1 files changed, 107 insertions, 0 deletions
diff --git a/krebs/5pkgs/simple/git-hooks/default.nix b/krebs/5pkgs/simple/git-hooks/default.nix
new file mode 100644
index 000000000..4017b873b
--- /dev/null
+++ b/krebs/5pkgs/simple/git-hooks/default.nix
@@ -0,0 +1,107 @@
+{ pkgs, ... }:
+
+with import <stockholm/lib>;
+
+{
+  # TODO irc-announce should return a derivation
+  #      but it cannot because krebs.git.repos.*.hooks :: attrsOf str
+  irc-announce = { nick, channel, server, port ? 6667, verbose ? false, branches ? [] }: ''
+    #! /bin/sh
+    set -euf
+
+    export PATH=${makeBinPath (with pkgs; [
+      coreutils
+      git
+      gnugrep
+      gnused
+    ])}
+
+    green()  { printf '\x0303,99%s\x0F' "$1"; }
+    red()    { printf '\x0304,99%s\x0F' "$1"; }
+    orange() { printf '\x0307,99%s\x0F' "$1"; }
+    pink()   { printf '\x0313,99%s\x0F' "$1"; }
+    gray()   { printf '\x0314,99%s\x0F' "$1"; }
+
+    unset message
+    add_message() {
+      message="''${message+$message
+    }$*"
+    }
+
+    nick=${escapeShellArg nick}
+    channel=${escapeShellArg channel}
+    server=${escapeShellArg server}
+    port=${toString port}
+
+    host=$nick
+    cgit_endpoint=http://cgit.$host.r
+
+    empty=0000000000000000000000000000000000000000
+
+    while read oldrev newrev ref; do
+
+      if [ $oldrev = $empty ]; then
+        receive_mode=create
+      elif [ $newrev = $empty ]; then
+        receive_mode=delete
+      elif [ "$(git merge-base $oldrev $newrev)" = $oldrev ]; then
+        receive_mode=fast-forward
+      else
+        receive_mode=non-fast-forward
+      fi
+
+      h=$(echo $ref | sed 's:^refs/heads/::')
+
+      ${optionalString (branches != []) ''
+        if ! (echo "$h" | grep -qE "${concatStringsSep "|" branches}"); then
+          echo "we are not serving this branch: $h"
+          exit 0
+        fi
+      ''}
+      # empty_tree=$(git hash-object -t tree /dev/null)
+      empty_tree=4b825dc6
+
+      id=$(echo $newrev | cut -b-7)
+      id2=$(echo $oldrev | cut -b-7)
+      if [ $newrev = $empty ]; then id=$empty_tree; fi
+      if [ $oldrev = $empty ]; then id2=$empty_tree; fi
+
+      case $receive_mode in
+        create)
+          link="$cgit_endpoint/$GIT_SSH_REPO/?h=$h"
+          ;;
+        delete)
+          link="$cgit_endpoint/$GIT_SSH_REPO/ ($h)"
+          ;;
+        fast-forward|non-fast-forward)
+          link="$cgit_endpoint/$GIT_SSH_REPO/diff/?h=$h&id=$id&id2=$id2"
+          ;;
+      esac
+
+      #$host $GIT_SSH_REPO $ref $link
+      add_message $(pink push) $link $(gray "($receive_mode)")
+
+      ${optionalString verbose ''
+        add_message "$(
+          git log \
+              --format="$(orange %h) %s $(gray '(%ar)')" \
+              --reverse \
+              $id2..$id
+
+          git diff --stat $id2..$id \
+            | sed '$!s/\(+*\)\(-*\)$/'$(green '\1')$(red '\2')'/'
+        )"
+      ''}
+
+    done
+
+    if test -n "''${message-}"; then
+      exec ${pkgs.irc-announce}/bin/irc-announce \
+        "$server" \
+        "$port" \
+        "$nick" \
+        "$channel" \
+        "$message"
+    fi
+  '';
+}