Add pop-count (#201)

config.json

@@ -91,6 +91,14 @@
           "math"
         ]
       },
+      {
+        "slug": "pop-count",
+        "name": "Eliud's Eggs",
+        "uuid": "1e435e36-82e7-461f-aad7-fbf51d39ba76",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1
+      },
       {
         "slug": "flatten-array",
         "name": "Flatten Array",

exercises/practice/pop-count/.docs/instructions.md

@@ -0,0 +1,8 @@
+# Instructions
+
+Your task is to count the number of 1 bits in the binary representation of a number.
+
+## Restrictions
+
+Keep your hands off that bit-count functionality provided by your standard library!
+Solve this one yourself using other basic tools instead.

exercises/practice/pop-count/.docs/introduction.md

@@ -0,0 +1,47 @@
+# Introduction
+
+Your friend Eliud inherited a farm from her grandma Tigist.
+Her granny was an inventor and had a tendency to build things in an overly complicated manner.
+The chicken coop has a digital display showing an encoded number representing the positions of all eggs that could be picked up.
+
+Eliud is asking you to write a program that shows the actual number of eggs in the coop.
+
+The position information encoding is calculated as follows:
+
+1. Scan the potential egg-laying spots and mark down a `1` for an existing egg or a `0` for an empty spot.
+2. Convert the number from binary to decimal.
+3. Show the result on the display.
+
+Example 1:
+
+```text
+Chicken Coop:
+ _ _ _ _ _ _ _
+|E| |E|E| | |E|
+
+Resulting Binary:
+ 1 0 1 1 0 0 1
+
+Decimal number on the display:
+89
+
+Actual eggs in the coop:
+4
+```
+
+Example 2:
+
+```text
+Chicken Coop:
+ _ _ _ _ _ _ _ _
+| | | |E| | | | |
+
+Resulting Binary:
+ 0 0 0 1 0 0 0 0
+
+Decimal number on the display:
+16
+
+Actual eggs in the coop:
+1
+```

exercises/practice/pop-count/.meta/Example.cfc

@@ -0,0 +1,24 @@
+/**
+* Here is an example solution for the PopCount exercise
+*/
+component {
+
+	/**
+	* @returns 
+	*/
+	function eggCount( number ) {
+		return doEggCount(number, 0)
+	}
+
+	function doEggCount( value, eggs ) {
+		if (value == 0) {
+			return eggs
+		}
+
+		if (value % 2 != 0) {
+			return doEggCount( value \ 2, eggs + 1)
+		}
+
+		return doEggCount( value \ 2, eggs)
+	}
+}

exercises/practice/pop-count/.meta/ExampleTest.cfc

@@ -0,0 +1,7 @@
+component extends="PopCountTest" {
+
+	function beforeAll(){
+	  SUT = createObject( 'Solution' );
+	}
+
+}

exercises/practice/pop-count/.meta/config.json

@@ -0,0 +1,20 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "PopCount.cfc"
+    ],
+    "test": [
+      "PopCountTest.cfc"
+    ],
+    "example": [
+      ".meta/Example.cfc",
+      ".meta/ExampleTest.cfc"
+    ]
+  },
+  "blurb": "Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.",
+  "source": "Christian Willner, Eric Willigers",
+  "source_url": "https://forum.exercism.org/t/new-exercise-suggestion-pop-count/7632/5"
+}

exercises/practice/pop-count/.meta/tests.toml

@@ -0,0 +1,22 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[559e789d-07d1-4422-9004-3b699f83bca3]
+description = "0 eggs"
+
+[97223282-f71e-490c-92f0-b3ec9e275aba]
+description = "1 egg"
+
+[1f8fd18f-26e9-4144-9a0e-57cdfc4f4ff5]
+description = "4 eggs"
+
+[0c18be92-a498-4ef2-bcbb-28ac4b06cb81]
+description = "13 eggs"

exercises/practice/pop-count/PopCount.cfc

@@ -0,0 +1,13 @@
+/**
+* Your implementation of the PopCount exercise
+*/
+component {
+
+	/**
+	* @returns 
+	*/
+	function eggCount( number ) {
+		// Implement me here
+	}
+
+}

exercises/practice/pop-count/PopCountTest.cfc

@@ -0,0 +1,31 @@
+component extends="testbox.system.BaseSpec" {
+
+	function beforeAll(){
+	  SUT = createObject( 'PopCount' );
+	}
+
+	function run(){
+
+		describe( "My PopCount class", function(){			
+
+			it( '0 eggs', function(){
+				expect( SUT.eggCount( number='0' ) ).toBe( '0' );
+			});
+
+			it( '1 egg', function(){
+				expect( SUT.eggCount( number='16' ) ).toBe( '1' );
+			});
+
+			it( '4 eggs', function(){
+				expect( SUT.eggCount( number='89' ) ).toBe( '4' );
+			});
+
+			it( '13 eggs', function(){
+				expect( SUT.eggCount( number='2000000000' ) ).toBe( '13' );
+			});
+
+		});
+
+	}
+
+}

exercises/practice/pop-count/TestRunner.cfc

@@ -0,0 +1,103 @@
+/**
+* I am a CommandBox task runner which you can use to test your implementation of this exercise against the 
+* provided test suite.  To use me, open the CommandBox CLI and run this:
+* 
+* CommandBox> task run TestRunner
+*
+* To start up a test watcher that will automatically rerun the test suite every time you save a file change, run this:
+*
+* CommandBox> task run TestRunner --watcher
+*
+*/
+component {
+
+	/**
+	* @solution Runs the tests against the solution
+	* @watcher Start up a file watch that re-runs the tests on file changes. Use Ctrl-C to stop
+	*/
+	function run( boolean solution=false, boolean watcher=false ) {
+
+		ensureTestBox();
+
+		if( watcher ) {
+
+			// Tabula rasa
+			command( 'cls' ).run();
+
+			// Start watcher
+			watch()
+				.paths( '*.cfc' )
+				.inDirectory( getCWD() )
+				.withDelay( 500 )
+				.onChange( function() {
+
+					// Clear the screen
+					command( 'cls' )
+						.run();
+
+					// This is neccessary so changes to tests get picked up right away.
+					pagePoolClear();	
+
+					runTests( solution );
+
+				} )
+				.start();
+
+		} else {
+			runTests( solution );
+		}			
+
+	}
+
+	/**
+	* Make sure the TestBox framework is installed
+	*/
+	private function ensureTestBox() {
+		var excerciseRoot = getCWD();
+		var testBoxRoot = excerciseRoot & '/testbox';
+
+		if( !directoryExists( testBoxRoot ) ) {
+
+			print.boldYellowLine( 'Installing some missing dependencies for you!' ).toConsole();
+			command( 'install' )
+				.inWorkingDirectory( excerciseRoot )
+				.run();
+		}
+
+		// Bootstrap TestBox framework
+		filesystemUtil.createMapping( '/testbox', testBoxRoot );
+	}
+
+	/**
+	* Invoke TestBox to run the test suite
+	*/
+	private function runTests( boolean solution=false ) {
+
+		// Create TestBox and run the tests
+		testData = new testbox.system.TestBox()
+			.runRaw( directory = {
+				// Find all CFCs...
+				mapping = filesystemUtil.makePathRelative( getCWD() ),
+				// ... in this directory ...
+				recurse = false,
+				// ... whose name ends in "test"
+				filter = function( path ) {
+					return path.reFind( ( solution ? 'Solution' : '' ) & 'Test.cfc$' );
+				 }
+			} )
+			.getMemento();
+
+		// Print out the results with ANSI formatting for the CLI
+		getInstance( 'CLIRenderer@testbox-commands' )
+			.render( print, testData, true );
+
+		print.toConsole();
+
+		// Set proper exit code
+		if( testData.totalFail || testData.totalError ) {
+			setExitCode( 1 );
+		}
+	}
+
+}
+

exercises/practice/pop-count/box.json

@@ -0,0 +1,8 @@
+{
+    "dependencies":{
+        "testbox":"^2.5.0+107"
+    },
+    "installPaths":{
+        "testbox":"testbox/"
+    }
+}

exercises/practice/pop-count/index.cfm

@@ -0,0 +1,37 @@
+<!--- 
+
+This file will only be used if you want to start up a web server in this directory.  You can do so by running:
+
+$> box
+CommandBox> install
+CommandBox> server start
+
+However, this is not necessary unless you really just want to use the HTML reporters on TestBox.  
+Ideally, you'll skip the need for this file entirely and just run the tests directly frm the CLI like this:
+
+CommandBox> task run TestRunner
+
+ --->
+<cfsetting showDebugOutput="false">
+<cfparam name="url.reporter" 		default="simple">
+<cfscript>
+	// get a list of all CFCs in this folder whose name looks like "XXXTest.cfc"
+	// And turn it into compnent path relative to the web root
+	url.bundles = directoryList(
+			path=expandPath( '/' ),
+			filter='*Test.cfc' )
+		.map( function( path ) {
+			return path
+					.replaceNoCase( expandPath( '/' ), '' )
+					.left( -4 )
+		} )
+		.toList();
+</cfscript>
+
+<!--- Ensure TestBox --->
+<cfif fileExists( "/testbox/system/runners/HTMLRunner.cfm" )>
+	<!--- Include the TestBox HTML Runner --->
+	<cfinclude template="/testbox/system/runners/HTMLRunner.cfm">
+<cfelse>
+	Oops, you don't have TestBox installed yet! Please run <b>box install</b> from the root of your excercise folder and refresh this page.	
+</cfif>