1 files changed, 91 insertions, 0 deletions
diff --git a/servo/components/style/build.rs b/servo/components/style/build.rs
new file mode 100644
index 0000000000..2247e87618
--- /dev/null
+++ b/servo/components/style/build.rs
@@ -0,0 +1,91 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#[macro_use]
+extern crate lazy_static;
+
+use std::env;
+use std::path::Path;
+use std::process::{exit, Command};
+use walkdir::WalkDir;
+
+#[cfg(feature = "gecko")]
+mod build_gecko;
+
+#[cfg(not(feature = "gecko"))]
+mod build_gecko {
+    pub fn generate() {}
+}
+
+lazy_static! {
+    pub static ref PYTHON: String = env::var("PYTHON3").ok().unwrap_or_else(|| {
+        let candidates = if cfg!(windows) {
+            ["python3.exe"]
+        } else {
+            ["python3"]
+        };
+        for &name in &candidates {
+            if Command::new(name)
+                .arg("--version")
+                .output()
+                .ok()
+                .map_or(false, |out| out.status.success())
+            {
+                return name.to_owned();
+            }
+        }
+        panic!(
+            "Can't find python (tried {})! Try fixing PATH or setting the PYTHON3 env var",
+            candidates.join(", ")
+        )
+    });
+}
+
+fn generate_properties(engine: &str) {
+    for entry in WalkDir::new("properties") {
+        let entry = entry.unwrap();
+        match entry.path().extension().and_then(|e| e.to_str()) {
+            Some("mako") | Some("rs") | Some("py") | Some("zip") => {
+                println!("cargo:rerun-if-changed={}", entry.path().display());
+            },
+            _ => {},
+        }
+    }
+
+    let script = Path::new(&env::var_os("CARGO_MANIFEST_DIR").unwrap())
+        .join("properties")
+        .join("build.py");
+
+    let status = Command::new(&*PYTHON)
+        .arg(&script)
+        .arg(engine)
+        .arg("style-crate")
+        .status()
+        .unwrap();
+    if !status.success() {
+        exit(1)
+    }
+}
+
+fn main() {
+    let gecko = cfg!(feature = "gecko");
+    let servo = cfg!(feature = "servo");
+    let l2013 = cfg!(feature = "servo-layout-2013");
+    let l2020 = cfg!(feature = "servo-layout-2020");
+    let engine = match (gecko, servo, l2013, l2020) {
+        (true, false, false, false) => "gecko",
+        (false, true, true, false) => "servo-2013",
+        (false, true, false, true) => "servo-2020",
+        _ => panic!(
+            "\n\n\
+             The style crate requires enabling one of its 'servo' or 'gecko' feature flags \
+             and, in the 'servo' case, one of 'servo-layout-2013' or 'servo-layout-2020'.\
+             \n\n"
+        ),
+    };
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:out_dir={}", env::var("OUT_DIR").unwrap());
+    generate_properties(engine);
+    build_gecko::generate();
+}