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57 lines
1.4 KiB
Rust
57 lines
1.4 KiB
Rust
//! Printing the version string.
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//!
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//! The code that works out which string to print is done in `build.rs`.
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use std::fmt;
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use crate::options::flags;
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use crate::options::parser::MatchedFlags;
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#[derive(PartialEq, Debug)]
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pub struct VersionString;
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// There were options here once, but there aren’t anymore!
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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)
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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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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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write!(f, "{}", include!(concat!(env!("OUT_DIR"), "/version_string.txt")))
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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 crate::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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