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extern crate proc_macro;
use quote::{quote};
use syn::{parse_macro_input,DeriveInput};
use std::process::Command;
use std::env;
fn get_time_info() -> String {
let key = "SOURCE_DATE_EPOCH";
if let Some(sde_val) = env::var_os(key) {
if let Some(os_str) = sde_val.to_str() {
let mut oss = os_str.to_string();
if oss.ends_with("\n") {
oss.pop();
oss
} else {
oss
}
} else {
String::new()
}
} else {
let git_commit_command = "git show -s --format=%ct";
let commit_output = if cfg!(target_os = "windows") {
Command::new("cmd")
.args(&["/C", git_commit_command])
.output()
.expect("failed to execute process")
} else {
Command::new("sh")
.arg("-c")
.arg(git_commit_command)
.output()
.expect("failed to execute process")
};
let mut gco = String::from_utf8_lossy(&commit_output.stdout).to_string();
if gco.ends_with("\n") {
gco.pop();
gco
} else {
gco
}
}
}
#[proc_macro_derive(BuildDateTime)]
pub fn build_dt(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
println!("build dt called");
let input = parse_macro_input!(input as DeriveInput);
let name = input.ident;
let time: String = get_time_info();
let expanded = quote! {
impl BuildDateTime for #name {
fn get_build_timestamp(&self) -> &'static str {
#time
}
}
};
proc_macro::TokenStream::from(expanded)
}
fn get_commit_info() -> String {
let git_commit_command = "git show -s --format=%h";
let git_dirty_command = "git diff-index --quiet HEAD --";
let commit_output = if cfg!(target_os = "windows") {
Command::new("cmd")
.args(&["/C", git_commit_command])
.output()
.expect("failed to execute process")
} else {
Command::new("sh")
.arg("-c")
.arg(git_commit_command)
.output()
.expect("failed to execute process")
};
let mut gitoutput = String::from_utf8_lossy(&commit_output.stdout).to_string();
gitoutput.pop();
let dirty_output = if cfg!(target_os = "windows") {
Command::new("cmd")
.args(&["/C", git_dirty_command])
.status()
.expect("failed to execute process")
} else {
Command::new("sh")
.arg("-c")
.arg(git_dirty_command)
.status()
.expect("failed to execute process")
};
let dirty_string = match dirty_output.success() {
true => "clean",
false => "dirty"
};
format!("{}-{}", gitoutput, dirty_string)
}
#[proc_macro_derive(BuildInfo)]
pub fn get_build_commit(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let gitoutput = get_commit_info();
let input = parse_macro_input!(input as DeriveInput);
let name = input.ident;
let expanded = quote! {
impl BuildInfo for #name {
fn get_build_commit(&self) -> &'static str {
#gitoutput
}
}
};
proc_macro::TokenStream::from(expanded)
}