From aea35fa7e1a3261e5e7a3e8daa999bed3dcd193f Mon Sep 17 00:00:00 2001
From: Till Höppner
Date: Thu, 18 Feb 2016 18:53:30 +0100
Subject: Restructure, add API, add compression

---
 codegen/src/lib.rs | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 codegen/src/lib.rs

(limited to 'codegen/src/lib.rs')

diff --git a/codegen/src/lib.rs b/codegen/src/lib.rs
new file mode 100644
index 0000000..e8a6475
--- /dev/null
+++ b/codegen/src/lib.rs
@@ -0,0 +1,147 @@
+extern crate walkdir;
+extern crate phf_codegen;
+extern crate flate2;
+
+use std::{fmt, env, 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, Debug)]
+pub enum Compression {
+    None,
+    Gzip,
+}
+
+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"),
+        }
+    }
+}
+
+pub struct IncludeDir {
+    files: HashMap<String, (Compression, PathBuf)>,
+    name: String,
+}
+
+pub fn start(static_name: &str) -> IncludeDir {
+    IncludeDir {
+        files: HashMap::new(),
+        name: static_name.to_owned(),
+    }
+}
+
+#[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 {
+    /// 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 {
+            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()));
+            }
+        }
+        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 //accumulate_entries()
+                                  .iter()
+                                  .map(|(name, &(ref comp, ref path))| {
+                                      let include_path = format!("{}",
+                                                                 base_path.join(path).display());
+                                      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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