Vendor rawler 0.7.2 unmodified

The crate as crates.io publishes it, minus .cargo-ok, its Cargo.lock and
data/testdata (13 MB of sample files only its own tests read). Not yet
routed through [patch.crates-io]; the next commit is the patch.

third_party/rawler-0.7.2/data/join.rs

@@ -0,0 +1,73 @@
+use std::env;
+use std::fs::File;
+use std::io::prelude::*;
+use std::path::Path;
+
+extern crate glob;
+use self::glob::glob;
+extern crate toml;
+use toml::Value;
+extern crate rustc_version;
+use rustc_version::{Version, version};
+
+fn main() {
+  join_cameras();
+  join_lenses();
+}
+
+fn join_cameras() {
+  let out_dir = env::var("OUT_DIR").expect("Missing ENV OUT_DIR");
+  let dest_path = Path::new(&out_dir).join("cameras.toml");
+  let mut out = File::create(dest_path).expect("Unable to create output file");
+
+  for entry in glob("./data/cameras/*/**/*.toml").expect("Failed to read glob pattern") {
+    out.write_all(b"[[cameras]]\n").expect("Failed to write camera TOML");
+    let path = entry.expect("Invalid glob entry");
+    let mut f = File::open(&path).expect("failed to open camera definition file");
+    let mut toml = String::new();
+    f.read_to_string(&mut toml).expect("Failed to read camera definition file");
+
+    {
+      match toml.parse::<Value>() {
+        Ok(_) => {}
+        Err(e) => panic!("Error parsing {:?}: {:?}", path, e),
+      };
+    }
+
+    out.write_all(&toml.into_bytes()).expect("Failed to write");
+    out.write_all(b"\n").expect("Failed to write");
+  }
+
+  // Check for a minimum version
+  if version().expect("version failed") < Version::parse("1.31.0").expect("version parse failed") {
+    println!("cargo:rustc-cfg=needs_chunks_exact");
+  }
+}
+
+fn join_lenses() {
+  let out_dir = env::var("OUT_DIR").expect("Missing ENV OUT_DIR");
+  let dest_path = Path::new(&out_dir).join("lenses.toml");
+  let mut out = File::create(dest_path).expect("Unable to create output file");
+
+  for entry in glob("./data/lenses/*/**/*.toml").expect("Failed to read glob pattern") {
+    let path = entry.expect("Invalid glob entry");
+    let mut f = File::open(&path).expect("failed to open lens definition file");
+    let mut toml = String::new();
+    f.read_to_string(&mut toml).expect("Failed to read lens definition file");
+
+    {
+      match toml.parse::<Value>() {
+        Ok(_) => {}
+        Err(e) => panic!("Error parsing {:?}: {:?}", path, e),
+      };
+    }
+
+    out.write_all(&toml.into_bytes()).expect("Failed to write");
+    out.write_all(b"\n").expect("Failed to write");
+  }
+
+  // Check for a minimum version
+  if version().expect("version failed") < Version::parse("1.31.0").expect("version parse failed") {
+    println!("cargo:rustc-cfg=needs_chunks_exact");
+  }
+}