From 3480effefa433e71db02129a1e30e454400a54ce Mon Sep 17 00:00:00 2001
From: markus schnalke <meillo@marmaro.de>
Date: Sat, 14 Apr 2012 20:37:31 +0200
Subject: [PATCH] mhshow: Can now be called as `next' or `prev' as well. This
 is a step in replacing show(1) by mhshow(1).

---
 uip/mhshow.c |   33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/uip/mhshow.c b/uip/mhshow.c
index c323867..fa7f256 100644
--- a/uip/mhshow.c
+++ b/uip/mhshow.c
@@ -53,6 +53,8 @@ extern char *parts[NPARTS + 1];
 extern char *types[NTYPES + 1];
 extern int userrs;
 
+static enum { SHOW, NEXT, PREV } mode = SHOW;
+
 int debugsw = 0;
 int verbosw = 0;
 
@@ -102,6 +104,11 @@ main(int argc, char **argv)
 	setlocale(LC_ALL, "");
 #endif
 	invo_name = mhbasename(argv[0]);
+	if (mh_strcasecmp(invo_name, "next")==0) {
+		mode = NEXT;
+	} else if (mh_strcasecmp(invo_name, "prev")==0) {
+		mode = PREV;
+	}
 
 	/* read user profile/context */
 	context_read();
@@ -122,7 +129,7 @@ main(int argc, char **argv)
 				adios(NULL, "-%s unknown", cp);
 
 			case HELPSW:
-				snprintf(buf, sizeof(buf), "%s [+folder] [msgs] [switches]", invo_name);
+				snprintf(buf, sizeof(buf), "%s [+folder] %s[switches]", invo_name, mode==SHOW ? "[msgs] " : "");
 				print_help(buf, switches, 1);
 				done(1);
 			case VERSIONSW:
@@ -148,6 +155,10 @@ main(int argc, char **argv)
 				continue;
 
 			case FILESW:
+				if (mode != SHOW) {
+					adios(NULL, "Either call mhshow as `%s' or use -file", invo_name);
+				}
+
 				if (!(cp = *argp++) || (*cp == '-' && cp[1]))
 					adios(NULL, "missing argument to %s",
 							argp[-2]);
@@ -179,8 +190,11 @@ main(int argc, char **argv)
 				adios(NULL, "only one folder at a time!");
 			else
 				folder = getcpy(expandfol(cp));
-		} else
+		} else if (mode != SHOW) {
+			adios(NULL, "Either call mhshow as `%s' or give message arguments", invo_name);
+		} else {
 			app_msgarg(&msgs, cp);
+		}
 	}
 
 	/* null terminate the list of acceptable parts/types */
@@ -241,8 +255,19 @@ main(int argc, char **argv)
 		/*
 		** message(s) are coming from a folder
 		*/
-		if (!msgs.size)
-			app_msgarg(&msgs, seq_cur);
+		if (!msgs.size) {
+			switch (mode) {
+			case NEXT:
+				app_msgarg(&msgs, seq_next);
+				break;
+			case PREV:
+				app_msgarg(&msgs, seq_prev);
+				break;
+			default:
+				app_msgarg(&msgs, seq_cur);
+				break;
+			}
+		}
 		if (!folder)
 			folder = getcurfol();
 		maildir = toabsdir(folder);
-- 
1.7.10.4