London | 26-SDC-July | AYK| Sprint 3 | Implement shell tools

implement-shell-tools/cat/cat.js

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+import {program} from "commander";
+import {promises as fs} from "node:fs";
+import process from "node:process";
+
+program 
+.name ("cat")
+.description ("A JS clone for unix command cat")
+.argument("<files...>","One or more files to reach and print")
+.option("-n", "number all output lines")
+.action(async (files,options)=> {
+  for (const filePath of files){
+    try {
+        const content = await fs.readFile(filePath,"utf8");
+        if (options.n)
+        {
+            const lines = content.trimEnd().split("\n");
+            lines.forEach((line,index) => {
+            console.log(`${index+1} \t ${line}`);
+            });
+        }
+        else 
+        {
+            process.stdout.write(content);
+        }
+
+
+    }
+    catch(error)
+    {
+        console.error("No such file or directory");
+        process.exit(1);
+    }
+
+  }  
+
+});
+
+program.parse(process.argv);

implement-shell-tools/cat/package.json

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+{
+  "type":"module" ,
+  "dependencies": {
+    "commander": "^15.0.0"
+  }
+}

implement-shell-tools/ls/ls.js

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+import {program} from "commander";
+import process from "node:process";
+import {promises as fs } from "node:fs";
+
+
+program
+.name ("list command clone")
+.description("List all files & folders within current folder")
+.argument("[directory]","Directory to list",".")
+.option("-1","list file line by line")
+.action(async (directory,options) =>
+{
+    try 
+    {
+        let files = await fs.readdir(directory);
+        console.log(files.join(" "));
+    }
+
+    catch (error)
+    {
+        console.error('No such file or directory');
+        process.exit(1);
+    }
+
+});
+
+program.parse(process.argv);

implement-shell-tools/ls/package.json

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+{
+  "type": "module",
+  "dependencies": {
+    "commander": "^15.0.0"
+  }
+}

implement-shell-tools/wc/package.json

@@ -0,0 +1,7 @@
+{
+    "type": "module",
+    "dependencies": {
+      "commander": "^15.0.0"
+    }
+  }
+

implement-shell-tools/wc/wc.js

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+import process from "node:process";
+import {program} from "commander";
+import {promises as fs} from "node:fs";
+
+program
+.name("WC clone")
+.description("Counting each words in a given file")
+.argument("<files...>","one or more files to count the words")
+.action(async (files)=>{
+    let totalLines = 0;
+    let totalWords = 0;
+    let totalBytes = 0;
+
+    for (const file of files){
+        try {
+        const content = await fs.readFile(file,"utf-8");
+        const size = await fs.readFile(file);
+
+        const lineCount = content.split("\n").length-1;
+
+        const wordCount = content.trim() === "" ? 0 : content.trim().split(/\s+/).length;
+
+        const byteCount = size.length;
+
+        totalLines += lineCount;
+        totalWords += wordCount;
+        totalBytes += byteCount;
+
+        printCounts({lineCount,wordCount,byteCount,label:file,});
+    }
+
+catch (err){
+    console.error("No such file or directory");
+    process.exit(1);
+}
+    }
+
+    if (files.length>1)
+    {
+        printCounts({lineCount:totalLines,
+            wordCount:totalWords,
+            byteCount:totalBytes,
+            label:"Total",
+        })
+    }
+
+});
+
+function printCounts({lineCount,wordCount,byteCount,label})
+{
+    let output = "";
+
+    output += lineCount.toString().padStart(7, " ");
+    output += wordCount.toString().padStart(7," ");
+    output += byteCount.toString().padStart(7," ");
+
+    console.log(`${output} ${label}`);
+}
+
+program.parse(process.argv);