Cape Town| 25-SDC-July | Faith Muzondo | Sprint 3| Implement shell tools

implement-shell-tools/cat/cat.mjs

@@ -0,0 +1,47 @@
+import { program } from "commander";
+import{promises as fs} from "node:fs";
+
+
+program
+.name("cat")
+.description("displays the contents of a file")
+.option("-n, --number", "Number all output lines")
+.option("-b, --number-nonblank", "Number non-blank output lines only")
+.argument("<filepaths...>");
+
+program.parse();
+
+
+const args = program.args;
+const opts = program.opts();
+
+if (args.length === 0) {
+  console.error("Error: Missing <filepath> argument.");
+  program.help();
+}
+
+let globalLineNumber = 1;
+
+for (const path of args) {
+  try {
+    const content = await fs.readFile(path, "utf-8");
+    const lines = content.split('\n');
+
+    if (opts.number) {
+      lines.forEach((line, idx) => {
+        console.log(`${idx + 1}\t${line}`);
+      });
+    } else if (opts.numberNonblank) {
+      for (const line of lines) {
+        if (line.trim() !== '') {
+          console.log(`${globalLineNumber}\t${line}`);
+          globalLineNumber++;
+        }
+      }
+    } else {
+      console.log(content);
+    }
+  } catch (err) {
+    console.error(`Error reading file "${path}": ${err.message}`);
+  }
+}

implement-shell-tools/ls/ls.mjs

@@ -0,0 +1,33 @@
+import {program} from "commander";
+import {promises as fs} from "node:fs";
+
+program
+.name("ls")
+.description("displays files in a directory")
+.option("-1, --one", "displays each file in its own line")
+.option("-a, --all", "displays all files including hidden files")
+.arguments("<filepath>")
+
+await program.parseAsync();
+
+const opts = program.opts();
+const args = program.args;
+
+if (args.length === 0) {
+  console.error("Error: Missing <filepath> argument.");
+  program.help();
+}
+
+const path = args[0];
+const files = await fs.readdir(path);
+
+let visibleFiles = files;
+if (!opts.all) {
+  visibleFiles = files.filter(file => !file.startsWith("."));
+}
+
+if (opts.one) {
+  visibleFiles.forEach(console.log);
+} else {
+  console.log(visibleFiles.join(" "));
+}

implement-shell-tools/wc/wc.mjs

@@ -0,0 +1,72 @@
+import {program} from "commander";
+import{promises as fs} from "node:fs";
+
+program
+.name("wc")
+.description("counts lines, words, and bytes")
+.option("-l, --line", "counts number of lines in the file")
+.option("-w, --words", "counts number of words in the file")
+.option("-c, --bytes", "counts number  of bytes in the file")
+.argument("<filepaths...>")
+
+program.parse();
+
+const args= program.args;
+const opts = program.opts();
+
+if(args.length === 0){
+    console.error("Error: Missing <filepath> argument.");
+  program.help();
+}
+
+const countLines = content => content.split(/\r?\n/).length;
+const countWords = content => content.trim().split(/\s+/).filter(Boolean).length;
+const countBytes = content => Buffer.byteLength(content, "utf-8");
+
+// store totals for multiple files
+let totalLines = 0;
+let totalWords = 0;
+let totalBytes = 0;
+
+for (const path of args) {
+  try {
+    const content = await fs.readFile(path, "utf-8");
+
+    const lines = countLines(content);
+    const words = countWords(content);
+    const bytes = countBytes(content);
+
+    totalLines += lines;
+    totalWords += words;
+    totalBytes += bytes;
+
+    // collect counts based on options
+    const output = [];
+    if (opts.line) output.push(lines);
+    if (opts.words) output.push(words);
+    if (opts.bytes) output.push(bytes);
+
+    // if no options are passed, print all
+    if (!opts.line && !opts.words && !opts.bytes) {
+      output.push(lines, words, bytes);
+    }
+
+    console.log(...output, path);
+  } catch (err) {
+    console.error(`Error reading file "${path}": ${err.message}`);
+  }
+}
+
+// print totals if more than one file
+if (args.length > 1) {
+  const totalOutput = [];
+  if (opts.line) totalOutput.push(totalLines);
+  if (opts.words) totalOutput.push(totalWords);
+  if (opts.bytes) totalOutput.push(totalBytes);
+
+  if (!opts.line && !opts.words && !opts.bytes) {
+    totalOutput.push(totalLines, totalWords, totalBytes);
+  }
+
+  console.log(...totalOutput, "total");
+}

individual-shell-tools/ls/script-01.sh

@@ -13,3 +13,4 @@ fi
 
 # TODO: Write a command to list the files and folders in this directory.
 # The output should be a list of names including child-directory, script-01.sh, script-02.sh, and more.
+ls 

individual-shell-tools/ls/script-02.sh

@@ -4,3 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command which lists all of the files in the directory named child-directory.
 # The output should be a list of names: helper-1.txt, helper-2.txt, helper-3.txt.
+ls chile