Birmingham | 26-SDC-Mar | Chioma Okeke | Sprint 3 | Implement Shell Tools

.gitignore

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

implement-shell-tools/.gitignore

@@ -0,0 +1 @@
+node_modules/

implement-shell-tools/cat/customCat.js

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+#!/usr/bin/env node
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+import process from "node:process";
+
+program
+  .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")
+  .argument("<files...>", "Files to read");
+
+program.parse();
+
+const argv = program.args;
+const options = program.opts();
+
+for (const filePath of argv) {
+  try {
+    const content = await fs.readFile(filePath, "utf-8");
+    const lines = content.split("\n");
+
+    if (lines[lines.length - 1] === "") lines.pop();
+
+    lines.forEach((line, index) => {
+      if (options.nonBlank) {
+        if (line.trim() !== "") {
+          process.stdout.write(
+            `${(index + 1).toString().padStart(6)} ${line}\n`,
+          );
+        } else process.stdout.write(`${line}\n`);
+      } else if (options.number) {
+        process.stdout.write(`${(index + 1).toString().padStart(6)} ${line}\n`);
+      } else {
+        process.stdout.write(`${line}\n`);
+      }
+    });
+  } catch (error) {
+    console.error(`ccat: ${filePath}: No such file or directory.`);
+  }
+}

implement-shell-tools/ls/customLs.js

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+#!/usr/bin/env node
+
+import process from "node:process";
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("cls")
+  .description("List contents of a directory")
+  .option("-1", "Force output to be one entry per line")
+  .option("-a", "Include hidden files")
+  .argument("[path...]", "directories to list");
+
+program.parse();
+
+const options = program.opts();
+const targetPaths = program.args.length > 0 ? program.args : ["."];
+
+async function listDir(dirPath, showHeader) {
+  try {
+    let contents = await fs.readdir(dirPath);
+
+    if (options.a) {
+      contents.push(".", "..");
+    } else {
+      contents = contents.filter((name) => !name.startsWith("."));
+    }
+
+    contents.sort();
+
+    if (showHeader) {
+      process.stdout.write(`${dirPath}:\n`);
+    }
+
+    if (options["1"]) {
+      contents.forEach((item) => process.stdout.write(`${item}\n`));
+    } else {
+      process.stdout.write(`${contents.join("   ")}\n`);
+    }
+  } catch (error) {
+    console.error(`cls: ${dirPath}: ${error.message}`);
+    process.exit(1);
+  }
+}
+
+for (let i = 0; i < targetPaths.length; i++) {
+  const path = targetPaths[i];
+  const isMultiplePath = targetPaths.length > 1;
+
+  await listDir(path, isMultiplePath);
+
+  if (isMultiplePath && i < targetPaths.length - 1) process.stdout.write(`\n`);
+}

implement-shell-tools/package.json

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+{
+  "type": "module",
+  "dependencies": {
+    "commander": "^14.0.3"
+  }
+}

implement-shell-tools/wc/customWc.js

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+#!/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`);
+  }
+})();