#!/usr/bin/perl -w

# fileman
# Scott Bronson
# 8 Dec 2003

# This file shows how to use Term::ShellUI to create a simple
# command-line environment.  It is similar to fileman.c, the
# example that comes with the GNU Readline library.

# This file is released under the MIT license.

use strict;
use lib '../lib';
use Term::ShellUI;
use File::stat qw(:FIELDS);
use Cwd;


# Prevents us from doing anything harmful.
# Have it return 1 to live on the edge.
sub danger
{
    print "Not performing task -- too dangerous!\n";
    return 0;
}


my $term = new Term::ShellUI(commands => get_commands());
$term->prompt(sub { getcwd() . " FM> " });
$term->run();

sub get_commands
{
    return {
        "cd" =>     { desc => "Change to directory DIR",
                      args => sub { shift->complete_onlydirs(@_); },
                      maxargs => 1,
                      proc => sub { chdir($_[0] || $ENV{HOME} || $ENV{LOGDIR}) or print("Could not cd: $!\n") } },
        "delete" => { desc => "Delete FILEs",
                      args => sub { shift->complete_onlyfiles(@_); },
                      minargs => 1,
                      proc => sub { danger() && (unlink(@_) or warn "Could not delete: $!\n") } },
        "?" =>      { syn => "help" },
        "help" =>   { desc => "Print helpful information",
                      args => sub { shift->help_args(undef, @_); },
                      meth => sub { shift->help_call(undef, @_); } },
        "ls" =>     { syn => "list" },
        "dir" =>    { syn => "ls" },
        "list" =>   { desc => "List files in DIRs",
                      args => sub { shift->complete_onlydirs(@_); },
                      proc => sub { system('ls', '-FClg', @_); } },
        "pwd" =>    { desc => "Print the current working directory",
                      maxargs => 0,
                      proc => sub { system('pwd'); } },
        "quit" =>   { desc => "Quit using Fileman",
                      maxargs => 0,
                      meth => sub { shift->exit_requested(1); } },
        "rename" => { desc => "Rename FILE to NEWNAME",
                      args => sub { shift->complete_files(@_); },
                      minargs => 2, maxargs => 2,
                      proc => sub { danger() && system('mv', @_); } },
        "stat" =>   { desc => "Print out statistics on FILEs",
                      args => sub { shift->complete_files(@_); },
                      proc => \&print_stats },
        "cat" =>    { syn => "view" },
        "view" =>   { desc => "View the contents of FILEs",
                      args => sub { shift->complete_onlyfiles(@_); },
                      proc => sub { system('cat', @_); } },
# these demonstrate how parts of Term::ShellUI work:
        echo =>     { desc => "Echoes the command-line arguments",
                      proc => sub { print join(" ", @_), "\n"; } },
        tok =>      { desc => "Print command-line arguments with clear separations",
                      proc => sub { print "<" . join(">, <", @_), ">\n"; } },
        debug_complete => { desc => "Turn on completion debugging",
                      minargs => 1, maxargs => 1, args => "0=off 1=some, 2=more, 3=tons",
                      proc => sub { $term->{debug_complete} = $_[0] },
                    },
    };
}

sub print_stats
{
    for my $file (@_) {
        stat($file) or die "No $file: $!\n";    # die only stops this command
        print "$file has $st_nlink link" . ($st_nlink==1?"":"s") .
            ", and is $st_size byte" . ($st_size==1?"":"s") . " in length.\n";
        print "Inode Last change at: " . localtime($st_ctime) . "\n";
        print "      Last access at: " . localtime($st_atime) . "\n";
        print "    Last modified at: " . localtime($st_mtime) . "\n";
    }
}