add small frontend stack w/ tailwind & askama

build.rs

@@ -0,0 +1,92 @@
+use std::env;
+use std::fs;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed=web");
+
+    let os = env::var("CARGO_CFG_TARGET_OS").unwrap_or_else(|_| String::from("unknown"));
+    let arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_else(|_| String::from("unknown"));
+    let download_url = match (os.as_str(), arch.as_str()) {
+        ("macos", "aarch64") => {
+            "https://github.com/tailwindlabs/tailwindcss/releases/latest/download/tailwindcss-macos-arm64"
+        }
+        ("linux", "x86_64") => {
+            "https://github.com/tailwindlabs/tailwindcss/releases/latest/download/tailwindcss-linux-x64"
+        }
+        ("linux", "aarch64") => {
+            "https://github.com/tailwindlabs/tailwindcss/releases/latest/download/tailwindcss-linux-arm64"
+        }
+        _ => return Err(format!("Unsupported platform: {} {}", os, arch).into()),
+    };
+
+    let out_dir = PathBuf::from(env::var("OUT_DIR")?);
+    let tailwind_binary = out_dir.join("tailwind");
+    fs::create_dir_all(&out_dir)?;
+
+    download_tailwind(&download_url, &tailwind_binary)?;
+
+    println!("cargo:rustc-env=TAILWIND_BIN={}", tailwind_binary.display());
+
+    run_tailwind(&tailwind_binary)?;
+    Ok(())
+}
+
+fn run_tailwind(bin: &PathBuf) -> Result<(), Box<dyn std::error::Error>> {
+    println!("Building CSS with Tailwind...");
+
+    let basedir = std::env::var("CARGO_MANIFEST_DIR").unwrap_or_else(|_| ".".into());
+    let input = Path::new(&basedir).join("web").join("input.css");
+    let inputstr = input.to_str().unwrap();
+    let output = Path::new(&basedir).join("web").join("styles.css");
+    let outputstr = output.to_str().unwrap();
+    let args = vec!["-i", inputstr, "-o", outputstr, "--minify"];
+
+    let run = Command::new(&bin).args(args).status()?;
+    match run.success() {
+        true => println!("Tailwind CSS build complete."),
+        false => println!("Tailwind CSS build failed."),
+    };
+    Ok(())
+}
+
+fn download_tailwind(url: &str, target_path: &Path) -> Result<(), Box<dyn std::error::Error>> {
+    if target_path.exists() {
+        return Ok(()); // if present, assume the file is the appropriate tailwind binary
+    }
+
+    let tmp_download = target_path.with_extension("tmp");
+    let download_status = if Command::new("curl").arg("--version").output().is_ok() {
+        Command::new("curl")
+            .arg("-L") // Follow redirects
+            .arg("-o")
+            .arg(&tmp_download)
+            .arg(url)
+            .status()?
+    } else if Command::new("wget").arg("--version").output().is_ok() {
+        Command::new("wget")
+            .arg("-O")
+            .arg(&tmp_download)
+            .arg(url)
+            .status()?
+    } else {
+        return Err("Neither curl nor wget is available".into());
+    };
+
+    if !download_status.success() {
+        return Err(format!("Tailwind binary download failed: {}", download_status).into());
+    }
+    fs::rename(&tmp_download, target_path)?;
+
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        let mut perms = fs::metadata(target_path)?.permissions();
+        perms.set_mode(0o777);
+        fs::set_permissions(target_path, perms)?;
+    }
+
+    Ok(())
+}