mdocml: It's annoying that people keep writing URIs including redundant

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
It's annoying that people keep writing URIs including redundant parts
like "/OpenBSD-current/manN/".  To discourage that, let man.cgi(8)
redirect search form results to nice, concise URIs.

Modified Files:
--------------
    mdocml:
        cgi.c
        man.cgi.3

Revision Data
-------------
Index: cgi.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/cgi.c,v
retrieving revision 1.148
retrieving revision 1.149
diff -Lcgi.c -Lcgi.c -u -p -r1.148 -r1.149
--- cgi.c
+++ cgi.c
@@ -76,6 +76,7 @@ static	void		 pg_error_badrequest(const 
 static	void		 pg_error_internal(void);
 static	void		 pg_index(const struct req *);
 static	void		 pg_noresult(const struct req *, const char *);
+static	void		 pg_redirect(const struct req *, const char *);
 static	void		 pg_search(const struct req *);
 static	void		 pg_searchres(const struct req *,
 				struct manpage *, size_t);
@@ -540,6 +541,23 @@ pg_error_internal(void)
 }
 
 static void
+pg_redirect(const struct req *req, const char *name)
+{
+	printf("Status: 303 See Other\r\n");
+	printf("Location: http://%s/", HTTP_HOST);
+	if (*scriptname != '\0')
+		printf("%s/", scriptname);
+	if (strcmp(req->q.manpath, req->p[0]))
+		printf("%s/", req->q.manpath);
+	if (req->q.arch != NULL)
+		printf("%s/", req->q.arch);
+	printf("%s", name);
+	if (req->q.sec != NULL)
+		printf(".%s", req->q.sec);
+	printf("\r\nContent-Type: text/html; charset=utf-8\r\n\r\n");
+}
+
+static void
 pg_searchres(const struct req *req, struct manpage *r, size_t sz)
 {
 	char		*arch, *archend;
@@ -956,9 +974,13 @@ pg_search(const struct req *req)
 		}
 	}
 
-	if (0 == mansearch(&search, &paths, argc, argv, &res, &ressz))
+	res = NULL;
+	ressz = 0;
+	if (req->isquery && req->q.equal && argc == 1)
+		pg_redirect(req, argv[0]);
+	else if (mansearch(&search, &paths, argc, argv, &res, &ressz) == 0)
 		pg_noresult(req, "You entered an invalid query.");
-	else if (0 == ressz)
+	else if (ressz == 0)
 		pg_noresult(req, "No results found.");
 	else
 		pg_searchres(req, res, ressz);
Index: man.cgi.3
===================================================================
RCS file: /home/cvs/mdocml/mdocml/man.cgi.3,v
retrieving revision 1.2
retrieving revision 1.3
diff -Lman.cgi.3 -Lman.cgi.3 -u -p -r1.2 -r1.3
--- man.cgi.3
+++ man.cgi.3
@@ -126,12 +126,30 @@ contains a search query in short format 
 is empty and a
 .Ev QUERY_STRING
 is provided.
-It changes into the manpath and calls
+If possible, requests using
+.Ev QUERY_STRING
+are redirected to URIs using
+.Ev PATH_INFO
+by calling
+.Fn pg_redirect .
+Otherwise, it changes into the manpath and calls
 .Xr mansearch 3 .
 Depending on the result, it calls either
 .Fn pg_noresult
 or
 .Fn pg_searchres .
+.It Ft void Fn pg_redirect "const struct req *req" "const char *name"
+This function is special in so far as it does not print an HTML page,
+but only an HTTP 303 response with a Location: of the form:
+.Sm off
+.No http://
+.Ar host Ns /
+.Op Ar scriptname Ns /
+.Op Ar manpath Ns /
+.Op Ar arch Ns /
+.Fa name
+.Op Pf . Ar sec
+.Sm on
 .It Ft void Fn pg_noresult "const struct req *req" "const char *msg"
 This function calls
 .Fn resp_begin_html ,
--
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