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extern crate capnp;
pub mod schema_capnp;
pub mod codegen;
pub mod codegen_types;
mod pointer_constants;
pub mod schema;
use std::path::{Path, PathBuf};
#[derive(Copy, Clone)]
pub enum RustEdition {
Rust2015,
Rust2018,
}
fn run_command(mut command: ::std::process::Command, path: &PathBuf) -> ::capnp::Result<()> {
let mut p = command.spawn()?;
crate::codegen::generate_code(p.stdout.take().unwrap(), path.as_path())?;
let exit_status = p.wait()?;
if !exit_status.success() {
Err(::capnp::Error::failed(format!(
"Non-success exit status: {}",
exit_status
)))
} else {
Ok(())
}
}
pub struct CompilerCommand {
files: Vec<PathBuf>,
src_prefixes: Vec<PathBuf>,
import_paths: Vec<PathBuf>,
no_standard_import: bool,
output_path: Option<PathBuf>,
}
impl CompilerCommand {
pub fn new() -> CompilerCommand {
CompilerCommand {
files: Vec::new(),
src_prefixes: Vec::new(),
import_paths: Vec::new(),
no_standard_import: false,
output_path: None,
}
}
pub fn file<'a, P>(&'a mut self, path: P) -> &'a mut CompilerCommand
where
P: AsRef<Path>,
{
self.files.push(path.as_ref().to_path_buf());
self
}
pub fn src_prefix<'a, P>(&'a mut self, prefix: P) -> &'a mut CompilerCommand
where
P: AsRef<Path>,
{
self.src_prefixes.push(prefix.as_ref().to_path_buf());
self
}
pub fn import_path<'a, P>(&'a mut self, dir: P) -> &'a mut CompilerCommand
where
P: AsRef<Path>,
{
self.import_paths.push(dir.as_ref().to_path_buf());
self
}
pub fn no_standard_import<'a>(&'a mut self) -> &'a mut CompilerCommand {
self.no_standard_import = true;
self
}
#[deprecated(since = "0.10.0", note = "no longer need to specify rust edition")]
pub fn edition(&mut self, _rust_edition: RustEdition) -> &mut Self {
self
}
pub fn output_path<'a, P>(&'a mut self, path: P) -> &'a mut CompilerCommand
where
P: AsRef<Path>,
{
self.output_path = Some(path.as_ref().to_path_buf());
self
}
pub fn run(&mut self) -> ::capnp::Result<()> {
let mut command = ::std::process::Command::new("capnp");
command.arg("compile").arg("-o").arg("-");
if self.no_standard_import {
command.arg("--no-standard-import");
}
for import_path in &self.import_paths {
command.arg(&format!("--import-path={}", import_path.display()));
}
for src_prefix in &self.src_prefixes {
command.arg(&format!("--src-prefix={}", src_prefix.display()));
}
for file in &self.files {
command.arg(&format!("{}", file.display()));
}
let output_path = if let Some(output_path) = &self.output_path {
output_path.clone()
} else {
PathBuf::from(::std::env::var("OUT_DIR").map_err(|error| {
::capnp::Error::failed(format!(
"Could not access `OUT_DIR` environment variable: {}. \
You might need to set it up or instead create you own output \
structure using `CompilerCommand::output_path`",
error
))
})?)
};
command.stdout(::std::process::Stdio::piped());
command.stderr(::std::process::Stdio::inherit());
run_command(command, &output_path).map_err(|error| {
::capnp::Error::failed(format!(
"Error while trying to execute `capnp compile`: {}. \
Please verify that version 0.5.2 or higher of the capnp executable \
is installed on your system. See https://capnproto.org/install.html",
error
))
})
}
}
#[test]
fn compiler_command_new_no_out_dir() {
let error = CompilerCommand::new().run().unwrap_err().description;
assert!(error.starts_with("Could not access `OUT_DIR` environment variable"));
}
#[test]
fn compiler_command_with_output_path_no_out_dir() {
let error = CompilerCommand::new().output_path("foo").run().unwrap_err().description;
assert!(error.starts_with("Error while trying to execute `capnp compile`"));
}