52 lines
2.4 KiB
Rust
52 lines
2.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use anyhow::{Context, Result};
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use camino::Utf8Path;
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use std::env;
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/// Generate the rust "scaffolding" required to build a uniffi component.
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///
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/// Given the path to an UDL file, this function will call the `uniffi-bindgen`
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/// command-line tool to generate the `pub extern "C"` functions and other supporting
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/// code required to expose the defined interface from Rust. The expectation is that
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/// this will be called from a crate's build script, and the resulting file will
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/// be `include!()`ed into the build.
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///
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/// This function will attempt to locate and parse a corresponding Cargo.toml to
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/// determine the crate name which will host this UDL.
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///
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/// Given an UDL file named `example.udl`, the generated scaffolding will be written
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/// into a file named `example.uniffi.rs` in the `$OUT_DIR` directory.
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pub fn generate_scaffolding(udl_file: impl AsRef<Utf8Path>) -> Result<()> {
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let udl_file = udl_file.as_ref();
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println!("cargo:rerun-if-changed={udl_file}");
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println!("cargo:rerun-if-env-changed=UNIFFI_TESTS_DISABLE_EXTENSIONS");
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let out_dir = env::var("OUT_DIR").context("$OUT_DIR missing?!")?;
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uniffi_bindgen::generate_component_scaffolding(udl_file, Some(out_dir.as_ref()), false)
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}
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/// Like generate_scaffolding, but uses the specified crate_name instead of locating and parsing
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/// Cargo.toml.
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pub fn generate_scaffolding_for_crate(
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udl_file: impl AsRef<Utf8Path>,
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crate_name: &str,
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) -> Result<()> {
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let udl_file = udl_file.as_ref();
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println!("cargo:rerun-if-changed={udl_file}");
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// The UNIFFI_TESTS_DISABLE_EXTENSIONS variable disables some bindings, but it is evaluated
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// at *build* time, so we need to rebuild when it changes.
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println!("cargo:rerun-if-env-changed=UNIFFI_TESTS_DISABLE_EXTENSIONS");
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// Why don't we just depend on uniffi-bindgen and call the public functions?
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// Calling the command line helps making sure that the generated swift/Kotlin/whatever
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// bindings were generated with the same version of uniffi as the Rust scaffolding code.
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let out_dir = env::var("OUT_DIR").context("$OUT_DIR missing?!")?;
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uniffi_bindgen::generate_component_scaffolding_for_crate(
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udl_file,
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crate_name,
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Some(out_dir.as_ref()),
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false,
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)
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}
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