Add IRC notificationn helper

bin/notifirc

@@ -0,0 +1,135 @@
+#!/bin/bash
+
+
+usage() {
+    echo "usage: $(basename "$0") [-h host] [-p port] [-n nick] [-c context] [-u user] message" >&2
+    exit 2
+}
+
+mkcommands() {
+    local user="$1"
+    local message="$2"
+    local nick="$3"
+    echo "NICK $nick"
+    echo "USER $nick 8 * :notifirc bot"
+    echo "PRIVMSG $user :$message"
+    echo "QUIT"
+}
+
+mknick() {
+    case "$context" in
+        "") echo "$nick" ;;
+        *)  echo "$nick|$context" ;;
+    esac
+}
+
+die() {
+    local msg="fatal: $1"
+    log "$msg"
+    log "-----END *-----"
+    echo "$msg" >&2
+    exit 3
+}
+
+warn() {
+    local msg="warning: $1"
+    echo "$msg" >&2
+    log "$msg"
+}
+
+log_pipe() {
+    local line
+    while IFS= read line;
+    do
+        log "$line"
+    done
+}
+
+log() {
+    echo "$1" >>"$logfile"
+}
+
+load_defaults() {
+    local rcfile=$1
+    test -e "$rcfile" || return 0
+    test -f "$rcfile" || {
+        warn "defaults file is not a file: $rcfile"
+        return 3
+    }
+    test -r "$rcfile" || {
+        warn "defaults file not readable: $rcfile"
+        return 3
+    }
+    bash -n "$rcfile" || {
+        warn "syntax error in defaults file: $rcfile"
+        return 3
+    }
+    . "$rcfile" || {
+        warn "error in defaults file: $rcfile"
+        return 3
+    }
+}
+
+choose_logfile() {
+    local path
+    {
+        echo /var/log/notifirc.log
+        echo "$HOME/.notifirc.log"
+        echo /tmp/notifirc.log
+    } \
+      | while read path;
+        do
+            if test -w "$(dirname "$path")" \
+             || test -w "$path";
+            then
+                echo "$path"
+                break
+            fi
+        done
+}
+
+main() {
+    local context nick host port user message logfile
+
+    logfile=$(choose_logfile)
+    test -n "$logfile" || {
+        echo "could not find writable logfile location" >&2
+        echo "logging will be off!" >&2
+        logfile=/dev/null
+    }
+
+    load_defaults /etc/notifirc.rc
+    load_defaults "$HOME/.notifirc.rc"
+
+    while true; do case $1 in
+        -c) context=$2; shift 2 || usage ;;
+        -h) host=$2;    shift 2 || usage ;;
+        -n) nick=$2;    shift 2 || usage ;;
+        -p) port=$2;    shift 2 || usage ;;
+        -u) user=$2;    shift 2 || usage ;;
+        --) shift; break ;;
+        -*) usage ;;
+        *)  break ;;
+    esac done
+    message="$*"
+
+    test -n "$host"    || usage
+    test -n "$port"    || usage
+    test -n "$user"    || usage
+    test -n "$nick"    || nick="notifirc"
+    test -n "$message" || usage
+
+    log "-----BEGIN sending notification-----"
+    log "host='$host'"
+    log "port='$port'"
+    log "nick='$nick'"
+    log "context='$context'"
+    log "user='$user'"
+    log "message='$message'"
+    mkcommands "$user" "$message" "$(mknick)" \
+      | nc "$host" "$port" 2>&1 \
+      | log_pipe
+    log "-----END sending notification-----"
+}
+
+main "$@"