1 files changed, 68 insertions, 0 deletions
diff --git a/krebs/5pkgs/irc-announce/default.nix b/krebs/5pkgs/irc-announce/default.nix
new file mode 100644
index 000000000..af6b35ec6
--- /dev/null
+++ b/krebs/5pkgs/irc-announce/default.nix
@@ -0,0 +1,68 @@
+{ pkgs, lib, ... }:
+
+with lib;
+
+pkgs.writeDashBin "irc-announce" ''
+  set -euf
+
+  export PATH=${makeSearchPath "bin" (with pkgs; [
+    coreutils
+    gawk
+    gnused
+    netcat
+    nettools
+  ])}
+
+  IRC_SERVER=$1
+  IRC_PORT=$2
+  IRC_NICK=$3$$
+  IRC_CHANNEL=$4
+  message=$5
+
+  export IRC_CHANNEL # for privmsg_cat
+
+  # echo2 and cat2 are used output to both, stdout and stderr
+  # This is used to see what we send to the irc server. (debug output)
+  echo2() { echo "$*"; echo "$*" >&2; }
+  cat2() { tee /dev/stderr; }
+
+  # privmsg_cat transforms stdin to a privmsg
+  privmsg_cat() { awk '{ print "PRIVMSG "ENVIRON["IRC_CHANNEL"]" :"$0 }'; }
+
+  # we cd to /tmp here to be able to create a tmpdir in the first place
+  cd /tmp
+  # ircin is used to feed the output of netcat back to the "irc client"
+  # so we can implement expect-like behavior with sed^_^
+  # XXX mkselfdestructingtmpfifo would be nice instead of this cruft
+  tmpdir="$(mktemp -d irc-announce_XXXXXXXX)"
+  cd "$tmpdir"
+  mkfifo ircin
+  trap "
+    rm ircin
+    cd '$OLDPWD'
+    rmdir '$tmpdir'
+    trap - EXIT INT QUIT
+  " EXIT INT QUIT
+
+  {
+    echo2 "USER $LOGNAME 0 * :$LOGNAME@$(hostname)"
+    echo2 "NICK $IRC_NICK"
+
+    # wait for MODE message
+    sed -n '/^:[^ ]* MODE /q'
+
+    echo2 "JOIN $IRC_CHANNEL"
+
+    printf '%s' "$message" \
+      | privmsg_cat \
+      | cat2
+
+    echo2 "PART $IRC_CHANNEL"
+
+    # wait for PART confirmation
+    sed -n '/:'"$IRC_NICK"'![^ ]* PART /q'
+
+    echo2 'QUIT :Gone to have lunch'
+  } < ircin \
+    | nc "$IRC_SERVER" "$IRC_PORT" | tee -a ircin
+''