Re: [9front] Patch to add -u flag to faces, so it only shows unread messages

[peter@pmikkelsen.com]

Quoth peter@pmikkelsen.com:
> I don't know if this is something people would want, but I post it here in case
> someone considers the feature good enough for committing.
> 

Here is an updated patch which uses sizeof(buf) and removes some unneeded braces.

 From 5595dbb332eae353832dbc2ad11ef92aeb8fcab0
From: Peter Mikkelsen <peter@pmikkelsen.com>
Date: Mon, 28 Jun 2021 21:45:53 +0000
Subject: [PATCH] Add -u flag to faces, making it only show unread messages.

---
diff 658757abed7be283e06bae3b1722fc2703334d74 5595dbb332eae353832dbc2ad11ef92aeb8fcab0
--- a/sys/man/1/faces	Sun Jun 27 02:13:58 2021
+++ b/sys/man/1/faces	Mon Jun 28 23:45:53 2021
@@ -4,7 +4,7 @@
 .SH SYNOPSIS
 .B faces
 [
-.B -ihc
+.B -ihcu
 ] [
 .B -m
 .I maildir
@@ -99,6 +99,15 @@
 rather than the current state of the mail box.
 In particular, faces are not removed from the screen when messages are deleted.
 Also, in this mode clicking button 1 in the display will clear the window.
+.PP
+The
+.B -u
+flag causes
+.I faces
+to read in the mailbox like with the
+.B -i
+flag, but it only shows the unread ones.
+When right-clicking on a message icon in this mode, the message is both plumbed and removed from the view.
 .PP
 .I Seemail
 is an
--- a/sys/src/cmd/faces/main.c	Sun Jun 27 02:13:58 2021
+++ b/sys/src/cmd/faces/main.c	Mon Jun 28 23:45:53 2021
@@ -10,6 +10,7 @@
 int	history = 0;	/* use old interface, showing history of mailbox rather than current state */
 int	initload = 0;	/* initialize program with contents of mail box */
 int	clickrm = 0;	/* allows removing mail faces by left clicking */
+int	onlyunread = 0;	/* initialize program with unread messages, remove when clicked */
 
 enum
 {
@@ -358,6 +359,28 @@
 	unlockdisplay(display);
 }
 
+int
+isunread(char *dir, char *num)
+{
+	char buf[1024], flags[8];
+	int n, fd, unread;
+
+	snprint(buf, sizeof(buf), "%s/%s/flags", dir, num);
+	fd = open(buf, OREAD);
+	if(fd < 0)
+		return 0;
+	n = readn(fd, flags, 7);
+	close(fd);
+	if(n != 7)
+		return 0;
+	flags[n] = '\0';
+	if(strchr(flags, 's') != nil)
+		unread = 0;
+	else
+		unread = 1;
+	return unread;
+}
+
 void
 loadmboxfaces(char *maildir)
 {
@@ -370,7 +393,8 @@
 		chdir(maildir);
 		while((n = dirread(dirfd, &d)) > 0){
 			for(i=0; i<n; i++)
-				addface(dirface(maildir, d[i].name));
+				if(onlyunread && isunread(maildir, d[i].name))
+					addface(dirface(maildir, d[i].name));
 			free(d);
 		}
 		close(dirfd);
@@ -616,6 +640,10 @@
 		for(i=first; i<last; i++)
 			if(ptinrect(p, facerect(i-first))){
 				showmail(faces[i]);
+				if(onlyunread){
+					delface(i);
+					flushimage(display, 1);
+				}
 				break;
 			}
 		unlockdisplay(display);
@@ -698,6 +726,10 @@
 		break;
 	case 'c':
 		clickrm++;
+		break;
+	case 'u':
+		initload++;
+		onlyunread++;
 		break;
 	default:
 		usage();