#!/bin/sh -e
# converts markdown to latex, then uses latex to make a PDF

REQUIRED=pdflatex

### common.sh

outfile=
while getopts o:h opt; do
    case $opt in
    o) outfile="$OPTARG" ;;
    h|?) usage "[-o output_file] [-h] [input_file]..."; exit 2 ;;
    esac
done

shift $(($OPTIND - 1))

### postopts.sh

### checkin.sh

if [ -z "$outfile" ]; then
    if [ -n "$1" ]; then
        outfile="${1%.*}"
    else
        outfile="stdin" # input is STDIN, since no argument given
    fi
fi
case "$outfile" in
*.*) ;; # skip appending extension if one is already present
*)   outfile="${outfile%.*}.pdf";;
esac

### tempdir.sh

# We should use a filename without white spaces for pdflatex.
TEXNAME=$THIS

to_utf8 "$@" | runpandoc -w latex -s >$THIS_TEMPDIR/$TEXNAME.tex
(
    cd $THIS_TEMPDIR
    if ! pdflatex -interaction=batchmode $TEXNAME.tex >/dev/null 2>&1; then
        err "LaTeX errors:"
        from_utf8 $TEXNAME.log | sed -ne '/^!/,/^ *$/p' >&2
        if grep -q "File \`ucs.sty' not found" $TEXNAME.log; then
            err "Please install the 'unicode' package from ctan.org."
        fi
        exit 1
    fi
)

is_target_exists=
if [ -f "$outfile" ]; then
    is_target_exists=1
    mv -f "$outfile" "$outfile~"
fi

mv -f $THIS_TEMPDIR/$TEXNAME.pdf "$outfile"

errn "Created '$outfile'"
[ -z "$is_target_exists" ] || {
    errn " (previous file has been backed up as '$outfile~')"
}
err .