#!/bin/sh
# Craig Jennings <c@cjennings.net>
# updates or clones repositories for backup

REPOS_HOME="/media/backup/repositories/"

# Create REPOS_HOME dir if not exists
if [ ! -d "$REPOS_HOME" ]; then
    mkdir -p "$REPOS_HOME"
fi

# Make sure REPOS_HOME dir is writable
if [ ! -w "$REPOS_HOME" ]; then
    echo "Directory $REPOS_HOME is not writable."
    exit 1
fi

# Make sure git is available
if ! command -v git >/dev/null 2>&1; then
    echo "Git command does not exist. Please install git."
    exit 1
fi

cd "$REPOS_HOME"

repos="
git@cjennings.net:archsetup.git
git@cjennings.net:dmenu.git
git@cjennings.net:dotemacs.git
git@cjennings.net:dotfiles.git
git@cjennings.net:dwm.git
git@cjennings.net:pinentry-dmenu.git
git@cjennings.net:rsyncshot.git
git@cjennings.net:st.git
git@github.com:cjennings/emacs-wttrin.git
https://github.com/d12frosted/elpa-mirror.git
https://github.com/mirrors/emacs.git
"

for repo in $repos; do
    dir=$(echo "$repo" | awk -F'[/:]' '{gsub(/.git/, "", $NF); print $NF}')
    # Note on the above awk command:
    # awk -F'[/:]':                        uses awk with a regex field delimiter that matches both : and /
    #                                      which will work with both ssh and http style URLs.
    # '{gsub(/.git/, "", $NF); print $NF}: This removes the ".git" postfixes from the last field ($NF)
    #                                      which leaves only the repo name.

    fullpath="$REPOS_HOME$dir"
    if [ -d "$fullpath" ]; then
        echo "Repository $dir exists at $fullpath, pulling..."
        (cd "$fullpath" && git pull)
    else
        echo "Repository $dir doesn't exist at $fullpath, cloning..."
        cd "$REPOS_HOME" && git clone --depth 1 "$repo" "$fullpath"
    fi
done