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use std::io::prelude::*;
use rustc_serialize::{Encodable, Decodable};
use toml::{self, Encoder, Value};
use core::{Resolve, resolver, Package};
use util::{CargoResult, ChainError, human, Config, Filesystem};
use util::toml as cargo_toml;
pub fn load_pkg_lockfile(pkg: &Package, config: &Config)
-> CargoResult<Option<Resolve>> {
if !pkg.root().join("Cargo.lock").exists() {
return Ok(None)
}
let root = Filesystem::new(pkg.root().to_path_buf());
let mut f = try!(root.open_ro("Cargo.lock", config, "Cargo.lock file"));
let mut s = String::new();
try!(f.read_to_string(&mut s).chain_error(|| {
human(format!("failed to read file: {}", f.path().display()))
}));
(|| {
let table = toml::Value::Table(try!(cargo_toml::parse(&s, f.path(), config)));
let mut d = toml::Decoder::new(table);
let v: resolver::EncodableResolve = try!(Decodable::decode(&mut d));
Ok(Some(try!(v.to_resolve(pkg, config))))
}).chain_error(|| {
human(format!("failed to parse lock file at: {}", f.path().display()))
})
}
pub fn write_pkg_lockfile(pkg: &Package,
resolve: &Resolve,
config: &Config) -> CargoResult<()> {
let mut e = Encoder::new();
resolve.encode(&mut e).unwrap();
let mut out = String::new();
let root = e.toml.get(&"root".to_string()).unwrap();
out.push_str("[root]\n");
emit_package(root.as_table().unwrap(), &mut out);
let deps = e.toml.get(&"package".to_string()).unwrap().as_slice().unwrap();
for dep in deps.iter() {
let dep = dep.as_table().unwrap();
out.push_str("[[package]]\n");
emit_package(dep, &mut out);
}
match e.toml.get(&"metadata".to_string()) {
Some(metadata) => {
out.push_str("[metadata]\n");
out.push_str(&metadata.to_string());
}
None => {}
}
let root = Filesystem::new(pkg.root().to_path_buf());
let orig = root.open_ro("Cargo.lock", config, "Cargo.lock file");
let orig = orig.and_then(|mut f| {
let mut s = String::new();
try!(f.read_to_string(&mut s));
Ok(s)
});
if let Ok(orig) = orig {
if has_crlf_line_endings(&orig) {
out = out.replace("\n", "\r\n");
}
if out == orig {
return Ok(())
}
}
root.open_rw("Cargo.lock", config, "Cargo.lock file").and_then(|mut f| {
try!(f.file().set_len(0));
try!(f.write_all(out.as_bytes()));
Ok(())
}).chain_error(|| {
human(format!("failed to write {}",
pkg.root().join("Cargo.lock").display()))
})
}
fn has_crlf_line_endings(s: &str) -> bool {
if let Some(lf) = s.find('\n') {
s[..lf].ends_with('\r')
} else {
false
}
}
fn emit_package(dep: &toml::Table, out: &mut String) {
out.push_str(&format!("name = {}\n", lookup(dep, "name")));
out.push_str(&format!("version = {}\n", lookup(dep, "version")));
if dep.contains_key("source") {
out.push_str(&format!("source = {}\n", lookup(dep, "source")));
}
if let Some(ref s) = dep.get("dependencies") {
let slice = Value::as_slice(*s).unwrap();
if !slice.is_empty() {
out.push_str("dependencies = [\n");
for child in slice.iter() {
out.push_str(&format!(" {},\n", child));
}
out.push_str("]\n");
}
out.push_str("\n");
} else if dep.contains_key("replace") {
out.push_str(&format!("replace = {}\n\n", lookup(dep, "replace")));
}
}
fn lookup<'a>(table: &'a toml::Table, key: &str) -> &'a toml::Value {
table.get(key).expect(&format!("didn't find {}", key))
}