filed: auto install npm dependencies

filed/build.rs

@@ -1,5 +1,5 @@
 
-use std::{fs, path::PathBuf, ffi::OsStr, process::Command, error::Error};
+use std::{error::Error, ffi::OsStr, fs, path::PathBuf, process::{self, Command}};
 
 use css_minify::optimizations::{Minifier, Level};
 
@@ -36,8 +36,44 @@ fn system(cmd: &str, args: &[&str]) -> Result<String, Box<dyn Error>> {
     Ok(String::from_utf8(out.stdout)?)
 }
 
+fn check_cmd<T: AsRef<OsStr>>(cmd: T) -> bool {
+    Command::new(cmd)
+        .spawn()
+        .is_ok()
+}
+
 fn main() {
 
+    let html_exists = check_cmd("html-minifier");
+    let ugjs_exists = check_cmd("uglify-js");
+
+    if ! (html_exists || ugjs_exists) {
+        eprintln!("html-minifier or uglify-js are not installed! Trying to install them via npm...");
+        if ! check_cmd("npm") {
+            eprintln!("npm is not installed! Please install npm and/or html-minifier and uglify-js and build again");
+            process::exit(1)
+        }
+
+        let mut cmd = Command::new("npm");
+        cmd.arg("install")
+            .arg("--global");
+
+        if ! html_exists {
+            cmd.arg("html-minifier");
+        }
+        if ! ugjs_exists {
+            cmd.arg("uglify-js");
+        }
+
+        let res = cmd.spawn().unwrap().wait().unwrap();
+        if res.success() {
+            eprintln!("Successfully installed html-minifier and/or uglify-js");
+        } else {
+            eprintln!("Couldn't install html-minifier and/or uglify-js! Check the log above for details.");
+            process::exit(1)
+        }
+    }
+
     println!("cargo:rerun-if-changed=static/assets");
     println!("cargo:rerun-if-changed=templates/source");