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doc: omit revision when it isn't available

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If the revision is empty, then we shouldn't show the `(rev )` text in
the output of `rg --version`.

Fixes #789
This commit is contained in:
Andrew Gallant 2018-02-20 19:46:47 -05:00
parent 8c800adab7
commit fe9be658f4
1 changed files with 7 additions and 2 deletions
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9
build.rs
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@ -58,8 +58,13 @@ fn git_revision_hash() -> Option<String> {
let result = process::Command::new("git") let result = process::Command::new("git")
.args(&["rev-parse", "--short=10", "HEAD"]) .args(&["rev-parse", "--short=10", "HEAD"])
.output(); .output();
result.ok().map(|output| { result.ok().and_then(|output| {
String::from_utf8_lossy(&output.stdout).trim().to_string() let v = String::from_utf8_lossy(&output.stdout).trim().to_string();
if v.is_empty() {
None
} else {
Some(v)
}
}) })
} }