NW | 26-SDC-Mar | TzeMing Ho | Sprint 3 | Implement shell tools exercises

implement-shell-tools/cat/customCat.js

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+import { program } from "commander";
+import { promises as fs } from "node:fs";
+import process from "node:process";
+
+program
+  .name("custom-cat")
+  .description("my-own-version-of-cat")
+  .option("-n, --line", "Adding a number before each roll")
+  .option(
+    "-b, --nonBlank",
+    "Only adding a number before roll that is non blank",
+  )
+  .argument("<path...>", "The file path to process");
+
+program.parse();
+
+const options = program.opts();
+
+const argumentArray = program.args;
+if (argumentArray.length < 1) {
+  console.log(
+    `We need at least 1 path of file to process but we got ${argumentArray.length}`,
+  );
+  process.exit(1);
+}
+
+const pathsArray = argumentArray;
+
+let count = 1;
+
+for (let path of pathsArray) {
+  try {
+    const context = await fs.readFile(path, "utf-8");
+    const lines = context.trimEnd().split("\n");
+    if (options.nonBlank) {
+      lines.forEach((line) => {
+        if (line.trim().length != 0) {
+          console.log(`     ${count}  ${line}`);
+          count++;
+        } else {
+          console.log(line);
+        }
+      });
+    } else if (options.line) {
+      lines.forEach((line) => {
+        console.log(`     ${count}  ${line}`);
+        count++;
+      });
+    } else {
+      console.log(context.trimEnd());
+    }
+  } catch (error) {
+    console.error(error.message);
+    process.exitCode = 1;
+  }
+}

implement-shell-tools/ls/customLs.js

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+import { program } from "commander";
+import { promises as fs } from "node:fs";
+import process from "node:process";
+
+program
+  .name("Custom-ls")
+  .description("Custom-ls-that-works-like-ls")
+  .option("-1, --oneFile", "Showing one file per line")
+  .option("-a, --showHidden", "Showing hidden files")
+  .argument("[path]", "The file path to process");
+
+program.parse();
+
+const argumentsArray = program.args;
+
+const path = argumentsArray[0] || "./";
+
+async function formatFileName(base, fileName) {
+  try {
+    const fullPath = `${base.endsWith("/") ? base : base + "/"}${fileName}`;
+    const stats = await fs.stat(fullPath);
+    if (stats.isDirectory() && process.stdout.isTTY) {
+      return `\x1b[1;34m${fileName}\x1b[0m`;
+    }
+    return fileName;
+  } catch (error) {
+    return fileName;
+  }
+}
+
+try {
+  const files = await fs.readdir(path);
+
+  const sortedFiles = files.sort((a, b) => {
+    const cleanA = a.replace(/^\./, "");
+    const cleanB = b.replace(/^\./, "");
+    return cleanA.localeCompare(cleanB, undefined, { sensitivity: "base" });
+  });
+
+  const options = program.opts();
+
+  let renderingFiles = [];
+
+  if (options.showHidden) {
+    renderingFiles = [".", "..", ...sortedFiles];
+  } else {
+    renderingFiles = sortedFiles.filter((file) => !/^\./.test(file));
+  }
+
+  if (options.oneFile) {
+    for (let file of renderingFiles) {
+      console.log(await formatFileName(path, file));
+    }
+  } else {
+    const formatted = await Promise.all(
+      renderingFiles.map((fileName) => {
+        return formatFileName(path, fileName);
+      }),
+    );
+    console.log(formatted.join(" "));
+  }
+} catch (error) {
+  const stats = await fs.stat(path).catch(() => null);
+  if (stats && stats.isFile()) {
+    console.log(path);
+  } else {
+    console.error(
+      `Can't access to this path: ${path} - No such file or directory`,
+    );
+    process.exit(1);
+  }
+}

implement-shell-tools/package.json

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

implement-shell-tools/wc/customWc.js

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+import { program } from "commander";
+import { promises as fs } from "node:fs";
+import process from "node:process";
+
+program
+  .name("Custom-wc")
+  .description("Custom-wc-that-works-like-wc")
+  .option("-l, --lines", "Counting lines in the file")
+  .option("-w, --words", "Counting words in the file")
+  .option("-c, --characters", "Counting characters in the file")
+  .argument("<path...>", "Path of file to process");
+
+program.parse();
+
+const argumentArray = program.args;
+if (argumentArray.length === 0) {
+  console.log(`We need at least one file path to process`);
+  process.exit(1);
+}
+
+const pathArray = argumentArray;
+const options = program.opts();
+
+function padStartNumbers(...args) {
+  const space = 8;
+  const numberStringArray = [];
+  for (let index = 0; index < args.length; index++) {
+    numberStringArray.push(String(args[index]).padStart(space, " "));
+  }
+  return numberStringArray.join("");
+}
+
+const totalRowNumbers = [];
+
+let totalOfLines = 0;
+let totalOfWords = 0;
+let totalOfCharacters = 0;
+
+for (let path of pathArray) {
+  let numberOfLines = 0;
+  let numberOfWords = 0;
+  let numberOfCharacters = 0;
+
+  try {
+    const file = await fs.readFile(path, "utf-8");
+    numberOfLines = file.split("\n").length - 1;
+    const words = file.match(/\S+/g);
+    numberOfWords = words ? words.length : 0;
+    numberOfCharacters = file.length;
+
+    const rowNumbers = [];
+
+    if (options.lines) rowNumbers.push(numberOfLines);
+    if (options.words) rowNumbers.push(numberOfWords);
+    if (options.characters) rowNumbers.push(numberOfCharacters);
+
+    if (rowNumbers.length === 0) {
+      console.log(
+        `${padStartNumbers(numberOfLines, numberOfWords, numberOfCharacters)} ${path}`,
+      );
+    } else {
+      if (pathArray.length === 1 && rowNumbers.length === 1) {
+        console.log(`${rowNumbers[0]} ${path}`);
+      } else {
+        console.log(`${padStartNumbers(...rowNumbers)} ${path}`);
+      }
+    }
+    totalOfLines += numberOfLines;
+    totalOfWords += numberOfWords;
+    totalOfCharacters += numberOfCharacters;
+  } catch (error) {
+    console.error(error.message);
+    process.exitCode = 1;
+  }
+}
+
+if (pathArray.length > 1) {
+  if (options.lines) totalRowNumbers.push(totalOfLines);
+  if (options.words) totalRowNumbers.push(totalOfWords);
+  if (options.characters) totalRowNumbers.push(totalOfCharacters);
+  if (totalRowNumbers.length > 0) {
+    console.log(`${padStartNumbers(...totalRowNumbers)} total`);
+  } else {
+    console.log(
+      `${padStartNumbers(totalOfLines, totalOfWords, totalOfCharacters)} total`,
+    );
+  }
+}