wc_implementation

Author: sarawone

implement-shell-tools/wc/package-lock.json

@@ -0,0 +1,7 @@
+{
+    "type": "module",
+    "dependencies": {
+      "commander": "^15.0.0"
+    }
+  }
+  

implement-shell-tools/wc/package.json

@@ -0,0 +1,60 @@
+import process from "node:process";
+import {program} from "commander";
+import {promises as fs} from "node:fs";
+
+program
+.name("WC clone")
+.description("Counting each words in a given file")
+.argument("<files...>","one or more files to count the words")
+.action(async (files)=>{
+    let totalLines = 0;
+    let totalWords = 0;
+    let totalBytes = 0;
+    
+    for (const file of files){
+        try {
+        const content = await fs.readFile(file,"utf-8");
+        const size = await fs.readFile(file);
+
+        const lineCount = content.split("\n").length-1;
+
+        const wordCount = content.trim() === "" ? 0 : content.trim().split(/\s+/).length;
+
+        const byteCount = size.length;
+
+        totalLines += lineCount;
+        totalWords += wordCount;
+        totalBytes += byteCount;
+
+        printCounts({lineCount,wordCount,byteCount,label:file,});
+    }
+
+catch (err){
+    console.error("No such file or directory");
+    process.exit(1);
+}
+    }
+
+    if (files.length>1)
+    {
+        printCounts({lineCount:totalLines,
+            wordCount:totalWords,
+            byteCount:totalBytes,
+            label:"Total",
+        })
+    }
+
+});
+
+function printCounts({lineCount,wordCount,byteCount,label})
+{
+    let output = "";
+
+    output += lineCount.toString().padStart(7, " ");
+    output += wordCount.toString().padStart(7," ");
+    output += byteCount.toString().padStart(7," ");
+
+    console.log(`${output} ${label}`);
+}
+
+program.parse(process.argv);