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#!/bin/sh
# Copyright (C) 2008 Tim Post - All Rights Reserved
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# Neither the name of the original program's authors nor the names of its
# contributors may be used to endorse or promote products derived from this
# software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

# Script to generate skeletal files for a new command
# Uses `getopt', not quite a bash-ism but might be
# lacking on some legacy systems.

# If your shell does not support eval, shift (x) or
# here-now documents, sorry :) 

usage()
{
    def="$DEFAULT_COMMAND"
    cat << EOF
\`$PROGNAME' generates skeletal command files to simplify adding commands
Usage: $PROGNAME [options] <location>
Options:
  -n, --name         Name of the command (default: ${def})
  -d, --desc         Short (20 30 chars) description of the command
                     (def: "The $def command")
  -e, --entry        Entry function of the command (def: cmd_${def})
  -h, --help-entry   Entry function for command help (def: help_cmd_${def})
  -a, --alias        Alias (nickname) for this command (def: none)
  -r, --restrict     Restriction level (interactive, non-interactive, both)
                     (def: module is both, builtin is interactive only)
  -t, --type         Type of command (module or builtin) (def: module)
  -H, --help         This help summary
  -V, --version      Print $PROGNAME version and exit normally

Notes:
  You must supply at least the name of the command.

  If you do not specify a location (i.e. modules/foo), the command will be
  created in modules/command_name or builtins/command_name depending on your
  selection.

  This script will only create skeletal files and inform you what headers
  need to be modified to incorporate the command. You will also have to
  manually update the main Makefile.

  This script is intended only to be a convenience for developers. Example use:
    $PROGNAME -n foo -d "Foo power" -a bar -r both -t module modules/foo

  The example would generate a modular command named 'foo', which is also
  reached by typing 'bar' and available in either interactive or noninteractive
  mode.

  Skeletal files do *not* depend on the autoconf generated "config.h" unless you
  include it. This may or may not be desirable depending on your use.

Report bugs to $PROGMAINT

EOF
}

# Convert a string to all uppercase
toupper()
{
    local str="$1"

    echo "${str}" | tr 'a-z' 'A-Z'
}

# Template stored `here-now' style, this generates all files needed
# for a new command according to arguments passed.
generate_code()
{
    echo "Creating ${OUTDIR}/${CMDNAME}_def.h ..."
    cat << EOF > ${OUTDIR}/${CMDNAME}_def.h
{
    "${CMDNAME}",
    "${CMDDESC}",
    &${CMDENTRY},
    &${HELPENTRY},
    ${CMDRESTRICT}
},

EOF
    [ -n "${CMDALIAS}" ] && cat << EOF >> ${OUTDIR}/${CMDNAME}_def.h
{
    "${CMDALIAS}",
    NULL,
    &${CMDENTRY},
    &${HELPENTRY},
    ${CMDRESTRICT}
},

EOF
    local defname=$(toupper "${CMDNAME}")
    echo "Creating ${OUTDIR}/entry.h ..."
    cat << EOF > ${OUTDIR}/entry.h
#ifndef ${defname}_ENTRY_H
#define ${defname}_ENTRY_H

EOF
    [ "${CMDTYPE}" = "module" ] && cat << EOF >> ${OUTDIR}/entry.h
/* Entry points for the ${CMDNAME} command */
extern int ${CMDENTRY}(char **);
extern void ${HELPENTRY}(unsigned int);

#endif /* ${defname}_ENTRY_H */

EOF
    [ "${CMDTYPE}" = "builtin" ] && cat << EOF >> ${OUTDIR}/entry.h
/* Pick up cliuser_t */
#include "scli.h"

/* Entry points for the ${CMDNAME} command */
extern int * ${CMDENTRY}(char **, cliuser_t *);
extern void * ${HELPENTRY}(unsigned int);

#endif /* ${defname}_ENTRY_H */

EOF
    echo "Creating ${OUTDIR}/${CMDNAME}.h ..."
    cat << EOF > ${OUTDIR}/${CMDNAME}.h
#ifndef ${defname}_H
#define ${defname}_H

/* Prototypes for the ${CMDNAME} command, excluding entry points */


#endif /* ${defname}_H */

EOF
    echo "Creating ${OUTDIR}/${CMDNAME}.c ..."
    cat << EOF > ${OUTDIR}/${CMDNAME}.c
/* Automatically generated by ${PROGNAME} on ${TIMESTAMP}
 * This is machine generated output. The author of ${PROGNAME} claims no
 * copyright over the contents of this file. Where legally permitted, the
 * contents herein are donated to the public domain.
 *
 * You should apply any license and copyright that you wish to this file,
 * replacing this header in its entirety. */

#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "util.h"
#include "errors.h"
#include "entry.h"
#include "${CMDNAME}.h"
#include "cmds.h"

static char *cmdname = "${CMDNAME}";

/* Dispays help for ${CMDNAME} in various levels */
void ${HELPENTRY}(unsigned int level)
{
    printf("This is the %s help for '%s'.\n",
        level ? EXT_HELP : SHORT_HELP, cmdname);
    return;
}

EOF
    [ "${CMDTYPE}" = "module" ] && cat << EOF >> ${OUTDIR}/${CMDNAME}.c
/* Main entry point for ${CMDNAME}, accepts an array of arguments */
int ${CMDENTRY}(char **argv)
EOF
    [ "${CMDTYPE}" = "builtin" ] && cat << EOF >> ${OUTDIR}/${CMDNAME}.c
/* Main entry point for ${CMDNAME}, accepts an array of arguments and a
 * pointer to the cliuser_t structure */
int ${CMDENTRY}(char **argv, cliuser_t *usr)
EOF
    cat << EOF >> ${OUTDIR}/${CMDNAME}.c
{
    unsigned int argc;
    unsigned int i;

    /* Count the arguments */
    for (argc = 0; argv[argc] != NULL; argc ++);

    printf("%s %s\n", TEST_ANNOUNCE, cmdname);
    printf("%d arguments passed to %s", argc - 1, cmdname);

    if (argc < 2) {
        printf("\n");
        return CMD_SUCCESS;
    }

    printf(":\n");
    for (i = 1; i < argc; i++)
        printf("[%d] -> %s\n", i, argv[i]);

    return CMD_SUCCESS;
}

EOF
    printf "Done.\n\nYou should now modify %ss/%ss.h and ../Makefile" \
        "${CMDTYPE}" "${CMDTYPE}"
    printf " to include your new command.\n"
    [ -n "$CMDALIAS" ] &&  {
        printf "\nYou should also modify %ss/%s_aliases.h and " \
            "${CMDTYPE}" "${CMDTYPE}"
        printf "add %s as an alias for %s\n" \
            "${CMDALIAS}" "${CMDNAME}"
    }
    printf "\nOnce completed, re-run make\n\n"
}

# Main program

TIMESTAMP="$(date)"
PROGNAME=$(basename $0)
PROGVER="0.0.1"
PROGMAINT="Tim Post <echo@echoreply.us>"
DEFAULT_COMMAND="cmdname"

# We need at least one
[ $# = 0 ] && usage && exit 1;

TEMP=$(getopt -o n:d:e:h:a:r:t:HV \
--long name:,desc:,entry:,help-entry:,alias:,restrict:,type:,help,version \
-- "$@") || {
    echo "Try $PROGNAME --help for help"
}

eval set -- "$TEMP"

while true; do
    case "$1" in
    -n | --name)
        CMDNAME="$2"
        shift 2
        continue
    ;;
    -d | --desc)
        CMDDESC="$2"
        shift 2
        continue
    ;;
    -e | --entry)
        CMDENTRY="$2"
        shift 2
        continue
    ;;
    -h | --help-entry)
        HELPENTRY="$2"
        shift 2
        continue
    ;;
    -a | --alias)
        CMDALIAS="$2"
        shift 2
        continue
    ;;
    -r | --restrict)
        CMDRESTRICT="$2"
        shift 2
        continue
    ;;
    -t | --type)
        CMDTYPE="$2"
        shift 2
        continue
    ;;
    -H | --help)
        usage
        exit 0
    ;;
    -V | --version)
        echo "$PROGVER"
        exit 0
    ;;
    --)
        break
    ;;
    esac
done

# Pick up a location if one was specified
eval set -- "$*"
[ -n "$2" ] && OUTDIR="$2"

# Fill in defaults for whatever was not specified
[ -n "$CMDNAME" ] || CMDNAME="$DEFAULT_COMMAND"
[ -n "$CMDDESC" ] || CMDDESC="The $CMDNAME command"
[ -n "$CMDENTRY" ] || CMDENTRY="cmd_${CMDNAME}"
[ -n "$HELPENTRY" ] || HELPENTRY="help_cmd_${CMDNAME}"
[ -n "$CMDTYPE" ] || CMDTYPE="module"
[ -n "$OUTDIR" ] || OUTDIR="${CMDTYPE}s/${CMDNAME}"

# Builtins typically only need to be available in interactive mode,
# set the default accordingly.
[ -n "$CMDRESTRICT" ] || {
    [ "$CMDTYPE" = "module" ] && CMDRESTRICT="both"
    [ "$CMDTYPE" = "builtin" ] && CMDRESTRICT="interactive"
}

# Set the restriction level as the structure expects to see it
case "$CMDRESTRICT" in
    0 | both)
        CMDRESTRICT="0"
    ;;
    1 | non-interactive)
        CMDRESTRICT="1"
    ;;
    -1 | interactive)
        CMDRESTRICT="-1"
    ;;
    *)
        usage
        exit 1
    ;;
esac

# Do a little sanity
[ -d $OUTDIR ] && {
    echo "$OUTDIR already exists, remove it to proceed."
    exit 1
}

mkdir -p ${OUTDIR} >/dev/null 2>&1 || {
    echo "Could not create ${OUTDIR}, aborting!"
    exit 1
}

# Generate the files and inform on how to include them based on options
generate_code

exit 0