refactor: split cargo workspace

crates/pango/build.rs

@@ -0,0 +1,85 @@
+use {
+    repc::layout::{Type, TypeVariant},
+    std::{
+        env,
+        fs::{File, OpenOptions},
+        io::{self, BufWriter, Write},
+        path::PathBuf,
+    },
+};
+
+#[allow(unused_macros)]
+macro_rules! cenum {
+    ($name:ident, $uc:ident; $($name2:ident = $val:expr,)*) => {
+        #[derive(Copy, Clone, Debug, Eq, PartialEq)]
+        pub struct $name(pub i32);
+
+        impl $name {
+            pub fn raw(self) -> i32 {
+                self.0
+            }
+        }
+
+        $(
+            pub const $name2: $name = $name($val);
+        )*
+
+        pub const $uc: &[i32] = &[$($val,)*];
+    };
+}
+
+#[path = "src/consts.rs"]
+mod consts;
+
+fn open(s: &str) -> io::Result<BufWriter<File>> {
+    let mut path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    path.push(s);
+    Ok(BufWriter::new(
+        OpenOptions::new()
+            .create(true)
+            .write(true)
+            .truncate(true)
+            .open(path)?,
+    ))
+}
+
+fn get_target() -> repc::Target {
+    let rustc_target = env::var("TARGET").unwrap();
+    repc::TARGET_MAP
+        .iter()
+        .cloned()
+        .find(|t| t.0 == rustc_target)
+        .unwrap()
+        .1
+}
+
+fn get_enum_ty(variants: Vec<i128>) -> anyhow::Result<u64> {
+    let target = get_target();
+    let ty = Type {
+        layout: (),
+        annotations: vec![],
+        variant: TypeVariant::Enum(variants),
+    };
+    let ty = repc::compute_layout(target, &ty)?;
+    assert!(ty.layout.pointer_alignment_bits <= ty.layout.size_bits);
+    Ok(ty.layout.size_bits)
+}
+
+fn write_ty<W: Write>(f: &mut W, vals: &[i32], ty: &str) -> anyhow::Result<()> {
+    let variants: Vec<_> = vals.iter().cloned().map(|v| v as i128).collect();
+    let size = get_enum_ty(variants)?;
+    writeln!(f, "#[allow(clippy::allow_attributes, dead_code)]")?;
+    writeln!(f, "pub type {} = i{};", ty, size)?;
+    Ok(())
+}
+
+fn main() -> anyhow::Result<()> {
+    let mut f = open("pango_tys.rs")?;
+    write_ty(&mut f, consts::CAIRO_FORMATS, "cairo_format_t")?;
+    write_ty(&mut f, consts::CAIRO_STATUSES, "cairo_status_t")?;
+    write_ty(&mut f, consts::CAIRO_OPERATORS, "cairo_operator_t")?;
+    write_ty(&mut f, consts::PANGO_ELLIPSIZE_MODES, "PangoEllipsizeMode_")?;
+
+    println!("cargo:rerun-if-changed=src/consts.rs");
+    Ok(())
+}