configure

#!/bin/sh

looking () {
    printf "looking $(echo $@)"
}

ok () {
    printf " OK\n"
}

missing () {
    printf " (missing)\n"
}

found () {
    printf " (${1:-found})"
    test -n "$2" && printf " $2"
    printf "\n"
}

have () {
    for f in "$@"
    do
        path=$(command -v "$1") || continue
        echo "$path"
        return 0
    done
    return 1
}

UNAME=$(uname)
HOST=$(hostname)
TIME=$(date)
echo "building for $UNAME on $HOST at $TIME"

looking "for /bin/sh"
SH=$(have /bin/sh) && {
    if sh --version 2>/dev/null | grep -q bash
    then
        found '' "oh ick, it looks like bash"
    else
        found
    fi
} || missing

looking "for dash"
DASH=$(have /bin/dash /usr/bin/dash dash) &&
found "$DASH" || missing

looking "for ln"
LN=$(have /bin/ln ln gln)
found "$LN" || missing

looking "for sed"
SED=$(have /usr/bin/sed sed gsed) &&
found "$SED" || missing

looking "for sort"
SORT=$(have /usr/bin/sort sort gsort)
found "$SORT" || missing

looking "for tr"
TR=$(have /usr/bin/tr tr gtr)
found "$TR" || missing

looking "for cut"
CUT=$(have /usr/bin/cut cut gcut)
found "$CUT" || missing

looking "for perl"
PERL=$(have perl)
found "$PERL" || missing

looking "for readlink"
READLINK=$(have readlink greadlink)
found "$READLINK" || missing

looking "for install"
INSTALL=$(have install ginstall)
found "$INSTALL" || missing

looking "for diff"
DIFF=$(have diff)
found "$DIFF" || missing

looking "for patch"
PATCH=$(have patch)
found "$PATCH" || missing

looking "for schocco"
SHOCCO=$(have shocco) &&
found "$SHOCCO" || missing

looking "for ronn"
RONN=$(have ronn) &&
found "$RONN" || missing

looking "for curl"
CURL=$(have curl)
found "$CURL" || missing

looking "for ruby"
RUBY=$(have ruby) &&
found "$RUBY" || missing

looking "for gem"
GEM=$(have gem) &&
found "$GEM" || missing

set -e

echo writing config.mk...
cat <<EOF > config.mk
SHELL    = $SH
DASH     = $DASH
LN       = $LN
INSTALL  = $INSTALL
SED      = $SED
SORT     = $SORT
TR       = $TR
CUT      = $CUT
PERL     = $PERL
READLINK = $READLINK
DIFF     = $DIFF
PATCH    = $PATCH
SHOCCO   = $SHOCCO
RONN     = $RONN
CURL     = $CURL
RUBY     = $RUBY
GEM      = $GEM
EOF

echo writing config.sh...
cat <<EOF > config.sh
SH='$SH'
DASH='$DASH'
LN='$LN'
SED='$SED'
SORT='$SORT'
TR='$TR'
CUT='$CUT'
PERL='$PERL'
READLINK='$READLINK'
DIFF='$DIFF'
PATCH='$PATCH'
CURL='$CURL'
RUBY='$RUBY'
GEM='$GEM'

alias ln="$LN"
alias sed="$SED"
alias sort="$SORT"
alias tr="$TR"
alias cut="$CUT"
alias perl="$PERL"
alias readlink="$READLINK"
alias diff="$DIFF"
alias patch="$PATCH"
alias curl="$CURL"
alias ruby="$RUBY"
alias gem="$GEM"
EOF

echo "done. run \`make' to build and \`make install' to install."