--filelist: Support reading from /dev/stdin ("-" as shortcut)

Note that read_filelist used to check if its argument was an image (for people
accidentaly typing "feh -df *" instead of "feh -dF *"); this was removed
because it failed on /dev/stdin.

I might re-add it, but I'm not yet sure about the future of feh's automatic
filelist saving.

1 files changed, 19 insertions, 2 deletions

diff --git a/man/feh.pre b/man/feh.pre
index 598231a..a1b7b9b 100644
--- a/man/feh.pre
+++ b/man/feh.pre
@@ -195,12 +195,20 @@ This option is similar to the playlists used by music software.  If
 .Ar file
 exists, it will be read for a list of files to load, in the order they appear.
 The format is a list of image filenames, absolute or relative to the current
-directory, one filename per line.  If
+directory, one filename per line.
+.
+.Pp
+.
+If
 .Ar file
 doesn't exist, it will be created from the internal filelist at the end of a
 viewing session.  This is best used to store the results of complex sorts
 .Pq Cm -Spixels No for example
-for later viewing.  Any changes to the internal filelist
+for later viewing.
+.
+.Pp
+.
+Any changes to the internal filelist
 .Pq such as deleting a file or it being pruned for being unloadable
 will be saved to
 .Ar file
@@ -209,6 +217,15 @@ when
 exits.  You can add files to filelists by specifying them on the commandline
 when also specifying the list.
 .
+.Pp
+.
+If
+.Ar file
+is
+.Qq - ,
+.Nm
+will read the filelist from its standard input.
+.
 .It Cm -e , --font Ar font
 .
 Set global font.  Should be a truetype font, resident in the current directory