fix: handle per-file errors and empty file word count

Continue processing remaining files after an error.
Set the process exit code to 1 if any file fails.
Count zero words for empty files.

Author: AhmadHmedann

implement-shell-tools/wc/wc.mjs

@@ -20,13 +20,15 @@ const total = {
   wordsCounter: 0,
   characterCounter: 0,
 };
-
-try {
-  for (const path of paths) {
+let hadError = false;
+for (const path of paths) {
+  try {
     const content = await fs.readFile(path, "utf-8");
 
     const linesCounter = content.split("\n").length - 1;
-    const wordsCounter = content.trim().split(/\s+/).length;
+    const trimmedContent = content.trim();
+    const wordsCounter =
+      trimmedContent === "" ? 0 : trimmedContent.split(/\s+/).length;
     const characterCounter = content.length;
 
     total.linesCounter += linesCounter;
@@ -45,20 +47,24 @@ try {
     else {
       console.log(results.join(" ") + " " + path);
     }
+  } catch (error) {
+    console.error(error.message);
+    hadError = true;
   }
-  if (paths.length > 1) {
-    if (!options.l && !options.w && !options.c) {
-      console.log(
-        ` ${total.linesCounter}  ${total.wordsCounter} ${total.characterCounter} total`,
-      );
-    } else {
-      const totalWithFlags = [];
-      if (options.l) totalWithFlags.push(total.linesCounter);
-      if (options.w) totalWithFlags.push(total.wordsCounter);
-      if (options.c) totalWithFlags.push(total.characterCounter);
-      console.log(totalWithFlags.join(" ") + " total");
-    }
+}
+if (paths.length > 1) {
+  if (!options.l && !options.w && !options.c) {
+    console.log(
+      ` ${total.linesCounter}  ${total.wordsCounter} ${total.characterCounter} total`,
+    );
+  } else {
+    const totalWithFlags = [];
+    if (options.l) totalWithFlags.push(total.linesCounter);
+    if (options.w) totalWithFlags.push(total.wordsCounter);
+    if (options.c) totalWithFlags.push(total.characterCounter);
+    console.log(totalWithFlags.join(" ") + " total");
   }
-} catch (error) {
-  console.error(error.message);
+}
+if (hadError) {
+  process.exitCode = 1;
 }