added hosts file feature

contributed by @erpel

hostmux

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-USAGE="hostmux -h | [-xpPa] [-l <tmux layout>] [-s <session name>] host1 [host2 ...]"
+USAGE="hostmux -h | [-xpPa] [-l <tmux layout>] [-s <session name>] [-f <host_file>] host1 [host2 ...]"
 
 SESSION_NAME=hostmux
 LAYOUT=even-vertical
@@ -10,7 +10,7 @@ SET_PROMPT=false
 SYNC_PANES=false
 
 # Get optional user settings
-while getopts s:l:hxpPa opt; do
+while getopts s:l:f:hxpPa opt; do
     case $opt in
     s)     SESSION_NAME=$OPTARG
            ;;
@@ -19,11 +19,13 @@ while getopts s:l:hxpPa opt; do
     x)     CLOSE=" && exit"
            ;;
     p)     SET_PANE_TITLE=true
-           ;;   
+           ;;
     P)     SET_PROMPT=true
-           ;;   
+           ;;
     a)     SYNC_PANES=true
-           ;;   
+           ;;
+    f)     HOSTS_FILE=$OPTARG
+           ;;
     h)     echo $USAGE
            exit 0
            ;;
@@ -34,12 +36,34 @@ while getopts s:l:hxpPa opt; do
 esac done
 shift $((OPTIND - 1))
 
-NUMBER_OF_HOSTS=$#
+NUMBER_OF_HOSTS=0
+NUMBER_OF_HOST_ARGS=$#
+HOSTS=""
+
+while [ $NUMBER_OF_HOSTS -lt $NUMBER_OF_HOST_ARGS ]
+do
+    HOSTS="$HOSTS$1 "
+    NUMBER_OF_HOSTS=$(($NUMBER_OF_HOSTS+1))
+    shift
+done
+
+# Read hosts from the hosts file
+if [ -n "$HOSTS_FILE" ]
+then
+    while read line
+    do
+        HOSTS="$HOSTS$line "
+        NUMBER_OF_HOSTS=$(($NUMBER_OF_HOSTS+1))
+    done < hf
+fi
+
+echo $HOSTS
+echo $NUMBER_OF_HOSTS
 
 # Initialize Session
 tmux -2 new-session -d -s $SESSION_NAME
 
-# Split as many times as we have hosts as arguments and reset
+# Split as many times as we have hosts and reset
 # the layout each time for even distribution
 LOOP_INDEX=1
 
@@ -52,8 +76,6 @@ done
 # Check what pane-base-index is configured and use it for addressing
 # the panes
 PANE_INDEX=$(tmux show-window-options -g -v pane-base-index)
-PANE_MAX=$(($PANE_INDEX+$NUMBER_OF_HOSTS-1))
-
 
 # http://stackoverflow.com/questions/9747952/pane-title-in-tmux
 if $SET_PANE_TITLE; then
@@ -65,15 +87,15 @@ fi
 # then shift the argument list left, increase the index and go
 # into next iteration. Now $1 refers to the next argument passed
 # to the script
-while [ $PANE_INDEX -le $PANE_MAX ]; do
-    tmux send-keys -t $PANE_INDEX " ssh $1 $CLOSE" C-m
+for host in $HOSTS
+do
+    tmux send-keys -t $PANE_INDEX " ssh $host $CLOSE" C-m
     if $SET_PROMPT; then
-        tmux send-keys -t $PANE_INDEX " export PS1=\"[$1]$ \"" C-m
+        tmux send-keys -t $PANE_INDEX " export PS1=\"[$host]$ \"" C-m
     fi
     if $SET_PANE_TITLE; then
-        tmux send-keys -t $PANE_INDEX " unset PROMPT_COMMAND; printf '\033]2;$1\007'" C-m
+        tmux send-keys -t $PANE_INDEX " unset PROMPT_COMMAND; printf '\033]2;$host\007'" C-m
     fi
-    shift
     PANE_INDEX=$(($PANE_INDEX+1))
 done
 

hostmux.mandoc

@@ -10,6 +10,7 @@
 .Li |
 .Op Fl s Ar session-name
 .Op Fl l Ar tmux-layout
+.Op Fl f Ar host_file
 .Op Fl x
 .Op Fl p
 .Op Fl P
@@ -27,20 +28,23 @@ multiplex/broadcast commands to all split panes / servers (see -a).
 .Pp
 Its arguments are as follows:
 .Bl -tag -width Ds
-.It Fl s
+.It Fl s session-name
 Specify a name for the tmux session. It defaults to 'hostmux' which means that
 you can have only one hostmux session at a time if you don't specify unique
 names for your sessions
-.It Fl l
+.It Fl l tmux-layout
 Specify a valid tmux layout e.g. even-horizontal, tiled, etc. It defaults to
 'even-vertical'
+.It Fl f Ar hostfile
+Specify a file which contains a newline separated list of [user@]host names. The
+hosts from the file will be merged with the hosts provided as optional arguments
 .It Fl x
 Close the pane and/or session automatically when the ssh session
 exits successfully
 .It Fl p
 Identify panes by setting the pane title to the ssh hostname (tmux >= 2.3), may
 not work if the remote host does $PS1 magic like setting the terminal title,
-in that case use 
+in that case use
 .Fl P
 .It Fl P
 Identify panes by setting the remote prompt $PS1 to "[<hostname>]$ " after
@@ -67,4 +71,3 @@ to ssh. If you do need them, add them to your ~/.ssh/config
 was written by
 .An John-Paul Bader (hukl) ,
 .Mt [email protected] .
-

man/hostmux.1

@@ -11,6 +11,7 @@
 |
 [\fB\-s\fR\ \fIsession-name\fR]
 [\fB\-l\fR\ \fItmux-layout\fR]
+[\fB\-f\fR\ \fIhost_file\fR]
 [\fB\-x\fR]
 [\fB\-p\fR]
 [\fB\-P\fR]
@@ -28,14 +29,18 @@ multiplex/broadcast commands to all split panes / servers (see -a).
 .PP
 Its arguments are as follows:
 .TP 8n
-\fB\-s\fR
+\fB\-s\fR \fB\-session-name\fR
 Specify a name for the tmux session. It defaults to 'hostmux' which means that
 you can have only one hostmux session at a time if you don't specify unique
 names for your sessions
 .TP 8n
-\fB\-l\fR
+\fB\-l\fR \fB\-tmux-layout\fR
 Specify a valid tmux layout e.g. even-horizontal, tiled, etc. It defaults to
 .TP 8n
+\fB\-f\fR \fIhostfile\fR
+Specify a file which contains a newline separated list of [user@]host names. The
+hosts from the file will be merged with the hosts provided as optional arguments
+.TP 8n
 \fB\-x\fR
 Close the pane and/or session automatically when the ssh session
 exits successfully
@@ -75,4 +80,3 @@ The \fBhostmux\fR utility exits\~0 on success, and\~>0 if an error occurs.
 was written by
 John-Paul Bader (hukl),
 \fI[email protected]\fR.
-.sp