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extern crate walkdir;
extern crate phf_codegen;
extern crate flate2;
use std::{env, fmt, io};
use std::borrow::{Borrow, Cow};
use std::collections::HashMap;
use std::fs::{self, File};
use std::io::{BufReader, BufWriter, Write};
use std::path::{Path, PathBuf};
use walkdir::WalkDir;
use flate2::FlateWriteExt;
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum Compression {
None,
Gzip,
Passthrough,
}
impl fmt::Display for Compression {
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
Compression::None => fmt.write_str("None"),
Compression::Gzip => fmt.write_str("Gzip"),
Compression::Passthrough => panic!("Should not be called"),
}
}
}
pub struct IncludeDir {
files: HashMap<String, (Compression, PathBuf)>,
name: String,
passthrough: bool,
}
pub fn start(static_name: &str) -> IncludeDir {
IncludeDir {
files: HashMap::new(),
name: static_name.to_owned(),
passthrough: false,
}
}
#[cfg(windows)]
fn as_key(path: &str) -> Cow<str> {
Cow::Owned(path.replace("\\", "/"))
}
#[cfg(not(windows))]
fn as_key(path: &str) -> Cow<str> {
Cow::Borrowed(path)
}
impl IncludeDir {
/// Don't include any data, but read from the source directory instead.
pub fn passthrough(&mut self) -> &mut IncludeDir {
self.passthrough = true;
self
}
/// Add a single file to the binary.
/// With Gzip compression, the file will be encoded to OUT_DIR first.
/// For chaining, it's not sensible to return a Result. If any to-be-included
/// files can't be found, or encoded, this function will panic!.
pub fn file<P: AsRef<Path>>(&mut self, path: P, comp: Compression) -> &mut IncludeDir {
self.add_file(path, comp).unwrap();
self
}
/// ## Panics
///
/// This function panics when CARGO_MANIFEST_DIR or OUT_DIR are not defined.
pub fn add_file<P: AsRef<Path>>(&mut self, path: P, comp: Compression) -> io::Result<()> {
let key = path.as_ref().to_string_lossy();
match comp {
c if self.passthrough || c == Compression::Passthrough => {
self.files.insert(as_key(key.borrow()).into_owned(),
(Compression::Passthrough, PathBuf::new()));
}
Compression::None => {
self.files.insert(as_key(key.borrow()).into_owned(),
(comp, path.as_ref().clone().to_owned()));
}
Compression::Gzip => {
// gzip encode file to OUT_DIR
let in_path = Path::new(&env::var("CARGO_MANIFEST_DIR").unwrap()).join(&path);
let mut in_file = BufReader::new(try!(File::open(&in_path)));
let out_path = Path::new(&env::var("OUT_DIR").unwrap()).join(&path);
try!(fs::create_dir_all(&out_path.parent().unwrap()));
let out_file = BufWriter::new(try!(File::create(&out_path)));
let mut encoder = out_file.gz_encode(flate2::Compression::Default);
try!(io::copy(&mut in_file, &mut encoder));
self.files.insert(as_key(key.borrow()).into_owned(),
(comp, out_path.to_owned()));
}
_ => unreachable!(),
}
Ok(())
}
/// Add a whole directory recursively to the binary.
/// This function calls `file`, and therefore will panic! on missing files.
pub fn dir<P: AsRef<Path>>(&mut self, path: P, comp: Compression) -> &mut IncludeDir {
self.add_dir(path, comp).unwrap();
self
}
/// ## Panics
///
/// This function panics when CARGO_MANIFEST_DIR or OUT_DIR are not defined.
pub fn add_dir<P: AsRef<Path>>(&mut self, path: P, comp: Compression) -> io::Result<()> {
for entry in WalkDir::new(path).follow_links(true).into_iter() {
match entry {
Ok(ref e) if !e.file_type().is_dir() => {
try!(self.add_file(e.path(), comp));
}
_ => (),
}
}
Ok(())
}
pub fn build(&self, out_name: &str) -> io::Result<()> {
let base_path = Path::new(&env::var("CARGO_MANIFEST_DIR").unwrap()).to_owned();
let out_path = Path::new(&env::var("OUT_DIR").unwrap()).join(out_name);
let mut out_file = BufWriter::new(try!(File::create(&out_path)));
try!(write!(&mut out_file,
"use includedir::*;\n\
pub static {}: Files = Files {{\n\
\tfiles: ",
self.name));
let entries: Vec<_> = self.files
.iter()
.map(|(name, &(ref comp, ref path))| {
let include_path = format!("{}",
base_path.join(path).display());
if comp == &Compression::Passthrough {
(as_key(&name).into_owned(),
"(Compression::Passthrough, &[] as &'static [u8])"
.to_owned())
} else {
let code = format!("(Compression::{}, \
include_bytes!(\"{}\") as &'static \
[u8])",
comp,
as_key(&include_path));
(as_key(&name).into_owned(), code)
}
})
.collect();
let mut map: phf_codegen::Map<&str> = phf_codegen::Map::new();
for &(ref name, ref code) in &entries {
map.entry(&name, &code);
}
try!(map.build(&mut out_file));
try!(write!(&mut out_file, "\n}};\n"));
Ok(())
}
}
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