lvgl-rs/lvgl-codegen/build.rs

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Rust
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2020-06-11 20:22:36 +00:00
use cc::Build;
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use std::ffi::OsStr;
use std::process::{Command, Stdio};
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use std::{env, fs, path::Path, path::PathBuf};
static CONFIG_NAME: &str = "DEP_LV_CONFIG_PATH";
fn main() {
let project_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap())
.canonicalize()
.unwrap();
let lvgl_sys = project_dir.join("..").join("lvgl-sys");
let vendor = lvgl_sys.join("vendor");
let lvgl_top_path = vendor.join("lvgl");
let lvgl_src_path = lvgl_top_path.join("src");
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
let lv_config_dir = {
let raw_path = env::var(CONFIG_NAME).unwrap_or_else(|_| {
panic!(
"The environment variable {} is required to be defined",
CONFIG_NAME
);
});
let conf_path = PathBuf::from(raw_path);
if !conf_path.exists() {
panic!(format!(
"Directory referenced by {} needs to exist",
CONFIG_NAME
));
}
if !conf_path.is_dir() {
panic!(format!("{} needs to be a directory", CONFIG_NAME));
}
if !conf_path.join("lv_conf.h").exists() {
panic!(format!(
"Directory referenced by {} needs to contain a file called lv_conf.h",
CONFIG_NAME
));
}
println!(
"cargo:rerun-if-changed={}",
conf_path.join("lv_conf.h").to_str().unwrap()
);
conf_path
};
let build = Build::new();
let tool = build.get_compiler();
let preprocessed = Command::new(tool.path().to_str().unwrap())
.args(&[
"-E",
"-std=c99",
"-DLV_CONF_INCLUDE_SIMPLE",
"-I",
lvgl_top_path.to_string_lossy().as_ref(),
"-I",
lvgl_src_path.to_string_lossy().as_ref(),
"-I",
lv_config_dir.to_string_lossy().as_ref(),
lvgl_top_path.join("lvgl.h").to_string_lossy().as_ref(),
])
.output()
.unwrap();
let content = String::from_utf8(preprocessed.stdout).unwrap();
fs::write(out_path.join("lvgl_full.c"), content).unwrap();
}