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lib.rs
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lib.rs
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extern crate serde_json as json;
use std::fs;
use std::path::{Path, PathBuf};
use std::fs::DirEntry;
use std::process;
use std::error::Error;
use std::io::{self, stderr, Write};
use std::convert::From;
use std::result;
use std::fmt::{self, Display};
/// `try!` for `Option`
macro_rules! otry(
($e:expr) => (match $e { Some(e) => e, None => return None })
);
// Special OSX link args
// Without them linker throws a fit about NIF API calls.
#[cfg(target_os="macos")]
static DYLIB_LINKER_ARGS: &'static[&'static str] = &["--", "--codegen", "link-args=-flat_namespace -undefined suppress"];
#[cfg(not(target_os="macos"))]
static DYLIB_LINKER_ARGS: &'static[&'static str] = &[];
static BIN_LINKER_ARGS: &'static[&'static str] = &[];
#[derive(Debug)]
enum MsgError {
Msg(&'static str),
MsgIo(&'static str, io::Error),
}
use MsgError::*;
impl Error for MsgError {
fn description(&self) -> &str {
match self {
&Msg(s) => s,
&MsgIo(s, ref _err) => s,
}
}
}
impl Display for MsgError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&Msg(s) =>
write!(f, "{}", s),
&MsgIo(s, ref err) =>
write!(f, "{} ({})", s, err),
}
}
}
/// Main entry point into this application. Invoked by main() and integration tests
pub fn invoke_with_args_str(args: &[&str], appdir: &Path) {
let args_string: Vec<String> = args.into_iter().cloned().map(From::from).collect();
invoke_with_args(&args_string, appdir)
}
pub fn invoke_with_args(args: &[String], appdir: &Path)
{
match ArgsInfo::from_args(&args) {
Some(ref ai) => invoke(ai, appdir),
None => usage(),
}
}
fn usage() {
writeln!(stderr(), "Usage:").unwrap();
writeln!(stderr(), "\tcargo-erlangapp build [cargo rustc args]").unwrap();
writeln!(stderr(), "\tcargo-erlangapp clean [cargo clean args]").unwrap();
writeln!(stderr(), "\tcargo-erlangapp test [cargo test args]").unwrap();
process::exit(1);
}
fn invoke(argsinfo: &ArgsInfo, appdir: &Path) {
match do_command(argsinfo, appdir) {
Ok(_) => (),
Err(err) => {
writeln!(stderr(), "Error: {}", err).unwrap();
process::exit(1);
}
}
}
fn do_command(argsinfo: &ArgsInfo, appdir: &Path) -> Result<(), MsgError> {
match argsinfo.command {
CargoCommand::Build =>
build_crates(argsinfo, appdir),
CargoCommand::Test =>
test_crates(argsinfo, appdir),
CargoCommand::Clean =>
clean_crates(argsinfo, appdir),
}
}
fn build_crates(argsinfo: &ArgsInfo, appdir: &Path) -> Result<(), MsgError> {
// build(rustc) each crate
for crate_dir in try!(enumerate_crate_dirs(appdir)).iter() {
for target in try!(enumerate_targets(crate_dir)).into_iter() {
println!("Building {}", crate_dir.to_string_lossy());
// args for build target
let mut rustc_args: Vec<String> = match target {
Target::Bin(ref s) => vec!("--bin".to_string(), s.to_string()),
Target::Dylib(_) => vec!("--lib".to_string()), // only 1 lib permitted per crate, name is implicit
};
// args from commandline
rustc_args.extend(argsinfo.cargo_args.iter().cloned());
// linker args
rustc_args.extend(linker_args(&target).iter().map(|x|x.to_string()));
// build it!
try!(cargo_command("rustc", rustc_args.as_slice(), crate_dir));
// copy artifacts to priv/crates/<cratename>
let (dst_name, src_name) = target_filenames(&target);
// build src path
let mut src_path = crate_dir.join("target");
if let Some(ref target_arch) = argsinfo.target {
src_path.push(target_arch);
}
src_path.push( match argsinfo.build_type {
BuildType::Release => "release",
_ => "debug",
});
src_path.push(src_name);
// build dst path
let mut dst_path = appdir.join("priv");
dst_path.push("crates");
dst_path.push(crate_dir.file_name().unwrap()); // filename will be valid if rustc worked
try!(fs::create_dir_all(&dst_path)
.map_err(|err| MsgIo("cannot create dest directories in priv/", err)));
dst_path.push(dst_name);
// finally, copy the artifact with its new name.
try!(fs::copy(src_path, dst_path)
.map_err(|err| MsgIo("cannot copy artifact", err)));
}
};
Ok(())
}
fn linker_args(target: &Target) -> &'static [&'static str] {
match *target {
Target::Dylib(_) => DYLIB_LINKER_ARGS,
Target::Bin(_) => BIN_LINKER_ARGS,
}
}
/// OS X naming
///
/// Dylibs have `lib` prefix, and `.dylib` suffix gets changed to `.so`.
#[cfg(target_os="macos")]
pub fn target_filenames(target: &Target) -> (String, String) {
match *target {
Target::Bin(ref s) => (s.to_string(), s.to_string()),
Target::Dylib(ref s) => ("lib".to_string() + s + ".so", "lib".to_string() + s + ".dylib"),
}
}
/// Windows naming
///
/// Bins have `.exe` suffix, dylibs have `.dll` suffix.
#[cfg(windows)]
pub fn target_filenames(target: &Target) -> (String, String) {
match *target {
Target::Bin(ref s) => (s.to_string() + ".exe", s.to_string() + ".exe"),
Target::Dylib(ref s) => (s.to_string() + ".dll", s.to_string() + ".dll"),
}
}
/// Non-windows, non-OSX nameing
///
/// Dylibs have `lib` prefix and `.so` suffix.
#[cfg(all(unix, not(target_os="macos")))]
pub fn target_filenames(target: &Target) -> (String, String) {
match *target {
Target::Bin(ref s) => (s.to_string(), s.to_string()),
Target::Dylib(ref s) => ("lib".to_string() + s + ".so", "lib".to_string() + s + ".so"),
}
}
/// Build artifact types
#[derive(Debug)]
pub enum Target {
Bin(String),
Dylib(String),
}
impl AsRef<String> for Target {
fn as_ref(&self) -> &String {
match *self {
Target::Bin(ref s) => s,
Target::Dylib(ref s) => s,
}
}
}
impl Target {
/// Create target from cargo manifest fragment
fn from_json(obj: &json::Value) -> Option<Target> {
let name = otry!(obj.find("name")
.and_then(|s| s.as_string())
.map(|s| s.to_string()));
let kinds: Vec<&str> = otry!(obj.find("kind")
.and_then(|s| s.as_array())
.map(|arr| arr.iter()
.filter_map( |s| s.as_string())
.collect()));
if kinds.contains(&"bin") {
Some(Target::Bin(name))
} else if kinds.contains(&"dylib") || kinds.contains(&"cdylib"){
Some(Target::Dylib(name))
} else {
None
}
}
}
/// Read manifest for given crate and enumerate targets
fn enumerate_targets(crate_dir: &Path) -> Result<Vec<Target>, MsgError> {
let output = try!(process::Command::new("cargo").arg("read-manifest")
.current_dir(crate_dir)
.output()
.map_err(|err| MsgIo("Cannot read crate manifest",err)));
enumerate_targets_opt(output.stdout.as_slice())
.ok_or(Msg("Cannot parse crate manifest"))
}
/// Parse "targets" portion of JSON text to extract targets
fn enumerate_targets_opt(json_slice: &[u8]) -> Option<Vec<Target>> {
let value: json::Value = otry!(json::from_slice(json_slice).ok());
value.find("targets")
.and_then(|v| v.as_array()) // :Option<Vec<Value>>
.map(|targets|
targets
.iter()
.filter_map(Target::from_json) // :Vec<Target>
.collect())
}
/// Test all crates
fn test_crates(argsinfo: &ArgsInfo, appdir: &Path) -> Result<(), MsgError> {
// test each create, short circuit fail
for crate_dir in try!(enumerate_crate_dirs(appdir)).iter() {
println!("Testing {}", crate_dir.to_string_lossy());
try!(cargo_command("test", &argsinfo.cargo_args, crate_dir));
};
Ok(())
}
/// Clean all crates, remote artifacts in `priv/`
fn clean_crates(argsinfo: &ArgsInfo, appdir: &Path) -> Result<(), MsgError> {
// clean all crate dirs
for crate_dir in try!(enumerate_crate_dirs(appdir)).iter() {
println!("Cleaning {}", crate_dir.to_string_lossy());
try!(cargo_command("clean", &argsinfo.cargo_args, crate_dir));
};
// clean priv/crates
let output_dir = appdir.join("priv").join("crates");
remove_dir_all_force(output_dir).map_err(|err| MsgIo("can't delete output dir", err))
}
// Remove dir. The dir being absent is not an error.
fn remove_dir_all_force<P: AsRef<Path>>(path: P) -> io::Result<()> {
match fs::metadata(path.as_ref()) {
Err(err) => {
match err.kind() {
io::ErrorKind::NotFound => Ok(()), // not finding is okay (already cleaned)
_ => Err(err), // permission error on parent dir?
}
},
Ok(m) => {
match m.is_dir() {
true => fs::remove_dir_all(path),
false => Ok(()),
}
},
}
}
fn cargo_command(cmd: &str, args: &[String], dir: &Path) -> Result<(), MsgError> {
process::Command::new("cargo")
.arg(cmd)
.args(args)
.current_dir(dir)
.status()
.map_err(|err| MsgIo("cannot start cargo", err))
.and_then(|status| {
match status.success() {
true => Ok(()),
false => Err(Msg("cargo command failed")),
}
})
}
fn enumerate_crate_dirs(appdir: &Path) -> Result<Vec<PathBuf>, MsgError> {
appdir
.join("crates") // :PathBuf
.read_dir() // :Result<ReadDir>
.map_err(|err|
MsgIo("Cannot read 'crates' directory", err)
)
.map(|dirs|
dirs.filter_map(result::Result::ok) // discard Error entries and unwrap
.filter(is_crate) // discard non-crate entries
.map(|x| x.path()) // take whole path
.collect()
)
}
fn is_crate(dirent: &DirEntry) -> bool {
let mut toml_path = dirent.path();
toml_path.push("Cargo.toml");
toml_path
.metadata() // :Result<Metadata>
.map(|x| x.is_file()) // :Result<bool>
.unwrap_or(false)
}
#[derive(Debug)]
enum CargoCommand { Build, Test, Clean }
#[derive(Debug)]
enum BuildType { Release, Debug, DefaultDebug }
#[derive(Debug)]
pub struct ArgsInfo {
command: CargoCommand,
target: Option<String>,
build_type: BuildType,
cargo_args: Vec<String>,
}
impl ArgsInfo {
pub fn from_args(args: &[String]) -> Option<ArgsInfo> {
if args.len() < 2 {
return None;
}
let build_type =
if find_option(args, "--release") { BuildType::Release }
else if find_option(args, "--debug") { BuildType::Debug }
else { BuildType::DefaultDebug };
Some(ArgsInfo {
command: otry!(parse_cmd_name(args[1].as_str())),
target: find_option_value(&args[2..], "--target").map(Into::into),
build_type: build_type,
cargo_args: args[2..].into_iter().cloned().collect(),
})
}
}
fn parse_cmd_name(arg: &str) -> Option<CargoCommand> {
match arg {
"build" => Some(CargoCommand::Build),
"test" => Some(CargoCommand::Test),
"clean" => Some(CargoCommand::Clean),
_ => None,
}
}
fn find_option(args: &[String], key: &str) -> bool {
args.iter().any(|x| **x == *key)
}
/// Search args for "key=value", "key= value", "key =value", or "key = value"
pub fn find_option_value(args: &[String], key: &str) -> Option<String> {
let mut i = args.iter();
loop {
let arg0 = otry!(i.next());
if arg0.starts_with(key) {
// check 'key=value'
match arg0.split('=').nth(1) { // try to get "value"
Some("") => return i.next().map(Clone::clone), // "key= value"
Some(x) => return Some(x.to_string()), // "key=value"
None => {
if **arg0 == *key { // "key =.."
let arg1 = otry!(i.next());
if **arg1 == *"=" { return i.next().map(Clone::clone) } // "key = value"
if arg1.starts_with('=') {
return arg1.split('=').nth(1).map(From::from) // "key =value"
}
// something else, drop through and loop
}
}
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
fn find_option_value_wrapper(args: &[&str], key: &str) -> Option<String> {
let argsv: Vec<String> = args.into_iter().cloned().map(From::from).collect();
find_option_value(&argsv, key)
}
#[test]
fn test_find_option_value() {
assert_eq!(None, find_option_value_wrapper(&[], "key"));
assert_eq!(None, find_option_value_wrapper(&["asdfasdfasdfsdf"], "key"));
assert_eq!(None, find_option_value_wrapper(&["asdfasdfasdfsdf", "sdfsf"], "key"));
assert_eq!(None, find_option_value_wrapper(&["asdfasdfasdfsdf", "sdfsf", "sdfsdf"], "key"));
assert_eq!(Some("value".to_string()), find_option_value_wrapper(&["key=value"], "key"));
assert_eq!(Some("value".to_string()), find_option_value_wrapper(&["key", "=value"], "key"));
assert_eq!(Some("value".to_string()), find_option_value_wrapper(&["key=", "value"], "key"));
assert_eq!(Some("value".to_string()), find_option_value_wrapper(&["key", "=", "value"], "key"));
assert_eq!(None, find_option_value_wrapper(&["key", "value"], "key"));
assert_eq!(None, find_option_value_wrapper(&["key", "="], "key"));
assert_eq!(None, find_option_value_wrapper(&["key"], "key"));
assert_eq!(None, find_option_value_wrapper(&["key="], "key"));
}
}