compiler

#!/bin/sh
# Compile or execute a file based on extension or shebang.

set -eu

[ "$#" -eq 1 ] || {
    printf 'Usage: %s <file>\n' "$0" >&2
    exit 1
}

file=$(readlink -f "$1")
[ -f "$file" ] || {
    printf 'File not found: %s\n' "$1" >&2
    exit 1
}

dir=$(dirname "$file")
base="${file%.*}"

cd "$dir"

textype() {
    command_name='pdflatex'
    if sed -n '1,5p' "$file" | grep -iq 'xelatex'; then
        command_name='xelatex'
    fi

    "$command_name" --output-directory="$dir" "$file"

    if grep -iq 'addbibresource' "$file"; then
        biber --input-directory "$dir" "$base"
        "$command_name" --output-directory="$dir" "$file"
    fi

    "$command_name" --output-directory="$dir" "$file"
}

case "$file" in
    *.ms) refer -PS -e "$file" | groff -me -ms -kejpt -T pdf > "$base".pdf ;;
    *.mom) refer -PS -e "$file" | groff -mom -kejpt -T pdf > "$base".pdf ;;
    *.tex) textype ;;
    *.md) pandoc "$file" --pdf-engine=xelatex -o "$base".pdf ;;
    *.c) gcc "$file" -o "$base" && "$base" ;;
    *.py) python3 "$file" ;;
    *)
        if sed -n '1s/^#!//p' "$file" | grep -q .; then
            "$file"
        else
            printf 'No build rule for file: %s\n' "$file" >&2
            exit 1
        fi
        ;;
esac