London | 6-SDC-Aug | Boshra Mahmoudi | Sprint 3 | Implement shell tools

implement-shell-tools/cat/cat.js

@@ -0,0 +1,48 @@
+import { readFile } from "node:fs/promises";
+import process from "node:process";
+
+const argv = process.argv.slice(2);
+
+let showLineNumbers = false;
+let numberNonBlankLines = false;
+const files = [];
+
+for (const arg of argv) {
+  if (arg === "-n") {
+    showLineNumbers = true;
+  } else if (arg === "-b") {
+    numberNonBlankLines = true;
+  } else {
+    files.push(arg);
+  }
+}
+
+let lineNumber = 1;
+
+for (const file of files) {
+  try {
+    const content = await readFile(file, "utf-8");
+
+    const lines = content.split("\n");
+
+    if (numberNonBlankLines) {
+      for (const line of lines) {
+        if (line !== "") {
+          console.log(`${lineNumber} ${line}`);
+          lineNumber++;
+        } else {
+          console.log("");
+        }
+      }
+    } else if (showLineNumbers) {
+      for (const line of lines) {
+        console.log(`${lineNumber} ${line}`);
+        lineNumber++;
+      }
+    } else {
+      process.stdout.write(content);
+    }
+  } catch (err) {
+    console.error(err.message);
+  }
+}

implement-shell-tools/ls/ls.js

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+import { readdir, stat } from "node:fs/promises";
+import process from "node:process";
+
+const argv = process.argv.slice(2);
+
+let onePerLine = false;
+let showAll = false;
+const paths = [];
+
+for (const arg of argv) {
+  if (arg === "-1") {
+    onePerLine = true;
+  } else if (arg === "-a") {
+    showAll = true;
+  } else {
+    paths.push(arg);
+  }
+}
+
+if (paths.length === 0) {
+  paths.push(".");
+}
+
+for (const path of paths) {
+  try {
+    const info = await stat(path);
+
+    if (info.isDirectory()) {
+      let files = await readdir(path);
+
+      if (!showAll) {
+        files = files.filter((file) => !file.startsWith("."));
+      }
+
+      if (onePerLine) {
+        for (const file of files) {
+          console.log(file);
+        }
+      } else {
+        for (const file of files) {
+          process.stdout.write(`${file}  `);
+        }
+        process.stdout.write("\n");
+      }
+    } else {
+      console.log(path);
+    }
+  } catch (err) {
+    console.error(err.message);
+  }
+}

implement-shell-tools/wc/wc.js

@@ -0,0 +1,78 @@
+import { readFile } from "node:fs/promises";
+import process from "node:process";
+
+const argvs= process.argv.slice(2);
+let countLines = false;
+let countWords = false;
+let countBytes = false;
+let totalWords = 0;
+let totalLines = 0;
+let totalBytes = 0;
+const files = []
+
+for (const arg of argvs) {
+  if (arg === "-l") {
+    countLines = true;
+  } else if (arg === "-w") {
+    countWords = true;
+  } else if (arg === "-c") {
+    countBytes = true;
+  } else {
+    files.push(arg);
+  }
+}
+
+for (const file of files) {
+  try {
+    const content = await readFile(file, "utf-8");
+    const arrayOfLines = content.split("\n");
+    const arrayOfWords = content.trim().split(/\s+/)
+    const bytes = Buffer.byteLength(content, "utf-8");
+    const lines = arrayOfLines.length -1;
+    const words = arrayOfWords.length;
+    totalLines += lines;
+    totalBytes += bytes;
+    totalWords +=words
+    if (countLines && countWords) {
+      process.stdout.write(`       ${lines}      ${words} ${file}\n`);
+
+    } else if (countLines) {
+      process.stdout.write(`       ${lines} ${file}\n`);
+
+    } else if (countWords){
+      process.stdout.write(`  ${words} ${file}\n`);
+
+    } else if (countBytes) {
+      process.stdout.write(`   ${bytes} ${file}\n`);
+
+    } else {
+      process.stdout.write(`       ${lines}      ${words}      ${bytes} ${file}\n`);
+    }
+
+  } catch(err) {
+    console.error(err.message);
+  }
+}
+
+if (files.length > 1 ) {
+  if (countLines && countWords) {
+    process.stdout.write(`       ${totalLines}      ${totalWords} total\n`);
+
+  } else if (countLines) {
+    process.stdout.write(`       ${totalLines} total\n`);
+
+  } else if (countWords){
+    process.stdout.write(`  ${totalWords} total\n`);
+
+  } else if (countBytes) {
+    process.stdout.write(`   ${totalBytes} total\n`);
+
+  } else {
+    process.stdout.write(`       ${totalLines}      ${totalWords}      ${totalBytes} total\n`);
+  }
+}
+
+
+
+
+