Install dev aware stubs

Author: mxcl

pkgm.ts

@@ -178,10 +178,13 @@ async function install(args: string[], basePath: string) {
         for (const [key, value] of Object.entries(env)) {
           sh += `export ${key}="${value}"\n`;
         }
-        sh += `exec "${bin_prefix}/${entry.name}" "$@"\n`;
+
+        sh += "\n";
+        //TODO should be specific with the project
+        sh += dev_stub_text(to_stub, bin_prefix, entry.name);
 
         await Deno.remove(to_stub); //FIXME inefficient to symlink for no reason
-        await Deno.writeTextFile(to_stub, sh);
+        await Deno.writeTextFile(to_stub, sh.trim() + "\n");
         await Deno.chmod(to_stub, 0o755);
 
         rv.push(to_stub);
@@ -726,3 +729,25 @@ function install_prefix() {
     return Path.home().join(".local");
   }
 }
+
+function dev_stub_text(selfpath: string, bin_prefix: string, name: string) {
+  const datadir = "$HOME/Library/Application Support";
+  return `
+dev_check() {
+  [ -x /usr/local/bin/dev ] || return 1
+  local d="$PWD"
+  until [ "$d" = / ]; do
+    [ -f "${datadir}/pkgx/dev/$d/dev.pkgx.activated" ] && return 0
+    d="$(dirname "$d")"
+  done
+  return 1
+}
+
+if dev_check; then
+  eval "$(/usr/local/bin/dev --quiet)"
+  [ "$(command -v ${name} 2>/dev/null)" != "${selfpath}" ] && exec ${name} "$@"
+fi
+
+exec ${bin_prefix}/${name} "$@"
+`.trim();
+}