Merge pull request #25 from foundersandcoders/suggested-solution

add solutions folder for lesson-1 & lesson-2

Author: eliasmalik

solutions/lesson-1/cat.js

@@ -0,0 +1,12 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const path = process.argv[2];
+
+fs.readFile(process.cwd() + '/' + path, function(err, data) {
+    if (err) {
+        process.stdout.write('file dosnt exist');
+    } else {
+        process.stdout.write(data);
+    }
+});

solutions/lesson-1/grep.js

@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const pattern = process.argv[2]; // the word would you like to search
+const fileName = process.argv[3]; //the file name or path 
+
+fs.readFile(process.cwd() + '/' + fileName, function(err, data) {
+    if (err) {
+        process.stdout.write('file dosnt exist');
+    } else {
+        var arr = data.toString().split('\n');
+        //console.log(arr);
+        arr.forEach(function(line) {
+            if (line.includes(pattern))
+                process.stdout.write(line + '\n');
+        });
+
+    }
+});

solutions/lesson-1/ls.js

@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const path = process.cwd();
+
+if (process.argv[2] === '-ex') {
+    writeFiles(path, function(data) {
+        data.forEach(function(file) {
+            var fileExten = file.split('.');
+            if (fileExten[1] === process.argv[3])
+                process.stdout.write(file + '\n');
+        });
+    });
+} else {
+    writeFiles(path, function(data) {
+        data.forEach(function(file) {
+            process.stdout.write(file + '\n');
+        });
+    });
+}
+
+function writeFiles(pth, cb) {
+    fs.readdir(pth, function(err, data) {
+        if (err) {
+            process.stdout.write('file dosn\'t exist');
+        } else {
+            cb(data);
+        }
+    });
+}

solutions/lesson-2/append.js

@@ -0,0 +1,37 @@
+const fs = require('fs');
+const path = process.argv[2];
+
+if (process.argv[3] === '>>') {
+    var readStream = fs.createReadStream(path);
+    var writeStream = fs.createWriteStream(process.argv[4], { 'flags': 'a' });
+
+    readStream.pipe(writeStream);
+} else {
+
+    fs.readFile(process.cwd() + '/' + path, function(err, file) {
+        if (err) {
+            process.stdout.write('file dosnt exist');
+        } else {
+            process.stdout.write(file);
+        }
+    });
+}
+
+
+fs.readFile = function(file, cb) {
+
+    var readStream = fs.createReadStream(file);
+    var fileContent = '';
+
+    readStream.on('data', function(chunk) {
+        fileContent += chunk;
+    });
+
+    readStream.on('error', function(err) {
+        cb(err, fileContent)
+    });
+
+    readStream.on('end', function() {
+        cb(null, fileContent);
+    });
+}

solutions/lesson-2/cat.js

@@ -0,0 +1,29 @@
+const fs = require('fs');
+const path = process.argv[2];
+
+fs.readFile = function(file, cb) {
+
+    var readStream = fs.createReadStream(file);
+    var fileContent = '';
+
+    readStream.on('data', function(chunk) {
+        fileContent += chunk;
+    });
+
+    readStream.on('error', function(err) {
+        cb(err, fileContent)
+    });
+
+    readStream.on('end', function() {
+        cb(null, fileContent);
+    });
+}
+
+
+fs.readFile(process.cwd() + '/' + path, function(err, file) {
+    if (err) {
+        process.stdout.write('file dosnt exist');
+    } else {
+        process.stdout.write(file);
+    }
+});

solutions/lesson-2/piping.js

@@ -0,0 +1,27 @@
+const fs = require('fs');
+const path = process.argv[2];
+
+
+if (!path) {
+    var stdin = process.openStdin();
+    var data = '';
+    stdin.on('data', function(chunk) {
+        data += chunk;
+    });
+    stdin.on('end', () => {
+        var arr = data.toString().split('\n');
+        process.stdout.write(arr.length + '\n');
+    });
+} else {
+    var readStream = fs.createReadStream(path);
+    var fileContent = '';
+
+    readStream.on('data', function(chunk) {
+        fileContent += chunk;
+    });
+
+    readStream.on('end', function() {
+        var arr = fileContent.toString().split('\n');
+        process.stdout.write(arr.length + '\n');
+    });
+}

solutions/lesson-2/wc.js

@@ -0,0 +1,37 @@
+const fs = require('fs');
+const path = process.argv[2];
+
+if (process.argv[3] === '>') {
+    var readStream = fs.createReadStream(path);
+    var writeStream = fs.createWriteStream(process.argv[4]);
+
+    readStream.pipe(writeStream);
+} else {
+
+    fs.readFile(process.cwd() + '/' + path, function(err, file) {
+        if (err) {
+            process.stdout.write('file dosnt exist');
+        } else {
+            process.stdout.write(file);
+        }
+    });
+}
+
+
+fs.readFile = function(file, cb) {
+
+    var readStream = fs.createReadStream(file);
+    var fileContent = '';
+
+    readStream.on('data', function(chunk) {
+        fileContent += chunk;
+    });
+
+    readStream.on('error', function(err) {
+        cb(err, fileContent)
+    });
+
+    readStream.on('end', function() {
+        cb(null, fileContent);
+    });
+}