#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2018 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     foamCreateManpage
#
# Description
#     Query OpenFOAM applications with -help-man to generate manpage content.
#
#------------------------------------------------------------------------------
defaultOutputDir="$WM_PROJECT_DIR/doc/man1"

usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

Usage: ${0##*/} [OPTION] [appName .. [appNameN]]
options:
  -dir dir          Directory to process
  -gzip             Compressed output
  -o DIR            Write to alternative output directory
  -version VER      Specify an alternative version
  -h | -help        Print the usage

Query OpenFOAM applications with -help-man for their manpage content
and redirect to corresponding directory location.
Default input:  \$FOAM_APPBIN only.
Default output: $defaultOutputDir

Uses the search directory if applications are specified.

Copyright (C) 2018 OpenCFD Ltd.
USAGE
    exit 1
}

# Report error and exit
die()
{
    exec 1>&2
    echo
    echo "Error encountered:"
    while [ "$#" -ge 1 ]; do echo "    $1"; shift; done
    echo
    echo "See '${0##*/} -help' for usage"
    echo
    exit 1
}

#-------------------------------------------------------------------------------
searchDirs="$FOAM_APPBIN"
unset gzipFilter sedFilter outputDir

while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help*)
        usage
        ;;
    -d | -dir)
        [ "$#" -ge 2 ] || die "'$1' option requires an argument"
        searchDirs="$2"
        [ -d "$searchDirs" ] || die "directory not found '$searchDirs'"
        shift
        ;;
    -gz | -gzip)
        gzipFilter="gzip"
        ;;
    -v | -version)
        [ "$#" -ge 2 ] || die "'$1' option requires an argument"
        version="$2"
        sedFilter='s/OpenFOAM-[^\"]*/OpenFOAM-'"$version/"
        shift
        ;;
    -o | -output)
        [ "$#" -ge 2 ] || die "'$1' option requires an argument"
        outputDir="$2"
        shift
        ;;
    -*)
        die "unknown option: '$1'"
        ;;
    *)
        break
        ;;
    esac
    shift
done

: ${outputDir:=$defaultOutputDir}

# Verify that output is writeable
if [ -e "$outputDir" ]
then
    [ -d "$outputDir" ] && [ -w "$outputDir" ] || \
        die "Cannot write to $outputDir" "Not a directory, or no permission?"
else
    mkdir -p "$outputDir" || \
        die "Cannot create directory: $outputDir"
fi

#-------------------------------------------------------------------------------

# Pass through content, filter for version and/or gzip
#

tmpFile="$outputDir/${0##*/}"
trap "rm -fv $tmpFile >/dev/null; exit 0" EXIT TERM INT

process()
{
    local appName="$1"
    local outFile="$outputDir/${appName##*/}.1"

    rm -f "$outFile"*;

    "$appName" -help-man 2>/dev/null >| $tmpFile;

    if grep -F -q "SYNOPSIS" "$tmpFile" 2>/dev/null
    then
        cat "$tmpFile" | \
            sed -e "${sedFilter}" | "${gzipFilter:-cat}" \
            >| "$outFile${gzipFilter:+.gz}"

        echo "$outFile${gzipFilter:+.gz}" 1>&2
    else
        echo "Problem with $appName" 1>&2
    fi
}

#------------------------------------------------------------------------------

# Default to standard search directories
[ "$#" -gt 0 ] || set -- ${searchDirs}

echo "Generating manpages from OpenFOAM applications" 1>&2
echo 1>&2

for item
do
    if [ -d "$item" ]
    then
        # Process directory for applications - sort with ignore-case
        echo "[directory] $item" 1>&2
        choices="$(find $item -maxdepth 1 -executable -type f | sort -f 2>/dev/null)"
        for appName in $choices
        do
            process $appName
        done
    elif command -v "$item" > /dev/null 2>&1
    then
        process $item
    else
        echo "No such file or directory: $item" 1>&2
    fi
done

echo 1>&2
echo "Done" 1>&2


# -----------------------------------------------------------------------------