seq: - now refers to the message on stdin, use .- for previous message

NEWS.md

@@ -1,3 +1,12 @@
+## 1.0
+
+* Caution! Backwards incompatible changes:
+  * As a message name, `-` now refers to the message on the standard input,
+    and not the the previous message anymore.  Use `.-` to refer to
+    the previous message in a short way.
+    The tools will print a warning if you use `-` and the standard input
+    comes from a TTY.
+
 ## 0.7 (2020-05-15)
 
 * All tools now follow symlinks to mails.
@@ -28,7 +37,7 @@
 
 * New tool msearch to wrap several mail indexers.
 * New zsh completion _mblaze.
-* mnext/mprev were removed (you can call `mless +`/`mless -`).
+* mnext/mprev were removed (you can call `mless +`/`mless .-`).
 * The GnuPG tools in contrib/ now use gpg2.
 * mshow exits with error if it could not extract all attachments
 * mrep: add -noquote to disable quoting the message replied to

blaze822.c

@@ -592,7 +592,11 @@ blaze822_file(char *file)
 	char *buf = 0;
 	ssize_t rd = 0, n;
 
-	int fd = open(file, O_RDONLY);
+	int fd;
+	if (strcmp(file, "/dev/stdin") == 0)
+		fd = dup(0);
+	else
+		fd = open(file, O_RDONLY);
 	if (fd < 0)
 		return 0;
 

man/mmsg.7

@@ -1,4 +1,4 @@
-.Dd July 22, 2016
+.Dd July 3, 2020
 .Dt MMSG 7
 .Os
 .Sh NAME
@@ -77,7 +77,9 @@ with more indentation
 .Pc .
 .Pp
 The following special shortcuts may be used:
-.Bl -tag -width 3n
+.Bl -tag -width 4n
+.It Sq Li \&-
+refers to the message read directly from the standard input.
 .It Sq Li \&.
 refers to the current message.
 Additionally, the syntax
@@ -91,7 +93,7 @@ refers to the next message
 like
 .Sq Li \&.+1
 .Pc
-.It Sq Li \&-
+.It Sq Li \&.-
 refers to the previous message
 .Po
 like

seq.c

@@ -151,6 +151,9 @@ blaze822_seq_cur(void)
 int
 blaze822_seq_setcur(char *s)
 {
+	if (strcmp(s, "/dev/stdin") == 0)
+		return 0;
+
 	char *override = getenv("MAILDOT");
 	if (override)
 		return 0;
@@ -180,7 +183,7 @@ parse_relnum(char *a, long cur, long start, long last, long *out)
 
 	if (strcmp(a, "+") == 0)
 		a = ".+1";
-	else if (strcmp(a, "-") == 0)
+	else if (strcmp(a, ".-") == 0)
 		a = ".-1";
 	else if (strcmp(a, ".") == 0)
 		a = ".+0";
@@ -538,6 +541,14 @@ blaze822_loop(int argc, char *argv[], void (*cb)(char *))
 	for (i = 0; i < argc; i++) {
 		if (strchr(argv[i], '/')) {  // a file name
 			j += iterdir(argv[i], cb);
+		} else if (strcmp(argv[i], "-") == 0) {
+			if (isatty(0)) {
+				fprintf(stderr, "mblaze: warning: - now means "
+				    "read mail text from standard input, "
+				    "use .- to refer to previous mail\n");
+			}
+			cb("/dev/stdin");
+			j++;
 		} else {
 			if (!map_opened) {
 				map = blaze822_seq_open(0);

t/7000-mseq.t

@@ -25,7 +25,7 @@ export MAILCUR=cur MAILSEQ=seq
 
 check 'set current' 'mseq -C 1 && mseq . | grep "inbox/cur/1:2,"'
 check 'set next' 'mseq -C + && mseq . | grep "inbox/cur/2:2,"'
-check 'set prev' 'mseq -C - && mseq . | grep "inbox/cur/1:2,"'
+check 'set prev' 'mseq -C .- && mseq . | grep "inbox/cur/1:2,"'
 check 'last' 'mseq "$" | grep "inbox/cur/10:2,"'
 check_test 'whole thread' -eq 4 'mseq 6= | wc -l'
 check_test  'subthread' -eq 2 'mseq 7_ | wc -l'