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Use $CARGO_BUILD_TARGET_DIR to determine where output should go #22

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Use $CARGO_BUILD_TARGET_DIR to determine where output should go #22

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39 changes: 26 additions & 13 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -409,8 +409,11 @@ extern crate syn;
extern crate quote;

use std::collections::{HashMap, HashSet};
use std::fs::{File, OpenOptions, create_dir};
use std::io::{Seek, Write};
use std::fs::{create_dir_all, File, OpenOptions};
use std::{
io::{Seek, Write},
path::{Path, PathBuf},
};

use case::CaseExt;
use syn::export::Span;
Expand All @@ -436,6 +439,14 @@ impl Parse for Machine {
}
}

fn path_in_machine_target<P: AsRef<Path>>(relative_name: P) -> PathBuf {
let mut file_name = PathBuf::new();
file_name.push(std::env::var_os("CARGO_BUILD_TARGET_DIR").unwrap_or("target".into()));
file_name.push("machine");
file_name.push(relative_name);
file_name
}

#[proc_macro]
pub fn machine(input: proc_macro::TokenStream) -> syn::export::TokenStream {
let ast = parse_macro_input!(input as Machine);
Expand All @@ -444,9 +455,8 @@ pub fn machine(input: proc_macro::TokenStream) -> syn::export::TokenStream {
let (name, gen) = impl_machine(&ast);

trace!("generated: {}", gen);

let file_name = format!("target/machine/{}.rs", name.to_string().to_lowercase());
let _ = create_dir("target/machine");
let file_name = path_in_machine_target(name.to_string().to_lowercase());
let _ = create_dir_all(file_name.parent().unwrap());
File::create(&file_name)
.and_then(|mut file| {
file.seek(std::io::SeekFrom::End(0))?;
Expand Down Expand Up @@ -647,11 +657,11 @@ impl Parse for Transition {

impl Transitions {
pub fn render(&self) {
let file_name = format!(
"target/machine/{}.dot",
let file_name = path_in_machine_target(format!(
"{}.dot",
self.machine_name.to_string().to_lowercase()
);
let _ = create_dir("target/machine");
));
let _ = create_dir_all(file_name.parent().unwrap());
let mut file = File::create(&file_name).expect("error opening dot file");

file.write_all(format!("digraph {} {{\n", self.machine_name.to_string()).as_bytes())
Expand Down Expand Up @@ -819,8 +829,10 @@ pub fn transitions(input: proc_macro::TokenStream) -> syn::export::TokenStream {

//println!("generated: {:?}", gen);
trace!("generated transitions: {}", stream);
let _ = create_dir("target/machine");
let file_name = format!("target/machine/{}.rs", machine_name.to_string().to_lowercase());
let file_name =
path_in_machine_target(format!("{}.rs", machine_name.to_string().to_lowercase()));
let _ = create_dir_all(file_name.parent().unwrap());

OpenOptions::new()
.create(true)
.write(true)
Expand Down Expand Up @@ -1031,8 +1043,9 @@ pub fn methods(input: proc_macro::TokenStream) -> syn::export::TokenStream {

stream.extend(proc_macro::TokenStream::from(toks));

let file_name = format!("target/machine/{}.rs", machine_name.to_string().to_lowercase());
let _ = create_dir("target/machine");
let file_name =
path_in_machine_target(format!("{}.rs", machine_name.to_string().to_lowercase()));
let _ = create_dir_all(file_name.parent().unwrap());
OpenOptions::new()
.create(true)
.write(true)
Expand Down