Merge pull request #2478 from csmoe/explict-version-info

Explict version info

Author: nrc

rustfmt-bin/build.rs

@@ -26,12 +26,20 @@ fn main() {
 // Try to get hash and date of the last commit on a best effort basis. If anything goes wrong
 // (git not installed or if this is not a git repository) just return an empty string.
 fn commit_info() -> String {
-    match (commit_hash(), commit_date()) {
-        (Some(hash), Some(date)) => format!(" ({} {})", hash.trim_right(), date),
+    match (channel(), commit_hash(), commit_date()) {
+        (channel, Some(hash), Some(date)) => format!("{} ({} {})", channel, hash.trim_right(), date),
         _ => String::new(),
     }
 }
 
+fn channel() -> String {
+    if let Ok(channel) = env::var("CFG_RELEASE_CHANNEL") {
+        channel
+    } else {
+        "nightly".to_owned()
+    }
+}
+
 fn commit_hash() -> Option<String> {
     Command::new("git")
         .args(&["rev-parse", "--short", "HEAD"])

rustfmt-bin/src/main.rs

@@ -386,11 +386,14 @@ fn print_usage_to_stdout(opts: &Options, reason: &str) {
 }
 
 fn print_version() {
-    println!(
-        "{}-nightly{}",
+    let version_info = format!(
+        "{}{}{}",
         option_env!("CARGO_PKG_VERSION").unwrap_or("unknown"),
+        "-",
         include_str!(concat!(env!("OUT_DIR"), "/commit-info.txt"))
-    )
+    );
+
+    println!("rustfmt {}", version_info);
 }
 
 fn determine_operation(matches: &Matches) -> FmtResult<Operation> {