feat: add __lang/rusty_jsc/, build_readme.rs

build_readme_rs/src/main.rs

@@ -0,0 +1,38 @@
+#!/usr/bin/env runrs
+//! ```cargo
+//! [dependencies]
+//! rust_util = { version = "0.6" }
+//! ```
+
+use std::fs;
+
+use rust_util::{failure_and_exit, opt_result, util_cmd, XResult};
+
+fn main() -> XResult<()> {
+    let readme_template_file = "README_template.md";
+    let readme_template = opt_result!(fs::read_to_string(readme_template_file),
+        "Read {} failed: {}", readme_template_file);
+
+    let output = util_cmd::run_command_or_exit("tree", &["-L", "2"]);
+    if !output.status.success() {
+        failure_and_exit!("Run tree -L 2 failed: {}", output.status);
+    }
+    let tree_output = String::from_utf8_lossy(&output.stdout).to_string();
+    let tree_output_lines = tree_output.lines();
+    let mut tree_lines = vec![];
+    let ignored_file_list = vec![
+        "LICENSE", "README.md", "README_template.md",
+        "build_readme.js", "build_readme_rs",
+    ];
+    for ln in tree_output_lines {
+        let ignored = ignored_file_list.iter().any(|f| ln.ends_with(f));
+        if !ignored {
+            tree_lines.push(ln);
+        }
+    }
+    let joined_tree_lines = tree_lines.join("\n");
+
+    let readme = readme_template.replace("$$TREE_L2$$", &joined_tree_lines);
+    opt_result!(fs::write("README.md", readme), "Write README.md failed: {}");
+    Ok(())
+}