Glasgow | 26-JUL-SDC | Shreef Ibrahim| Sprint 3 | Implement- shell- tools

implement-shell-tools/cat/cat.js

@@ -0,0 +1,46 @@
+const fs = require("fs");
+
+const args = process.argv.slice(2);
+
+let flag = "";
+let lineNumber = 1;
+
+for (const arg of args) {
+
+    // Check for flags
+    if (arg === "-n" || arg === "-b") {
+        flag = arg;
+        continue;
+    }
+  let lineNumber = 1;
+    // Read the file
+    const content = fs.readFileSync(arg, "utf8");
+
+    // split into lines
+    const lines = content.split("\n");
+
+    // Remove the extra empty line if the file ends with a new line
+    if (lines[lines.length - 1] === "") {
+        lines.pop();
+    }
+
+
+    for (const line of lines) {
+
+     if (flag === "-n") {
+    console.log(`${String(lineNumber).padStart(6)}  ${line}`);;
+    lineNumber++;
+} else if (flag === "-b") {
+    if (line === "") {
+        console.log("");
+    } else {
+        console.log(`${String(lineNumber).padStart(6)}  ${line}`);;
+        lineNumber++;
+    }
+}
+
+        else {
+            console.log(line);
+        }
+    }
+}

implement-shell-tools/ls/ls.js

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+const fs = require("fs");
+const path = require("path");
+const args = process.argv.slice(2);
+
+let onePerLine = false;
+let showAll = false;
+let target = ".";
+
+for (const arg of args) {
+
+    if (arg === "-1") {
+        onePerLine = true;
+    }
+    else if (arg === "-a") {
+        showAll = true;
+    }
+    else {
+        target = arg;
+    }
+}
+
+const stats = fs.statSync(target);
+if (stats.isFile()) {
+    console.log(target);
+} else {
+
+    let files = fs.readdirSync(target);
+
+if (showAll) {
+    files = [".", "..", ...files];
+} else {
+    files = files.filter(file => !file.startsWith("."));
+}
+
+if (onePerLine) {
+    for (const file of files) {
+        console.log(file);
+    }
+} else {
+    console.log(files.join("   "));
+}
+}

implement-shell-tools/wc/wc.js

@@ -0,0 +1,69 @@
+const fs = require("fs");
+
+const args = process.argv.slice(2);
+
+let showWords = false;
+let showChars = false;
+let showLines = false;
+let fileNames = [];
+
+// Check flags and file names
+for (const item of args) {
+    if (item === "-l") {
+        showLines = true;
+    } else if (item === "-w") {
+        showWords = true;
+    } else if (item === "-c") {
+        showChars = true;
+    } else {
+        fileNames.push(item);
+    }
+}
+
+// If no flags are given, show everything
+if (!showLines && !showWords && !showChars) {
+    showLines = true;
+    showWords = true;
+    showChars = true;
+}
+
+let grandLines = 0;
+let grandWords = 0;
+let grandChars = 0;
+
+for (const fileName of fileNames) {
+    const text = fs.readFileSync(fileName, "utf8");
+
+    const totalLines = text.split("\n").length - 1;
+
+    const trimmed = text.trim();
+    const totalWords = trimmed ? trimmed.split(/\s+/).length : 0;
+
+    const totalChars = Buffer.byteLength(text);
+
+    grandLines += totalLines;
+    grandWords += totalWords;
+    grandChars += totalChars;
+
+    let output = "";
+
+    if (showLines) output += String(totalLines).padStart(8);
+    if (showWords) output += String(totalWords).padStart(8);
+    if (showChars) output += String(totalChars).padStart(8);
+
+    output += " " + fileName;
+
+    console.log(output);
+}
+
+if (fileNames.length > 1) {
+    let output = "";
+
+    if (showLines) output += String(grandLines).padStart(8);
+    if (showWords) output += String(grandWords).padStart(8);
+    if (showChars) output += String(grandChars).padStart(8);
+
+    output += " total";
+
+    console.log(output);
+}