Added MathJS Library

3 files changed, 79 insertions, 4 deletions

diff --git a/bin/index.js b/bin/index.js
index 6c1d14b..6d87d1d 100644
--- a/bin/index.js
+++ b/bin/index.js
@@ -5,6 +5,7 @@ const terminalLink = require('terminal-link');
 const boxen = require("boxen");
 const chalk = require("chalk");
 const packageInfo = require('./../package.json');
+const math = require('mathjs');
 const infoMessage = {
     getIntroductoryMessage: () => {
         // If the command is run without any options we will show the about screen
@@ -38,7 +39,7 @@ Command Help Example:
   $0 add --help`)
     .command({
         command: 'add',
-        describe: 'Takes a list of numbers all separated by commas and adds them and returns the output. Optional arguments can be passed.',
+        describe: 'Takes a list of numbers all separated by commas and adds them consecutively and returns the output. Optional arguments can be passed.',
         builder: (yargs) => yargs
             .option('rt', {
                 alias: 'round-to',
@@ -47,10 +48,28 @@ Command Help Example:
             }),
         handler: function (args) {
             if (args._.length === 2) {
-                const result = args._[1].split(',').reduce((a, b) => Number(a) + Number(b), 0)
-                console.log(args.rt ? Math.round((result + Number.EPSILON) * Math.pow(10, args.rt)) / Math.pow(10, args.rt) : result)
+                const result = math.evaluate(args._[1].split(',').join('+'));
+                console.log(args.rt ? math.round(result, args.rt) : result)
             } else {
-                infoMessage.showError('add', 'needs a list of comma-separated numbers to be passed.');
+                infoMessage.showError('add', `needs 2 arugments, ${args._.length} passed.`);
+            }
+        }
+    })
+    .command({
+        command: ['sub', 'subtract'],
+        describe: 'Takes a list of numbers all separated by commas and subtracts them consecutively and returns the output. Optional arguments can be passed.',
+        builder: (yargs) => yargs
+            .option('rt', {
+                alias: 'round-to',
+                desc: 'Round upto the number of decimal places passed',
+                type: 'number'
+            }),
+        handler: function (args) {
+            if (args._.length === 2) {
+                const result = math.evaluate(args._[1].split(',').join('-'));
+                console.log(args.rt ? math.round(result, args.rt) : result)
+            } else {
+                infoMessage.showError('subtract', `needs 2 arugments, ${args._.length} passed.`);
             }
         }
     })
diff --git a/package-lock.json b/package-lock.json
index d91760d..28806e8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -133,6 +133,16 @@
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
     },
+    "complex.js": {
+      "version": "2.0.12",
+      "resolved": "https://registry.npmjs.org/complex.js/-/complex.js-2.0.12.tgz",
+      "integrity": "sha512-oQX99fwL6LrTVg82gDY1dIWXy6qZRnRL35N+YhIX0N7tSwsa0KFy6IEMHTNuCW4mP7FS7MEqZ/2I/afzYwPldw=="
+    },
+    "decimal.js": {
+      "version": "10.2.1",
+      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.2.1.tgz",
+      "integrity": "sha512-KaL7+6Fw6i5A2XSnsbhm/6B+NuEA7TZ4vqxnd5tXz9sbKtrN9Srj8ab4vKVdK8YAqZO9P1kg45Y6YLoduPf+kw=="
+    },
     "emoji-regex": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
@@ -143,11 +153,21 @@
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
       "integrity": "sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw=="
     },
+    "escape-latex": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/escape-latex/-/escape-latex-1.2.0.tgz",
+      "integrity": "sha512-nV5aVWW1K0wEiUIEdZ4erkGGH8mDxGyxSeqPzRNtWP7ataw+/olFObw7hujFWlVjNsaDFw5VZ5NzVSIqRgfTiw=="
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
+    "fraction.js": {
+      "version": "4.0.13",
+      "resolved": "https://registry.npmjs.org/fraction.js/-/fraction.js-4.0.13.tgz",
+      "integrity": "sha512-E1fz2Xs9ltlUp+qbiyx9wmt2n9dRzPsS11Jtdb8D2o+cC7wr9xkkKsVKJuBX0ST+LVS+LhLO+SbLJNtfWcJvXA=="
+    },
     "get-caller-file": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
@@ -163,11 +183,36 @@
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
       "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
     },
+    "javascript-natural-sort": {
+      "version": "0.7.1",
+      "resolved": "https://registry.npmjs.org/javascript-natural-sort/-/javascript-natural-sort-0.7.1.tgz",
+      "integrity": "sha1-+eIwPUUH9tdDVac2ZNFED7Wg71k="
+    },
+    "mathjs": {
+      "version": "9.2.0",
+      "resolved": "https://registry.npmjs.org/mathjs/-/mathjs-9.2.0.tgz",
+      "integrity": "sha512-R2fQxaOmyifxgP4+c59dnfLwpKI1KYHdnT5lLwDuHIZvgyGb71M8ay6kTJTEv9rG04pduqvX4tbBUoG5ypTF8A==",
+      "requires": {
+        "complex.js": "^2.0.11",
+        "decimal.js": "^10.2.1",
+        "escape-latex": "^1.2.0",
+        "fraction.js": "^4.0.13",
+        "javascript-natural-sort": "^0.7.1",
+        "seedrandom": "^3.0.5",
+        "tiny-emitter": "^2.1.0",
+        "typed-function": "^2.0.0"
+      }
+    },
     "require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
       "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I="
     },
+    "seedrandom": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/seedrandom/-/seedrandom-3.0.5.tgz",
+      "integrity": "sha512-8OwmbklUNzwezjGInmZ+2clQmExQPvomqjL7LFqOYqtmuxRgQYqOD3mHaU+MvZn5FLUeVxVfQjwLZW/n/JFuqg=="
+    },
     "string-width": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -232,11 +277,21 @@
         "supports-hyperlinks": "^2.0.0"
       }
     },
+    "tiny-emitter": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz",
+      "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q=="
+    },
     "type-fest": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.5.2.tgz",
       "integrity": "sha512-DWkS49EQKVX//Tbupb9TFa19c7+MK1XmzkrZUR8TAktmE/DizXoaoJV6TZ/tSIPXipqNiRI6CyAe7x69Jb6RSw=="
     },
+    "typed-function": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/typed-function/-/typed-function-2.0.0.tgz",
+      "integrity": "sha512-Hhy1Iwo/e4AtLZNK10ewVVcP2UEs408DS35ubP825w/YgSBK1KVLwALvvIG4yX75QJrxjCpcWkzkVRB0BwwYlA=="
+    },
     "widest-line": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-3.1.0.tgz",
diff --git a/package.json b/package.json
index fd398a0..f5b5189 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
   "dependencies": {
     "boxen": "^4.0.0",
     "chalk": "^2.4.2",
+    "mathjs": "^9.2.0",
     "terminal-link": "^2.1.1",
     "yargs": "^16.2.0"
   }