INSTALL

#!/usr/bin/env bash
#
# FILE: INSTALL
#
# ABSTRACT: Install QC files from working copy and update crontab & .bashrc
#
# AUTHOR: Ralf Schandl
#

script_dir="$(cd "$(dirname "$0")" && pwd)"
script_name="$(basename "$0")"

cd "$script_dir" || exit 1

QC_DIR="$HOME/.qc"

execute()
{
    if [ -n "$NO_OP" ]; then
        echo "    $*"
    else
        "$@"
    fi
}

do_install()
{
    local fqfn="$1"
    local tgt="$2"

    if [ -e "$tgt" ]; then
        if [ "$mode" = "symlink" ] && [ -L "$tgt" ]; then
            tgtln="$(realpath "$tgt")"
            if [ "$fqfn" = "$tgtln" ]; then
                echo "Up-to-date: $tgt"
                return 0
            fi
        fi
        if [ -z "$FORCE" ]; then
                echo >&2 "ERROR: File exists: $tgt"
                echo >&2 "       Use '-f' to force overwrite."
                echo >&2 "       Or try '-h' to get help."
                echo >&2 ""
                exit 1
        fi
    fi

    if [ "$mode" = "copy" ]; then
        echo "Copying $fqfn -> $tgt"
        execute cp -f "$fqfn" "$tgt"
    else
        echo "Linking $tgt -> $fqfn"
        execute ln -fs "$fqfn" "$tgt"
    fi
}

install_rcfile()
{
    typeset fn="$1"
    typeset tgt_dir="$2"
    typeset bn="${fn#_}"
    # shellcheck disable=SC2155 # expect no error from realpath
    typeset fqfn="$(realpath "$fn")"
    typeset tgt="$tgt_dir/.$bn"

    do_install "$fqfn" "$tgt"

}

install_file()
{
    typeset fn="$1"
    typeset tgt_dir="$2"
    # shellcheck disable=SC2155 # expect no error from realpath
    typeset fqfn="$(realpath "$fn")"
    typeset tgt="$tgt_dir/$fn"

    do_install "$fqfn" "$tgt"
}

add_to_init_file()
{
    typeset file="$1"

    if [ ! -e "$file" ]; then
        echo "SKIPPED: File does not exist: $file"
        echo
        return
    fi

    if grep "quick_change_directory.sh" "$file" >/dev/null 2>&1; then
        echo "SKIPPED: The file quick_change_directory.sh seems to be already sourced from $file:"
        grep "quick_change_directory.sh" "$file" | sed "s/^/    /"
        echo "Please check that the path to the file is correct."
        echo
    else
        echo "Adding quick_change_directory.sh to $file..."

        typeset dir="${QC_DIR/#$HOME/\$HOME}"

        # to complex for execute function (because of redir)
        if [ -n "$NO_OP" ]; then
            if [ "$QC_DIR" != "$HOME/.qc" ]; then
                echo "    echo \"export QC_DIR=\\\"$dir\\\"\" >> $file"
            fi
            echo "    echo \"[ -f \\\"$dir/quick_change_directory.sh\\\" ] && . \\\"$dir/.qc/quick_change_directory.sh\\\"\" >> $file"
        else
            if [ "$QC_DIR" != "$HOME/.qc" ]; then
                echo "export QC_DIR=\"$dir\"" >> "$file"
            fi
            echo "[ -f \"$dir/quick_change_directory.sh\" ] && . \"$dir/quick_change_directory.sh\"" >> "$file"
        fi
    fi
}

usage()
{
    echo >&2 "Usage: $script_name [-nfCSh] [-t target-dir] <copy|symlink>"
    echo >&2 "   -n             Just print what would be done."
    echo >&2 "   -f             force overwrite existing files"
    echo >&2 "   -C             skip cron - don't configure cronjob"
    echo >&2 "   -S             skip shell config - don't change bashrc"
    echo >&2 "   -h             Show this help."
    echo >&2 "   -t target-dir  install to target-dir instead of ~/.qc"
}

#---------[ MAIN ]-------------------------------------------------------------

if [ $# -eq 0 ]; then
    usage
    exit 0
fi

NO_OP=
FORCE=
skip_cron=
skip_shell_cfg=
while getopts "nfCSht:" o "$@"; do
    case $o in
        n) NO_OP="false" ;;
        f) FORCE=true ;;
        C) skip_cron="true" ;;
        S) skip_shell_cfg="true" ;;
        t) QC_DIR="$OPTARG" ;;
        h) usage; exit 0 ;;
        *) usage; exit 1 ;;
    esac
done
shift $((OPTIND-1))

if [ $# -ne 1 ]; then
    echo >&2 "ERROR: exactly one argument needed ('copy' or 'symlink')"
    usage
    exit 1
fi

case "$1" in
    copy) mode="copy"
        ;;
    symlink) mode="symlink"
        ;;
    *) echo >&2 "Unknown mode: $1"
        usage
        exit 1
        ;;
esac

echo "Installing to $QC_DIR (mode $mode)"
if [ ! -d "$QC_DIR" ]; then
    execute mkdir -p "$QC_DIR"
fi

for fn in quick_change_directory.sh qc-backend qc-build-index dstore; do
    if [ ! -f "$fn" ]; then
        echo >&2 "ERROR: Missing file: $fn"
        exit 1
    fi
    install_file "$fn" "$QC_DIR"
done

if [ -e "$QC_DIR/qc-index.cfg" ]; then
    echo "Copying qc-index.cfg -> $QC_DIR/qc-index.cfg.new"
    execute cp -f qc-index.cfg "$QC_DIR/qc-index.cfg.new"
else
    echo "Copying qc-index.cfg -> $QC_DIR/qc-index.cfg"
    execute cp qc-index.cfg "$QC_DIR/qc-index.cfg"
fi

if [ -z "$skip_cron" ]; then
    echo "Configuring cronjob"
    execute "$QC_DIR"/qc-build-index --cron 10
    echo ""
fi

if [ -z "$skip_shell_cfg" ]; then
    add_to_init_file "$HOME/.bashrc"
    add_to_init_file "$HOME/.zshrc"
    add_to_init_file "$HOME/.kshrc"
fi

if [ -n "$NO_OP" ]; then
    echo
    echo "SIMULATION MODE - NOTHING DONE"
    echo
fi