add option for output file, update readme

README.md

@@ -6,32 +6,34 @@ Github Changelog Generator
 This script automatically generate change-log from your tags and merged pull-requests.
 
 ## Installation:
-`gem install github_changelog_generator`
+	gem install github_changelog_generator
 
-## Usage:
+## Usage
 
 ### Example usage:
-`github_changelog_generator -u github-username -p github-project`
+	github_changelog_generator -u github-username -p github-project
 
-In output you will get `[your_project]_CHANGELOG.md` file with *pretty Markdown-formatted* changelogs in your current directory.
+In output you will get `CHANGELOG.md` file with *pretty Markdown-formatted* changelogs in your current directory.
 
 ### Params:
-    github_changelog_generator -u user_name -p project_name [-t 16-digit-GitHubToken] [options]
-	    -u, --user [USER]                your username on GitHub
-	    -p, --project [PROJECT]          name of project on GitHub
-	    -t, --token [TOKEN]              To make more than 50 requests this app required your OAuth token for GitHub. You can generate it on https://github.com/settings/applications
+See `github_changelog_generator --help` for detailed usage.
+
+	Usage: changelog_generator --user username --project project_name [options]
+	    -u, --user [USER]                Username of the owner of target GitHub repo (required)
+	    -p, --project [PROJECT]          Name of project on GitHub (required)
+	    -t, --token [TOKEN]              To make more than 50 requests this script required your OAuth token for GitHub. You can generate it on https://github.com/settings/applications
 	    -h, --help                       Displays Help
 	    -v, --[no-]verbose               Run verbosely
-	    -l, --last-changes               generate log between last 2 tags
-	    -f, --date-format [FORMAT]       date format. default is %d/%m/%y 
-
+	    -l, --last-changes               Generate log between only last 2 tags
+	    -f, --date-format [FORMAT]       Date format. Default is %d/%m/%y
+	    -o, --output [FORMAT]            Output file. Default is CHANGELOG.md
 
 ## Real examples:
 ### [This changelog](https://github.com/skywinder/ActionSheetPicker-3.0/blob/master/CHANGELOG.md) was generated by 
 `github_changelog_generator -u skywinder -p ActionSheetPicker-3.0`: [ActionSheetPicker-3.0/CHANGELOG.md](https://github.com/skywinder/ActionSheetPicker-3.0/blob/master/CHANGELOG.md)
 
 ## FAQ
-Since GitHub allow to make only 50 requests without authentication it's recommended to run this scrip with key `-t [your 16 digit token]` that you can easily **[generate here](https://github.com/settings/applications)**.
+Since GitHub allow to make only 50 requests without authentication it's recommended to run this scrip with key `-t [your 16 digit token]` that you can easily **[generate it here](https://github.com/settings/applications)**.
 
 So, if you got error like this:
 >! /Library/Ruby/Gems/2.0.0/gems/github_api-0.12.2/lib/github_api/response/raise_error.rb:14:in `on_complete': GET https://api.github.com/repos/skywinder/ActionSheetPicker-3.0/git/commits/89678f7d7f66873c858e6cb07bf697192aca6768: 403 API rate limit exceeded for 195.88.177.9. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.) (Github::Error::Forbidden) 

lib/github_changelog_generator.rb

@@ -88,7 +88,8 @@ class ChangelogGenerator
     end
 
     log += "\n\n*This file was generated by [github_changelog_generator](https://github.com/skywinder/Github-Changelog-Generator)*"
-    output_filename = "#{@options[:project]}_CHANGELOG.md"
+
+    output_filename = "#{@options[:output]}"
     File.open(output_filename, 'w') { |file| file.write(log) }
 
     puts "Done! Generated log placed in #{output_filename}"

lib/github_changelog_generator/parser.rb

@@ -3,17 +3,17 @@ require 'optparse'
 
 class Parser
   def self.parse_options
-    options = {:tag1 => nil, :tag2 => nil, :format => '%d/%m/%y'}
+    options = {:tag1 => nil, :tag2 => nil, :format => '%d/%m/%y', :output => 'CHANGELOG.md'}
 
     parser = OptionParser.new { |opts|
-      opts.banner = 'Usage: changelog_generator -u user_name -p project_name [-t 16-digit-GitHubToken] [options]'
-      opts.on('-u', '--user [USER]', 'your username on GitHub') do |last|
+      opts.banner = 'Usage: changelog_generator --user username --project project_name [options]'
+      opts.on('-u', '--user [USER]', 'Username of the owner of target GitHub repo (required)') do |last|
         options[:user] = last
       end
-      opts.on('-p', '--project [PROJECT]', 'name of project on GitHub') do |last|
+      opts.on('-p', '--project [PROJECT]', 'Name of project on GitHub (required)') do |last|
         options[:project] = last
       end
-      opts.on('-t', '--token [TOKEN]', 'To make more than 50 requests this app required your OAuth token for GitHub. You can generate it on https://github.com/settings/applications') do |last|
+      opts.on('-t', '--token [TOKEN]', 'To make more than 50 requests this script required your OAuth token for GitHub. You can generate it on https://github.com/settings/applications') do |last|
         options[:token] = last
       end
       opts.on('-h', '--help', 'Displays Help') do
@@ -23,12 +23,15 @@ class Parser
       opts.on('-v', '--[no-]verbose', 'Run verbosely') do |v|
         options[:verbose] = v
       end
-      opts.on('-l', '--last-changes', 'generate log between last 2 tags') do |last|
+      opts.on('-l', '--last-changes', 'Generate log between only last 2 tags') do |last|
         options[:last] = last
       end
-      opts.on('-f', '--date-format [FORMAT]', 'date format. default is %d/%m/%y') do |last|
+      opts.on('-f', '--date-format [FORMAT]', 'Date format. Default is %d/%m/%y') do |last|
         options[:format] = last
       end
+      opts.on('-o', '--output [FORMAT]', 'Output file. Default is CHANGELOG.md') do |last|
+        options[:output] = last
+      end
     }
 
     parser.parse!