mirror of https://github.com/Llewellynvdm/exa.git
124 lines
3.7 KiB
Rust
124 lines
3.7 KiB
Rust
/// The version string isn’t the simplest: we want to show the version,
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/// current Git hash, and compilation date when building *debug* versions, but
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/// just the version for *release* versions so the builds are reproducible.
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///
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/// This script generates the string from the environment variables that Cargo
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/// adds (http://doc.crates.io/environment-variables.html) and runs `git` to
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/// get the SHA1 hash. It then writes the string into a file, which exa then
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/// includes at build-time.
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///
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/// - https://stackoverflow.com/q/43753491/3484614
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/// - https://crates.io/crates/vergen
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use std::env;
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use std::fs::File;
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use std::io::{self, Write};
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use std::path::PathBuf;
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use datetime::{LocalDateTime, ISO};
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/// The build script entry point.
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fn main() -> io::Result<()> {
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#![allow(clippy::write_with_newline)]
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let tagline = "exa - list files on the command-line";
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let url = "https://the.exa.website/";
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let ver =
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if is_debug_build() {
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format!("{}\nv{} \\1;31m(pre-release debug build!)\\0m\n\\1;4;34m{}\\0m", tagline, version_string(), url)
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}
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else if is_development_version() {
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format!("{}\nv{} [{}] built on {} \\1;31m(pre-release!)\\0m\n\\1;4;34m{}\\0m", tagline, version_string(), git_hash(), build_date(), url)
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}
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else {
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format!("{}\nv{}\n\\1;4;34m{}\\0m", tagline, version_string(), url)
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};
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// We need to create these files in the Cargo output directory.
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let out = PathBuf::from(env::var("OUT_DIR").unwrap());
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let path = &out.join("version_string.txt");
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// Bland version text
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let mut f = File::create(path).unwrap_or_else(|_| { panic!("{}", path.to_string_lossy().to_string()) });
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writeln!(f, "{}", strip_codes(&ver))?;
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Ok(())
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}
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/// Removes escape codes from a string.
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fn strip_codes(input: &str) -> String {
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input.replace("\\0m", "")
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.replace("\\1;31m", "")
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.replace("\\1;4;34m", "")
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}
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/// Retrieve the project’s current Git hash, as a string.
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fn git_hash() -> String {
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use std::process::Command;
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String::from_utf8_lossy(
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&Command::new("git")
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.args(&["rev-parse", "--short", "HEAD"])
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.output().unwrap()
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.stdout).trim().to_string()
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}
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/// Whether we should show pre-release info in the version string.
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///
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/// Both weekly releases and actual releases are --release releases,
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/// but actual releases will have a proper version number.
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fn is_development_version() -> bool {
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cargo_version().ends_with("-pre") || env::var("PROFILE").unwrap() == "debug"
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}
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/// Whether we are building in debug mode.
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fn is_debug_build() -> bool {
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env::var("PROFILE").unwrap() == "debug"
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}
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/// Retrieves the [package] version in Cargo.toml as a string.
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fn cargo_version() -> String {
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env::var("CARGO_PKG_VERSION").unwrap()
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}
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/// Returns the version and build parameters string.
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fn version_string() -> String {
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let mut ver = cargo_version();
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let feats = nonstandard_features_string();
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if ! feats.is_empty() {
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ver.push_str(&format!(" [{}]", &feats));
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}
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ver
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}
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/// Finds whether a feature is enabled by examining the Cargo variable.
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fn feature_enabled(name: &str) -> bool {
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env::var(&format!("CARGO_FEATURE_{}", name))
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.map(|e| ! e.is_empty())
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.unwrap_or(false)
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}
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/// A comma-separated list of non-standard feature choices.
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fn nonstandard_features_string() -> String {
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let mut s = Vec::new();
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if feature_enabled("GIT") {
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s.push("+git");
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}
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else {
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s.push("-git");
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}
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s.join(", ")
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}
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/// Formats the current date as an ISO 8601 string.
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fn build_date() -> String {
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let now = LocalDateTime::now();
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format!("{}", now.date().iso())
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}
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