feat(main): write proper header

clog does now support --setversion and
--subtitle parameters.

E.g. --setversion=1.12.0 --subtitle=crazy-dog

src/log_writer.rs

@@ -1,5 +1,6 @@
 use std::collections::hashmap::HashMap;
 use std::io::Writer;
+use time::now_utc;
 use common::{ LogEntry };
 
 pub struct LogWriter<'a> {
@@ -8,7 +9,9 @@ pub struct LogWriter<'a> {
 }
 
 pub struct LogWriterOptions<'a> {
-    pub repository_link: String
+    pub repository_link: String,
+    pub version: String,
+    pub subtitle: String
 }
 
 impl<'a> LogWriter<'a> {
@@ -23,6 +26,27 @@ impl<'a> LogWriter<'a> {
         }
     }
 
+    pub fn write_header (&mut self) {
+
+        let subtitle = match self.options.subtitle.len() {
+            0 => self.options.subtitle.clone(),
+            _ => format!(" {}", self.options.subtitle)
+        };
+
+        let version_text = format!("## {}{}", self.options.version, subtitle);
+
+        fn get_date () -> String {
+            now_utc().strftime("%Y-%m-%d")
+        }
+
+        if self.options.repository_link.len() > 0 {
+            self.writer.write(format!("{} ({})\n\n", version_text, get_date()).as_bytes());
+        }
+        else {
+            self.writer.write(format!("<a name=\"{}\"</a>\n{} ({})\n\n", self.options.version, version_text, get_date()).as_bytes());
+        }
+    }
+
     pub fn write_section (&mut self, title: &str, section: &HashMap<String, Vec<LogEntry>>) {
 
         if section.len() == 0 {

src/main.rs

@@ -9,6 +9,7 @@ extern crate regex_macros;
 extern crate serialize;
 #[phase(plugin)] extern crate docopt_macros;
 extern crate docopt;
+extern crate time;
 
 use git::{ LogReaderConfig, get_commits };
 use log_writer::{ LogWriter, LogWriterOptions };
@@ -24,7 +25,7 @@ mod section_builder;
 docopt!(Args, "clog
 
                Usage:
-                 clog [--repository=<link>]
+                 clog [--repository=<link> --setversion=<version> --subtitle=<subtitle>]
 
                Options:
                   -h --help     Show this screen.
@@ -46,9 +47,12 @@ fn main () {
     let sections = build_sections(commits.clone());
     let mut file = File::open_mode(&Path::new("changelog.md"), Open, Write).ok().unwrap();
     let mut writer = LogWriter::new(&mut file, LogWriterOptions { 
-        repository_link: args.flag_repository 
+        repository_link: args.flag_repository,
+        version: args.flag_setversion,
+        subtitle: args.flag_subtitle
     });
 
+    writer.write_header();
     writer.write_section("Bug Fixes", &sections.fixes);
     writer.write_section("Features", &sections.features);
     //println!("{}", commits);