From de698035d771d46cff71e517d29d4d6e53f079cc Mon Sep 17 00:00:00 2001
From: Alexander Alemayhu <alexander@alemayhu.com>
Date: Sat, 5 Jan 2019 23:21:43 +0100
Subject: [PATCH] add the dates and filtering options

Signed-off-by: Alexander Alemayhu <alexander@alemayhu.com>
---
 src/index.js | 59 +++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 44 insertions(+), 15 deletions(-)

diff --git a/src/index.js b/src/index.js
index 05f9054..ec1c54f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,24 +1,53 @@
-const {Command, flags} = require('@oclif/command')
+const { Command, flags } = require("@oclif/command");
+
+// https://stackoverflow.com/questions/25588473/how-to-get-list-of-days-in-a-month-with-moment-js
+const lastTuesdayIn = (year, month) => {
+  const names = Object.freeze(["s", "m", "Tuesday", "w", "t", "f", "s"]);
+  const date = new Date(year, month - 1, 1);
+  const tuesdays = [];
+  while (date.getMonth() == month - 1) {
+    if (names[date.getDay()] === "Tuesday") {
+      tuesdays.push(date.toLocaleDateString());
+    }
+    date.setDate(date.getDate() + 1);
+  }
+  if (!tuesdays || tuesdays.length == 0) {
+    return undefined;
+  }
+  return tuesdays[tuesdays.length - 1];
+};
 
 class JamstackOsloLastTuesdayInCommand extends Command {
   async run() {
-    const {flags} = this.parse(JamstackOsloLastTuesdayInCommand)
-    const name = flags.name || 'world'
-    this.log(`hello ${name} from ./src/index.js`)
+    const { flags } = this.parse(JamstackOsloLastTuesdayInCommand);
+    const today = new Date();
+    const year = flags.year || today.getUTCFullYear();
+    const month = flags.month || today.getUTCMonth() + 1;
+    const remainder = flags.remainder || false;
+
+    if (remainder) {
+      for (let i = month; i <= 12; i++) {
+        this.log(lastTuesdayIn(year, i));
+      }
+    } else {
+      this.log(lastTuesdayIn(year, month));
+    }
   }
 }
 
-JamstackOsloLastTuesdayInCommand.description = `Describe the command here
-...
-Extra documentation goes here
-`
+JamstackOsloLastTuesdayInCommand.description = `Print out the last tuesdays
+Running without arguments will default ot the current year and month.`;
 
 JamstackOsloLastTuesdayInCommand.flags = {
-  // add --version flag to show CLI version
-  version: flags.version({char: 'v'}),
-  // add --help flag to show CLI version
-  help: flags.help({char: 'h'}),
-  name: flags.string({char: 'n', description: 'name to print'}),
-}
+  version: flags.version({ char: "v" }),
+  help: flags.help({ char: "h" }),
+  name: flags.string({ char: "n", description: "name to print" }),
+  month: flags.integer({ char: "m", description: "month for filter" }),
+  year: flags.integer({ char: "y", description: "year for filter" }),
+  remainder: flags.boolean({
+    char: "r",
+    description: "print all last remaining tuesdays"
+  })
+};
 
-module.exports = JamstackOsloLastTuesdayInCommand
+module.exports = JamstackOsloLastTuesdayInCommand;