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https://github.com/Llewellynvdm/exa.git
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dbebd60c4e
Some of the deduce functions used to just blatantly call std::env::var_os and not care, introducing global state into a module that was otherwise nice and functional and self-contained. (Well, almost. There’s still terminal width.) Anyway, this made it hard to test, because we couldn’t test it fully with this global dependency in place. It *is* possible to work around this by actually setting the environment variables in the tests, but this way is more self-documenting. With this in place, we can start to unit test things like deriving the view by passing in what the $COLUMNS environment variable should be, and that’s one of the first things checked. src/options/mod.rs *almost* has all its tests moved to where they should be!
61 lines
1.5 KiB
Rust
61 lines
1.5 KiB
Rust
use std::fmt;
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use options::flags;
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use options::parser::MatchedFlags;
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/// All the information needed to display the version information.
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#[derive(PartialEq, Debug)]
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pub struct VersionString {
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/// The version number from cargo.
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cargo: &'static str,
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}
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impl VersionString {
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/// Determines how to show the version, if at all, based on the user’s
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/// command-line arguments. This one works backwards from the other
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/// ‘deduce’ functions, returning Err if help needs to be shown.
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///
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/// Like --help, this doesn’t bother checking for errors.
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pub fn deduce(matches: &MatchedFlags) -> Result<(), VersionString> {
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if matches.count(&flags::VERSION) > 0 {
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Err(VersionString { cargo: env!("CARGO_PKG_VERSION") })
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}
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else {
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Ok(()) // no version needs to be shown
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}
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}
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}
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impl fmt::Display for VersionString {
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/// Format this help options into an actual string of help
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/// text to be displayed to the user.
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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write!(f, "exa v{}", self.cargo)
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}
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}
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#[cfg(test)]
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mod test {
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use options::Options;
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use std::ffi::OsString;
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fn os(input: &'static str) -> OsString {
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let mut os = OsString::new();
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os.push(input);
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os
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}
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#[test]
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fn help() {
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let args = [ os("--version") ];
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let opts = Options::parse(&args, None);
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assert!(opts.is_err())
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}
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}
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