
+		} else {
+			fputs("<pre id=\"about\">", fp);
+			xmlencode(fp, s, strlen(s));
+			fputs("</pre>\n", fp);
+		}
+		writefooter(fp);
+		fclose(fp);
+	}
+
 	/* log for HEAD */
 	fp = efopen("log.html", "w");
 	relpath = "";