Setup xtasks and add the set-version xtask (#21)

Author: mkaput

.cargo/config.toml

@@ -1,3 +1,4 @@
 [alias]
 lint = "clippy --all-targets --all-features -- --no-deps"
 docs = "doc --all-features --no-deps"
+xtask = "run --quiet --package xtask --"

Cargo.lock

@@ -8,6 +8,9 @@ description = "The Cairo Language Server"
 license = "Apache-2.0"
 repository = "https://github.com/software-mansion/cairols"
 
+[workspace]
+members = ["xtask"]
+
 [features]
 testing = []
 

Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "xtask"
+version = "1.0.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1"
+clap = { version = "4.5", features = ["derive"] }
+semver = "1"
+toml_edit = "0.22.22"
+xshell = "0.2.7"

xtask/Cargo.toml

@@ -0,0 +1,34 @@
+use anyhow::Result;
+use clap::Parser;
+
+macro_rules! command {
+    ($enum_name:ident ( $($module:ident,)+ )) => {
+        $(mod $module;)+
+
+        #[derive(::clap::Subcommand)]
+        #[allow(non_camel_case_types)]
+        enum $enum_name {
+            $($module(crate::$module::Args),)+
+        }
+
+        impl $enum_name {
+            fn main(self) -> ::anyhow::Result<()> {
+                match self {
+                    $(Self::$module(args) => crate::$module::main(args),)+
+                }
+            }
+        }
+    }
+}
+
+command!(Command(set_version,));
+
+#[derive(Parser)]
+struct Args {
+    #[command(subcommand)]
+    command: Command,
+}
+
+fn main() -> Result<()> {
+    Args::parse().command.main()
+}

xtask/src/main.rs

@@ -0,0 +1,71 @@
+use anyhow::{Result, ensure};
+use clap::Parser;
+use semver::{Prerelease, Version};
+use toml_edit::{DocumentMut, value};
+use xshell::{Shell, cmd};
+
+pub fn expected_version() -> Result<Version> {
+    // NOTE: We are deliberately not using cargo_metadata to reduce build times of xtasks.
+
+    let sh = Shell::new()?;
+    let cargo_lock = sh.read_file("Cargo.lock")?.parse::<DocumentMut>()?;
+    let packages = cargo_lock["package"].as_array_of_tables().unwrap();
+    let compiler = {
+        let pkgs = packages
+            .into_iter()
+            .filter(|pkg| pkg["name"].as_str().unwrap() == "cairo-lang-compiler")
+            .collect::<Vec<_>>();
+        ensure!(
+            pkgs.len() == 1,
+            "expected exactly one cairo-lang-compiler package in Cargo.lock, found: {}",
+            pkgs.len()
+        );
+        pkgs.into_iter().next().unwrap()
+    };
+    let compiler_version = compiler["version"].as_str().unwrap();
+    Ok(compiler_version.parse()?)
+}
+
+/// Synchronise the `cairo-language-server` crate version with the `cairo-lang-*` crates.
+#[derive(Default, Parser)]
+pub struct Args {
+    /// Do not edit any files, just inform what would be done.
+    #[arg(long, default_value_t = false)]
+    pub dry_run: bool,
+
+    /// Set a custom value for the `build` metadata.
+    #[arg(long)]
+    pub build: Option<String>,
+
+    /// Clear the pre-release identifier from the version.
+    #[arg(long, default_value_t = false)]
+    pub no_pre_release: bool,
+}
+
+pub fn main(args: Args) -> Result<()> {
+    let sh = Shell::new()?;
+
+    let mut cargo_toml = sh.read_file("Cargo.toml")?.parse::<DocumentMut>()?;
+    let package = cargo_toml["package"].as_table_mut().unwrap();
+
+    let mut version = expected_version()?;
+
+    if let Some(build) = args.build {
+        version.build = build.parse()?;
+    }
+    if args.no_pre_release {
+        version.pre = Prerelease::EMPTY;
+    }
+
+    package["version"] = value(version.to_string());
+
+    eprintln!("[package]\n{package}");
+
+    if !args.dry_run {
+        sh.write_file("Cargo.toml", cargo_toml.to_string())?;
+
+        cmd!(sh, "cargo fetch").run()?;
+    }
+
+    Ok(())
+}