#!/bin/bash
# Send an e-mail to the maintainer of a package someone else has committed to.
# Exit on any error
set -e
set -o pipefail

# Maximum number of packages changed in a single commit and still notify people
readonly MAXCHANGES=10

# Location of the maintdb database
readonly MAINTDB=/var/www/bs/data/maintdb.txt

# Repository base directory
readonly REPOS="$1"

# Revision of the change
readonly REV="$2"

# Author of the commit
readonly AUTHOR="$(svnlook author -r "$REV" "$REPOS")"

if [[ "$AUTHOR" == "schedbot" || "$AUTHOR" == "umeabot" ]]; then
    # We don't send any e-mails from these automated committers
    exit 0
fi

PKGSLIST="$(mktemp)"
trap 'rm -f "$PKGSLIST"' EXIT

# Only look at changes in package files
svnlook changed -r "$REV" "$REPOS" | \
sed 's/^....//' | \
pcregrep -o1 -o2 '^(?:(?:cauldron|misc)/([-+._a-zA-Z0-9]+)/)|(?:(?:updates|backports)/(?:[^/ ]+)/([-+._a-zA-Z0-9]+))' | \
sort -u > "$PKGSLIST"
if [[ "$(wc -l "$PKGSLIST" | awk '{print $1}')" -gt "$MAXCHANGES" ]]; then
    # A bunch of directories were changed at once, possibly in some kind of
    # bulk operation. Ignore these entirely to avoid spamming people.
    echo Too many packages were changed. Not notifying the maintainers. 1>&2
    exit 0
fi

# Send up to one e-mail per package modified in the commit
for PACKAGE in $(cat "$PKGSLIST"); do
    MAINTAINER="$(awk '{if ($1 == "'"$PACKAGE"'") {print $2; exit;}}' "$MAINTDB")"
    # Only notify if the commit author is not the maintainer
    if [[ -n "$MAINTAINER" && "$MAINTAINER" != "nobody" && "$MAINTAINER" != "$AUTHOR" ]]; then

        svnnotify                                   \
            --repos-path    "$REPOS"                \
            --revision      "$REV"                  \
            --subject-cx                            \
            --no-first-line                         \
            --handler       Alternative             \
            --alternative   HTML::ColorDiff         \
            --header        "The user $AUTHOR has submitted a change to a package for which you ($MAINTAINER) are the registered maintainer." \
            --revision-url  "https://svnweb.<%= @domain %>/packages/?revision=%s&view=revision" \
            --author-url    "https://people.<%= @domain %>/u/%s.html" \
            --to            "$MAINTAINER@<%= @domain %>"   \
            --from          "subversion_noreply@ml.<%= @domain %>"

    fi
done