Format

Author: Craig D'Silva

implement-shell-tools/cat/cat.js

@@ -4,23 +4,35 @@ import { promises as fs } from "node:fs";
 
 let showNumber = false;
 
-program.name("cat").description("Prints the output of a file to the console").option("-n, --number", "Displays the lines along with their number").argument("<path>", "The file path").allowExcessArguments()
-program.parse()
+program
+  .name("cat")
+  .description("Prints the output of a file to the console")
+  .option("-n, --number", "Displays the lines along with their number")
+  .argument("<path>", "The file path")
+  .allowExcessArguments();
+program.parse();
 
-const argv = program.args
+const argv = program.args;
 if (argv.length < 1) {
-    console.error(`Expected exactly 1 or more arguments (paths) to be passed but got ${argv.length}.`);
-    process.exit(1);
+  console.error(
+    `Expected exactly 1 or more arguments (paths) to be passed but got ${argv.length}.`,
+  );
+  process.exit(1);
 }
 
-showNumber = program.opts().number
+showNumber = program.opts().number;
 
 const stringArr = [];
 for (const path of argv) {
-    stringArr.push(await fs.readFile(path, "utf-8"));
+  stringArr.push(await fs.readFile(path, "utf-8"));
 }
 
-const flatArr = stringArr.flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l !== ""));
+const flatArr = stringArr.flatMap((l) =>
+  l
+    .split("\n")
+    .map((l, i, a) => (i < a.length - 1 ? l + "\n" : l))
+    .filter((l) => l !== ""),
+);
 
-if (!showNumber) console.log(flatArr.join(""))
-else console.log(flatArr.map((l, i) => `${i + 1} ${l}`).join(""))
+if (!showNumber) console.log(flatArr.join(""));
+else console.log(flatArr.map((l, i) => `${i + 1} ${l}`).join(""));

implement-shell-tools/ls/ls.js

@@ -1,11 +1,16 @@
 import { program } from "commander";
-import process from 'node:process';
-import fs from 'node:fs';
+import process from "node:process";
+import fs from "node:fs";
 
 let vertical = false;
 let showHidden = false;
 
-program.name("list-directory-contents").description("Shows all files and folders in a directory").option("-1", "List one file/directory per line").option("-a, --all", "Show hidden files").argument("[path]", "Path of the directory to list (defaults to .)")
+program
+  .name("list-directory-contents")
+  .description("Shows all files and folders in a directory")
+  .option("-1", "List one file/directory per line")
+  .option("-a, --all", "Show hidden files")
+  .argument("[path]", "Path of the directory to list (defaults to .)");
 
 program.parse();
 
@@ -18,14 +23,14 @@ const folderPath = argv[0] || ".";
 
 const contents = fs.readdirSync(folderPath);
 
-const filtered = contents.filter(f => f[0] !== ".")
+const filtered = contents.filter((f) => f[0] !== ".");
 
-const dirArr = !showHidden ? filtered : contents
+const dirArr = !showHidden ? filtered : contents;
 
 if (!vertical) {
-    console.log(dirArr.join("  "));
+  console.log(dirArr.join("  "));
 } else {
-    for (const content of dirArr) {
-        console.log(content);
-    }
-}
+  for (const content of dirArr) {
+    console.log(content);
+  }
+}

implement-shell-tools/wc/wc.js

@@ -6,24 +6,29 @@ let showLineCount = true;
 let showWordCount = true;
 let showByteCount = true;
 
-program.name("wc").description("Print the number of lines, word and bytes for each file and a total if there are multiple files")
-.option("-l, --lines", "Print the number of lines")
-.option("-w, --words", "Print the number of words")
-.option("-c, --bytes", "Print the number of bytes")
-.argument("<path>", "The file path").allowExcessArguments()
-program.parse()
+program
+  .name("wc")
+  .description(
+    "Print the number of lines, word and bytes for each file and a total if there are multiple files",
+  )
+  .option("-l, --lines", "Print the number of lines")
+  .option("-w, --words", "Print the number of words")
+  .option("-c, --bytes", "Print the number of bytes")
+  .argument("<path>", "The file path")
+  .allowExcessArguments();
+program.parse();
 
 const argv = program.args;
 
 if (Object.keys(program.opts()).length >= 1) {
-    showLineCount = program.opts().lines;
-    showWordCount = program.opts().words;
-    showByteCount = program.opts().bytes;
+  showLineCount = program.opts().lines;
+  showWordCount = program.opts().words;
+  showByteCount = program.opts().bytes;
 }
 
 const stringArr = [];
 for (const path of argv) {
-    stringArr.push(await fs.readFile(path, "utf-8"));
+  stringArr.push(await fs.readFile(path, "utf-8"));
 }
 
 let lines = 0;
@@ -32,31 +37,36 @@ let bytes = 0;
 
 const infoArr = [];
 for (let i = 0; i < stringArr.length; i++) {
-    const arr = [];
-    const line = stringArr[i].split("\n").length
-    const wc = stringArr[i].split(" ").flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l.trim() !== "")).length
-    const lineByte = new Blob([stringArr[i]]).size
-    if (showLineCount) {
-    arr.push(line - 1)
+  const arr = [];
+  const line = stringArr[i].split("\n").length;
+  const wc = stringArr[i].split(" ").flatMap((l) =>
+    l
+      .split("\n")
+      .map((l, i, a) => (i < a.length - 1 ? l + "\n" : l))
+      .filter((l) => l.trim() !== ""),
+  ).length;
+  const lineByte = new Blob([stringArr[i]]).size;
+  if (showLineCount) {
+    arr.push(line - 1);
     lines += line - 1;
-    }
-    if (showWordCount) {
+  }
+  if (showWordCount) {
     arr.push(wc);
     words += wc;
-    }
-    if (showByteCount) {
-    arr.push(lineByte)
-    bytes += lineByte
-    }
-    arr.push(argv[i])
-    infoArr.push(arr.join(" "))
+  }
+  if (showByteCount) {
+    arr.push(lineByte);
+    bytes += lineByte;
+  }
+  arr.push(argv[i]);
+  infoArr.push(arr.join(" "));
 }
 
 if (infoArr.length > 1) {
-    const totalArr = ["total"];
-    if (showByteCount) totalArr.unshift(bytes);
-    if (showWordCount) totalArr.unshift(words);
-    if (showLineCount) totalArr.unshift(lines);
-    infoArr.push(totalArr.join(" "))
+  const totalArr = ["total"];
+  if (showByteCount) totalArr.unshift(bytes);
+  if (showWordCount) totalArr.unshift(words);
+  if (showLineCount) totalArr.unshift(lines);
+  infoArr.push(totalArr.join(" "));
 }
-console.log(infoArr.join("\n"))
+console.log(infoArr.join("\n"));