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build.rs
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build.rs
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// Copyright 2019-2022 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT
use heck::AsShoutySnakeCase;
use heck::AsSnakeCase;
use heck::ToSnakeCase;
use once_cell::sync::OnceCell;
use std::{path::Path, sync::Mutex};
static CHECKED_FEATURES: OnceCell<Mutex<Vec<String>>> = OnceCell::new();
// checks if the given Cargo feature is enabled.
fn has_feature(feature: &str) -> bool {
CHECKED_FEATURES
.get_or_init(Default::default)
.lock()
.unwrap()
.push(feature.to_string());
// when a feature is enabled, Cargo sets the `CARGO_FEATURE_<name>` env var to 1
// https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts
std::env::var(format!("CARGO_FEATURE_{}", AsShoutySnakeCase(feature)))
.map(|x| x == "1")
.unwrap_or(false)
}
// creates a cfg alias if `has_feature` is true.
// `alias` must be a snake case string.
fn alias(alias: &str, has_feature: bool) {
if has_feature {
println!("cargo:rustc-cfg={}", alias);
}
}
fn main() {
alias("custom_protocol", has_feature("custom-protocol"));
alias("dev", !has_feature("custom-protocol"));
alias("updater", has_feature("updater"));
let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
let mobile = target_os == "ios" || target_os == "android";
alias("desktop", !mobile);
alias("mobile", mobile);
let api_all = has_feature("api-all");
alias("api_all", api_all);
alias_module(
"fs",
&[
"read-file",
"write-file",
"read-dir",
"copy-file",
"create-dir",
"remove-dir",
"remove-file",
"rename-file",
"exists",
],
api_all,
);
alias_module(
"window",
&[
"create",
"center",
"request-user-attention",
"set-resizable",
"set-title",
"maximize",
"unmaximize",
"minimize",
"unminimize",
"show",
"hide",
"close",
"set-decorations",
"set-always-on-top",
"set-size",
"set-min-size",
"set-max-size",
"set-position",
"set-fullscreen",
"set-focus",
"set-icon",
"set-skip-taskbar",
"set-cursor-grab",
"set-cursor-visible",
"set-cursor-icon",
"set-cursor-position",
"start-dragging",
"print",
],
api_all,
);
alias_module("shell", &["execute", "sidecar", "open"], api_all);
// helper for the command module macro
let shell_script = has_feature("shell-execute") || has_feature("shell-sidecar");
alias("shell_script", shell_script);
alias("shell_scope", has_feature("shell-open-api") || shell_script);
if !mobile {
alias_module(
"dialog",
&["open", "save", "message", "ask", "confirm"],
api_all,
);
}
alias_module("http", &["request"], api_all);
alias("cli", has_feature("cli"));
if !mobile {
alias_module("notification", &[], api_all);
alias_module("global-shortcut", &[], api_all);
}
alias_module("os", &[], api_all);
alias_module("path", &[], api_all);
alias_module("protocol", &["asset"], api_all);
alias_module("process", &["relaunch", "exit"], api_all);
alias_module("clipboard", &["write-text", "read-text"], api_all);
let checked_features_out_path =
Path::new(&std::env::var("OUT_DIR").unwrap()).join("checked_features");
std::fs::write(
&checked_features_out_path,
&CHECKED_FEATURES.get().unwrap().lock().unwrap().join(","),
)
.expect("failed to write checked_features file");
}
// create aliases for the given module with its apis.
// each api is translated into a feature flag in the format of `<module>-<api>`
// and aliased as `<module_snake_case>_<api_snake_case>`.
//
// The `<module>-all` feature is also aliased to `<module>_all`.
//
// If any of the features is enabled, the `<module_snake_case>_any` alias is created.
//
// Note that both `module` and `apis` strings must be written in kebab case.
fn alias_module(module: &str, apis: &[&str], api_all: bool) {
let all_feature_name = format!("{}-all", module);
let all = has_feature(&all_feature_name) || api_all;
alias(&all_feature_name.to_snake_case(), all);
let mut any = all;
for api in apis {
let has = has_feature(&format!("{}-{}", module, api)) || all;
alias(
&format!("{}_{}", AsSnakeCase(module), AsSnakeCase(api)),
has,
);
any = any || has;
}
alias(&format!("{}_any", AsSnakeCase(module)), any);
}