include git commit hash and date in version output (-V)

plus update the CHANGELOG

Author: Jorge Aparicio

CHANGELOG.md

@@ -10,6 +10,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 
 - `itmdump` no longer depends on the `mkfifo` command.
+- `itmdump`, which normally uses named pipes, now fallbacks to regular files to
+  be work on Windows. 
+- `itmdump` now is restrictive with about the arguments it receives. Before, a
+  second argument would simply be ignored, but, now, that has become a hard
+  error.
+- `itmdump` version output (`-V`) now includes the git commit hash and date.
 
 ## v0.1.0 - 2016-10-03
 

Cargo.toml

@@ -1,5 +1,6 @@
 [package]
 authors = ["Jorge Aparicio <[email protected]>"]
+build = "build.rs"
 description = "Tool to parse and dump ITM packets"
 documentation = "https://docs.rs/itm"
 keywords = ["parse", "tool", "ARM", "ITM"]

build.rs

@@ -0,0 +1,46 @@
+use std::env;
+use std::error::Error;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+use std::process::Command;
+
+struct IgnoredError {}
+
+impl<E> From<E> for IgnoredError
+    where E: Error
+{
+    fn from(_: E) -> IgnoredError {
+        IgnoredError {}
+    }
+}
+
+fn main() {
+    let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+
+    File::create(out_dir.join("commit-info.txt"))
+        .unwrap()
+        .write_all(commit_info().as_bytes())
+        .unwrap();
+}
+
+fn commit_info() -> String {
+    match (commit_hash(), commit_date()) {
+        (Ok(hash), Ok(date)) => format!(" ({} {})", hash.trim(), date.trim()),
+        _ => String::new(),
+    }
+}
+
+fn commit_hash() -> Result<String, IgnoredError> {
+    Ok(try!(String::from_utf8(try!(Command::new("git")
+            .args(&["rev-parse", "--short", "HEAD"])
+            .output())
+        .stdout)))
+}
+
+fn commit_date() -> Result<String, IgnoredError> {
+    Ok(try!(String::from_utf8(try!(Command::new("git")
+            .args(&["log", "-1", "--date=short", "--pretty=format:%cd"])
+            .output())
+        .stdout)))
+}

src/bin/itmdump.rs

@@ -56,7 +56,7 @@ fn main() {
 
 fn run() -> Result<()> {
     let matches = App::new("itmdump")
-        .version(env!("CARGO_PKG_VERSION"))
+        .version(include_str!(concat!(env!("OUT_DIR"), "/commit-info.txt")))
         .arg(Arg::with_name("PATH").help("Named pipe to use").required(true))
         .get_matches();