Generate playground command list from coreutils feat_wasm

Previously the list of WASM-bundled utilities was hardcoded in
wasm-terminal.js and playground.md, which drifted from the actual
feat_wasm feature in coreutils/Cargo.toml (e.g. dd, tty, yes were
missing). The website workflow now parses feat_wasm at build time
and emits static/wasm/commands.js, which the terminal prefers over
its built-in fallback list.

.github/workflows/website.yml

@@ -138,6 +138,14 @@ jobs:
           echo "const WASM_LOCALES = [$(echo "$locales" | sed 's/[^,]*/\"&\"/g')];" \
             > ../uutils.github.io/static/wasm/locales.js
           echo "Available locales: $locales"
+          # Generate the list of available commands from the feat_wasm feature
+          # in Cargo.toml so the playground stays in sync with the WASM build.
+          commands=$(sed -n '/^feat_wasm = \[/,/^\]/p' Cargo.toml \
+            | grep -oE '"[a-zA-Z0-9_]+"' | tr -d '"' \
+            | sort -u | paste -sd, -)
+          echo "const WASM_COMMANDS = [$(echo "$commands" | sed 's/[^,]*/\"&\"/g')];" \
+            > ../uutils.github.io/static/wasm/commands.js
+          echo "Available commands: $commands"
           # Record the coreutils commit used to build the WASM binary
           commit_hash=$(git rev-parse HEAD)
           commit_short=$(git rev-parse --short HEAD)

content/playground.md

@@ -19,6 +19,7 @@ template = "page.html"
 
 <script src="/wasm/locales.js" defer></script>
 <script src="/wasm/version.js" defer></script>
+<script src="/wasm/commands.js" defer></script>
 <script src="/js/wasm-terminal.js" defer></script>
 <script defer>
   document.addEventListener("DOMContentLoaded", function() {
@@ -104,7 +105,7 @@ Multiple commands can be separated by newlines (`%0A` in the URL):
 The following commands run as **real Rust coreutils compiled to WebAssembly**:
 
 `arch` `b2sum` `base32` `base64` `basenc` `basename` `cat` `cksum`
-`comm` `cp` `csplit` `cut` `date` `dir` `dircolors` `dirname`
+`comm` `cp` `csplit` `cut` `date` `dd` `dir` `dircolors` `dirname`
 `echo` `expand` `expr` `factor` `false` `fmt` `fold` `head`
 `join` `link` `ln` `ls` `md5sum` `mkdir` `mv` `nl` `nproc` `numfmt`
 `od` `paste` `pathchk` `printenv` `printf` `pr` `ptx` `pwd`

static/js/wasm-terminal.js

@@ -33,10 +33,13 @@ const SAMPLE_FILES = {
   "words.txt": "hello world\nfoo bar baz\nthe quick brown fox\njumps over the lazy dog\n",
 };
 
-// Commands available in the feat_wasm build
+// Commands available in the feat_wasm build.
-const AVAILABLE_COMMANDS = [
+// The workflow generates /wasm/commands.js from coreutils' Cargo.toml feat_wasm
+// list and exposes it as `WASM_COMMANDS`. The hardcoded list below is a fallback
+// for local dev or when the generated file isn't available.
+const FALLBACK_COMMANDS = [
   "arch", "b2sum", "base32", "base64", "basenc", "basename", "cat", "cksum",
-  "comm", "cp", "csplit", "cut", "date", "dir", "dircolors", "dirname",
+  "comm", "cp", "csplit", "cut", "date", "dd", "dir", "dircolors", "dirname",
   "echo", "expand", "expr", "factor", "false", "fmt", "fold", "head",
   "join", "link", "ln", "ls", "md5sum", "mkdir", "mv", "nl", "numfmt",
   "nproc", "od", "paste", "pathchk", "printenv", "printf", "pr", "ptx", "pwd",
@@ -46,6 +49,10 @@ const AVAILABLE_COMMANDS = [
   "shred", "shuf", "sleep", "sum", "tee", "true", "truncate",
   "uname", "unexpand", "uniq", "unlink", "vdir", "wc",
 ];
+const AVAILABLE_COMMANDS =
+  (typeof WASM_COMMANDS !== "undefined" && Array.isArray(WASM_COMMANDS) && WASM_COMMANDS.length > 0)
+    ? WASM_COMMANDS
+    : FALLBACK_COMMANDS;
 
 // Shortcut mappings for locale command (e.g. "fr" -> "fr-FR")
 const LOCALE_SHORTCUTS = {