heirloom-vi

#!/bin/sh -xe
# Run (maybe make (maybe download)) the "Traditional Vi" — http://ex-vi.sourceforge.net/
# TODO: Deduplicate this against heirloom-sh (this one is more generalized)
HEIRLOOM_BASE_DIR=${HEIRLOOM_BASE_DIR:-~/pkg}
repo_name=ex-vi
product=vi
heirloom_dir="$HEIRLOOM_BASE_DIR/$repo_name"
cvs_root=:pserver:anonymous@ex-vi.cvs.sourceforge.net:/cvsroot/$repo_name

run() {
    [ -x $heirloom_dir/$product ] && exec $heirloom_dir/$product "$@" || true
}
retry() {
    exec $0 "$@"
}
build() {
    echo "Found $heirloom_dir, but no '$product' executable. Building."
    cd $heirloom_dir
    make && echo Ok\!; echo
}
download() {
    type cvs || (echo 'Requires `cvs` to download. =('; exit 1)
    [ -d $HEIRLOOM_BASE_DIR ] || \
        mkdir $HEIRLOOM_BASE_DIR || \
            (echo 'Weird. Couldn''t `mkdir $HEIRLOOM_BASE_DIR`'; exit 1)
    cd $HEIRLOOM_BASE_DIR
    cvs -d$cvs_root co -P $repo_name
    cd $_
    type ctags && ctags -R . &
}

if [ -e $heirloom_dir ]; then
    run "$@"
    build
    retry "$@"
else
    download
    build
    retry "$@"
fi