cpp-gen

#!/usr/bin/env ruby
require 'erb'
require 'fileutils'
require 'optparse'
require 'slop'
require 'active_support/core_ext/numeric/time'

#
# Templates
#

raw_header_template = <<EOF
//
//  <%= classname %>.<%= header_ext %>
//  <%= project  %>
//
//  Created by <%= author %> on <%= date %>.
//

#ifndef <%= classname %>_<%= header_ext %>
#define <%= classname %>_<%= header_ext %>

class <%= classname %> {

};


#endif  /* <%= classname %>_<%= header_ext %> */

EOF

raw_source_template = <<EOF
//
//  <%= classname %>.cpp
//  <%= project  %>
//
//  Created by <%= author %> on <%= date %>.
//

#include "<%= classname %>.hpp"
EOF

#
#   Option Parsing
#

options = Slop.parse do |o|
    o.banner = "
C++ File Generator
------------------
Usage: cpp-gen [options] <classname>"

    o.string '-p', '--project',     "Specify a project name",   default: File.basename(Dir.pwd)
    o.string '-a', '--author',      "Specify an author's name", default: %x(git config user.name).chomp
    o.string '-t', '--time',        "Gets eval'd by ActiveSupport Time module", default: ""
    o.bool   '-h', '--header-only', "Only create a *.h header file"

    o.on "--header-template", "Prints the raw header template" do
        print_template(raw_header_template, "Header")
        exit
    end

    o.on "--source-template", "Prints the raw source template" do
        print_template(raw_source_template, "Source")
        exit
    end

    o.on '--help', "Shows this message" do
        puts o
        exit
    end
end

if options.arguments.empty?
    puts "Please specify a filename\n\n"
    puts options
    exit(1)
end

# First figure out the project name
project = options[:project]

# Then figure out author
author = options[:author]

# Date/Year
# (gross I know, but eh)
now  = options[:time].empty? ? Time.now : (eval options[:time])
date = now.strftime("%d/%m/%y")

# Parse Filename, and figure out the location
filename = options.arguments.first

classname = File.basename(filename)

source_filename = "#{filename}.cpp"

header_ext      = options.header_only? ? "h" : "hpp"
header_filename = "#{filename}.#{header_ext}"

# Path should be the same
path = File.absolute_path("..", source_filename)

# Make the path and all the parent directories
FileUtils.mkdir_p(path)

# Write header file
header_template = ERB.new(raw_header_template, nil, "-")
File.open(header_filename, "w+") { |f| f.write(header_template.result()) }
puts "Generated file: #{header_filename}"

exit if options.header_only?

# Write source file
source_template = ERB.new(raw_source_template, nil, "-")
File.open(source_filename, "w+") { |f| f.write(source_template.result()) }
puts "Generated file: #{source_filename}"