From 01132292c8a35f820712c6e9aebdb21d30248d84 Mon Sep 17 00:00:00 2001
From: Meudwy <meudwy@meudwy.uk>
Date: Tue, 25 Jul 2023 11:55:26 +0100
Subject: [PATCH] minc: read directory names from stdin

This matches `mlist` where it can take directories as arguments or via
stdin.
---
 GNUmakefile   |  4 ++--
 man/minc.1    |  3 +++
 minc.c        | 13 ++++++++-----
 t/9000-minc.t |  6 ++++++
 4 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/GNUmakefile b/GNUmakefile
index c90e9383..89cb7794 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -28,8 +28,8 @@ all: $(ALL) museragent
 $(ALL) : % : %.o
 maddr magrep mdeliver mexport mflag mflow mgenmid mhdr mpick mscan msed mshow \
   msort mthread : blaze822.o mymemmem.o mytimegm.o
-maddr magrep mdeliver mexport mflag mgenmid mhdr mlist mpick mscan msed mseq \
-  mshow msort mthread : seq.o slurp.o mystrverscmp.o
+maddr magrep mdeliver mexport mflag mgenmid mhdr minc mlist mpick mscan msed \
+  mseq mshow msort mthread : seq.o slurp.o mystrverscmp.o
 maddr magrep mflow mhdr mpick mscan mshow : rfc2047.o
 magrep mflow mhdr mshow : rfc2045.o
 mshow : filter.o safe_u8putstr.o rfc2231.o pipeto.o
diff --git a/man/minc.1 b/man/minc.1
index cb71c859..6b7f96c5 100644
--- a/man/minc.1
+++ b/man/minc.1
@@ -17,6 +17,9 @@ by moving them from
 to
 .Pa cur ,
 and adjusting the filenames.
+If used non-interactively with no specified folders,
+.Nm
+reads directory names from the standard input.
 .Pp
 By default, the new filenames are printed,
 separated by newlines.
diff --git a/minc.c b/minc.c
index c1d28fd2..2811646a 100644
--- a/minc.c
+++ b/minc.c
@@ -74,14 +74,17 @@ main(int argc, char *argv[])
 			exit(1);
 		}
 
-	if (optind == argc)
-		goto usage;
-
 	xpledge("stdio rpath cpath", "");
 
 	status = 0;
-	for (i = optind; i < argc; i++)
-		inc(argv[i]);
+	if (optind == argc) {
+		if (isatty(0))
+			goto usage;
+		blaze822_loop(0, 0, inc);
+	} else {
+		for (i = optind; i < argc; i++)
+			inc(argv[i]);
+	}
 
 	return status;
 }
diff --git a/t/9000-minc.t b/t/9000-minc.t
index 3d5b7894..3f6de27e 100644
--- a/t/9000-minc.t
+++ b/t/9000-minc.t
@@ -16,4 +16,10 @@ inbox/new/2
 
 check_test 'minc' -eq 2 'minc inbox | wc -l'
 
+while read f; do touch "$f"; done <<!
+inbox/new/3:2,
+inbox/new/4
+!
+
+check_test 'minc stdin' -eq 2 'echo inbox | minc | wc -l'
 )