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

implement-shell-tools/cat/cat.js

@@ -0,0 +1,50 @@
+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;
+    }
+
+    // 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(`${lineNumber}\t${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(path.basename(target));
+} else {
+
+    let files = fs.readdirSync(target);
+
+    if (!showAll) {
+        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 +1,46 @@
+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 (let 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;
+}
+
+for (let fileName of fileNames) {
+    let text = fs.readFileSync(fileName, "utf8");
+
+    let totalLines = text.split("\n").length - 1;
+    let totalWords = text.trim().split(/\s+/).length;
+    let totalChars = Buffer.byteLength(text);
+
+    let output = "";
+
+    if (showLines) output += totalLines + " ";
+    if (showWords) output += totalWords + " ";
+    if (showChars) output += totalChars + " ";
+
+    output += fileName;
+
+    console.log(output);
+}