feat: implement custom wc

Author: JanefrancessC

.gitignore

@@ -1 +1,2 @@
 node_modules
+demo*

implement-shell-tools/cat/customCat.js

@@ -4,7 +4,7 @@ import { promises as fs } from "node:fs";
 import process from "node:process";
 
 program
-  .name("customCat")
+  .name("ccat")
   .description("CLI command to concatenate and print files")
   .option("-n, --number", "Number all output lines starting, at 1")
   .option("-b, --nonBlank", "Number only non-blank lines, starting at 1")
@@ -36,6 +36,6 @@ for (const filePath of argv) {
       }
     });
   } catch (error) {
-    console.error(`customCat: ${filePath}: No such file or directory.`);
+    console.error(`ccat: ${filePath}: No such file or directory.`);
   }
 }

implement-shell-tools/ls/customLs.js

@@ -5,7 +5,7 @@ import { program } from "commander";
 import { promises as fs } from "node:fs";
 
 program
-  .name("customLs")
+  .name("cls")
   .description("List contents of a directory")
   .option("-1", "Force output to be one entry per line")
   .option("-a", "Include hidden files")
@@ -38,7 +38,7 @@ async function listDir(dirPath, showHeader) {
       process.stdout.write(`${contents.join("   ")}\n`);
     }
   } catch (error) {
-    console.error(`customLs: ${dirPath}: ${error.message}`);
+    console.error(`cls: ${dirPath}: ${error.message}`);
     process.exit(1);
   }
 }

implement-shell-tools/wc/customWc.js

@@ -0,0 +1,69 @@
+#!/usr/bin/env node
+
+import { program } from "commander";
+import process from "node:process";
+import { promises as fs } from "node:fs";
+
+program
+  .name("cwc")
+  .description("Displays number of lines, words, and bytes in a file")
+  .option("-l, --lines", "Counts number of newline characters")
+  .option(
+    "-w, --words",
+    "Counts sequence of characters separated by whitespace",
+  )
+  .option("-c, --bytes", "Counts raw size of the files in bytes")
+  .argument("<files...>", "File(s) to read and count");
+
+program.parse();
+
+const options = program.opts();
+const files = program.args;
+
+const noFlags = !options.lines && !options.words && !options.bytes;
+
+let totalLines = 0;
+let totalWords = 0;
+let totalBytes = 0;
+
+async function countFiles(file) {
+  try {
+    const buffer = await fs.readFile(file);
+    const content = buffer.toString("utf-8");
+
+    const lineCount = content === "" ? 0 : content.split("\n").length - 1;
+    const wordCount = content.trim() ? content.trim().split(/\s+/).length : 0;
+    const byteCount = buffer.length;
+
+    totalLines += lineCount;
+    totalWords += wordCount;
+    totalBytes += byteCount;
+
+    let result = "";
+
+    if (options.lines || noFlags) result += `${String(lineCount).padStart(8)}`;
+    if (options.words || noFlags) result += `${String(wordCount).padStart(8)}`;
+    if (options.bytes || noFlags) result += `${String(byteCount).padStart(8)}`;
+
+    process.stdout.write(`${result} ${file}\n`);
+  } catch (error) {
+    console.error(`cwc: ${file}: ${error.message}`);
+    process.exit(1);
+  }
+}
+
+(async () => {
+  for (const file of files) {
+    await countFiles(file);
+  }
+
+  if (files.length > 1) {
+    let total = "";
+
+    if (options.lines || noFlags) total += `${String(totalLines).padStart(8)}`;
+    if (options.words || noFlags) total += `${String(totalWords).padStart(8)}`;
+    if (options.bytes || noFlags) total += `${String(totalBytes).padStart(8)}`;
+
+    process.stdout.write(`${total} total\n`);
+  }
+})();