Add pkg-config stuff (#14)

Reviewed-on: http://192.168.1.227:3000/sfrembling/pallet/pulls/14
Co-authored-by: godsfryingpan <sfrembling@gmail.com>
Co-committed-by: godsfryingpan <sfrembling@gmail.com>

src/app.rs

@@ -55,6 +55,11 @@ enum Subcommand {
     },
     /// List available build modes
     List,
+    /// Add a new package to the project (throguh pkg-config)
+    Add {
+        /// The package to be added
+        package: String,
+    },
 }
 
 #[derive(clap::Subcommand)]
@@ -168,8 +173,67 @@ impl App {
                     std::process::exit(1);
                 }
             }
+            Subcommand::Add { package } => {
+                if let Err(e) = add_package(&package) {
+                    eprintln!("Error adding package {package} to project: {e}");
+                    std::process::exit(1);
                 }
             }
+        }
+    }
+}
+
+fn add_package(package: &str) -> std::io::Result<()> {
+    let status = Command::new("pkg-config")
+        .arg("--exists")
+        .arg(&package)
+        .status()
+        .map_err(|_| {
+            std::io::Error::new(
+                std::io::ErrorKind::NotFound,
+                "pkg-config not found - please install it first",
+            )
+        })?;
+
+    if !status.success() {
+        eprintln!(
+            "  {} pkg-config could not find package '{package}'",
+            "Error".red().bold()
+        );
+        eprintln!(
+            "  {} try installing the development package for '{package}', e.g.:",
+            "Hint".yellow().bold()
+        );
+        eprintln!("       Arch:   sudo pacman -S {package}");
+        eprintln!("       Debian: sudo apt install lib{package}-dev");
+        std::process::exit(1);
+    }
+
+    let mut conf = get_config().ok_or(std::io::Error::new(
+        std::io::ErrorKind::NotFound,
+        "no Pallet.toml found in local directory",
+    ))?;
+
+    let deps = conf.dependencies.get_or_insert_with(Vec::new);
+
+    if deps.contains(&package.to_owned()) {
+        println!(
+            "  {} '{package}' is already a dependency",
+            "Warning".yellow().bold()
+        );
+        return Ok(());
+    }
+
+    deps.push(package.to_owned());
+
+    std::fs::write(
+        "Pallet.toml",
+        toml::to_string_pretty(&conf).expect("valid TOML"),
+    )?;
+
+    println!("  {} {package}", "Added".green().bold());
+
+    Ok(())
 }
 
 fn gen_compile_commands(mode: &Option<String>) -> std::io::Result<()> {
@@ -314,6 +378,50 @@ fn build(mode: &Option<String>, force_recompile: bool) -> std::io::Result<()> {
 
     let compiler = conf.compiler.as_deref().unwrap_or("gcc");
 
+    let mut extra_compile_flags: Vec<String> = Vec::new();
+    let mut extra_link_flags: Vec<String> = Vec::new();
+
+    if let Some(deps) = &conf.dependencies {
+        if !deps.is_empty() {
+            let cflags = Command::new("pkg-config")
+                .arg("--cflags")
+                .args(deps)
+                .output()
+                .map_err(|_| {
+                    std::io::Error::new(std::io::ErrorKind::NotFound, "pkg-config not found")
+                })?;
+            if !cflags.status.success() {
+                return Err(std::io::Error::new(
+                    std::io::ErrorKind::Other,
+                    "pkg-config --cflags failed - is the package installed?",
+                ));
+            }
+
+            let libs = Command::new("pkg-config")
+                .arg("--libs")
+                .args(deps)
+                .output()
+                .map_err(|_| {
+                    std::io::Error::new(std::io::ErrorKind::NotFound, "pkg-config not found")
+                })?;
+            if !libs.status.success() {
+                return Err(std::io::Error::new(
+                    std::io::ErrorKind::Other,
+                    "pkg-config --libs failed - is the pacakge installed?",
+                ));
+            }
+
+            extra_compile_flags = String::from_utf8_lossy(&cflags.stdout)
+                .split_whitespace()
+                .map(str::to_owned)
+                .collect();
+            extra_link_flags = String::from_utf8_lossy(&libs.stdout)
+                .split_whitespace()
+                .map(str::to_owned)
+                .collect();
+        }
+    }
+
     let source_files: Vec<PathBuf> = glob("src/*.c")
         .map_err(|e| std::io::Error::new(std::io::ErrorKind::NotFound, format!("{e}")))?
         .filter_map(|e| e.ok())
@@ -339,6 +447,7 @@ fn build(mode: &Option<String>, force_recompile: bool) -> std::io::Result<()> {
 
             let status = Command::new(compiler)
                 .args(&build_config.args)
+                .args(&extra_compile_flags)
                 .arg("-c")
                 .arg(src)
                 .arg("-o")
@@ -378,6 +487,7 @@ fn build(mode: &Option<String>, force_recompile: bool) -> std::io::Result<()> {
 
     let status = Command::new(compiler)
         .args(&obj_files)
+        .args(&extra_link_flags)
         .arg("-o")
         .arg(&binary)
         .status()?;

src/config.rs

@@ -14,6 +14,8 @@ pub struct Config {
     pub authors: Option<Vec<String>>,
     /// Build configs
     pub build: Vec<BuildConf>,
+    /// Build dependnecies verified by pkg-config
+    pub dependencies: Option<Vec<String>>,
 }
 
 impl Config {