Add support for reading from file

Hard-coded limits are 3 lines and 80 chars per line.  Empty lines are
ignored (not counted to the limit).

File can be '-' for standard input

bin/notifirc

@@ -2,17 +2,23 @@
 
 
 usage() {
-    echo "usage: $(basename "$0") [-h host] [-p port] [-n nick] [-c context] [-u user] message" >&2
+    local self=$(basename "$0")
+    echo "usage: $self [options] message" >&2
+    echo "usage: $self [options] -f message_file|-" >&2
+    echo "options: [-h host] [-p port] [-n nick] [-c context] [-u user]" >&2
     exit 2
 }
 
 mkcommands() {
     local user="$1"
-    local message="$2"
-    local nick="$3"
+    local nick="$2"
+    local message
     echo "NICK $nick"
     echo "USER $nick 8 * :notifirc bot"
-    echo "PRIVMSG $user :$message"
+    while read message;
+    do
+        echo "PRIVMSG $user :$message"
+    done
     echo "QUIT"
 }
 
@@ -70,6 +76,25 @@ load_defaults() {
     }
 }
 
+read_file() {
+    local fpath=$1
+    local limit_l=3
+    local limit_c=80
+    local lines_read=0
+    local suff=""
+    grep . "$fpath" \
+      | while true;
+        do
+            test $lines_read -ge $limit_l && break
+            IFS= read line || break
+            (( lines_read++ ))
+            test ${#line} -gt $limit_c && suff=…
+            line=${line:0:$limit_c}$suff
+            log "read from $fpath: $line"
+            echo "$line"
+        done
+}
+
 choose_logfile() {
     local path
     {
@@ -89,7 +114,7 @@ choose_logfile() {
 }
 
 main() {
-    local context nick host port user message logfile
+    local context nick host port user message logfile msgfile
 
     logfile=$(choose_logfile)
     test -n "$logfile" || {
@@ -103,6 +128,7 @@ main() {
 
     while true; do case $1 in
         -c) context=$2; shift 2 || usage ;;
+        -f) msgfile=$2; shift 2 || usage ;;
         -h) host=$2;    shift 2 || usage ;;
         -n) nick=$2;    shift 2 || usage ;;
         -p) port=$2;    shift 2 || usage ;;
@@ -117,7 +143,7 @@ main() {
     test -n "$port"    || usage
     test -n "$user"    || usage
     test -n "$nick"    || nick="notifirc"
-    test -n "$message" || usage
+    test -z "$message$msgfile" && usage
 
     log "-----BEGIN sending notification-----"
     log "host='$host'"
@@ -125,8 +151,13 @@ main() {
     log "nick='$nick'"
     log "context='$context'"
     log "user='$user'"
+    log "msgfile='$msgfile'"
     log "message='$message'"
-    mkcommands "$user" "$message" "$(mknick)" \
+    {
+        test -n "$message" && printf '%s\n' "$message"
+        test -n "$msgfile" && read_file "$msgfile"
+    } \
+      | mkcommands "$user" "$(mknick)" \
       | nc "$host" "$port" 2>&1 \
       | log_pipe
     log "-----END sending notification-----"