Add calculator example

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Command/Command/AddSamples.php

@@ -75,6 +75,32 @@ class AddSamples extends Base {
 			);
 		}
 
+		try {
+			$this->service->find('', 'calculator');
+		} catch (DoesNotExistException $e) {
+			$commands[] = $this->service->create(
+				'',
+				'calculator',
+				'Calculator',
+				$appPath . '/sample-commands/calc.sh "{ARGUMENTS_DOUBLEQUOTE_ESCAPED}"',
+				Command::RESPONSE_USER,
+				Command::ENABLED_ALL
+			);
+		}
+
+		try {
+			$this->service->find('', 'calc');
+		} catch (DoesNotExistException $e) {
+			$commands[] = $this->service->create(
+				'',
+				'calc',
+				'Calculator',
+				'alias:calculator',
+				Command::RESPONSE_ALL,
+				Command::ENABLED_ALL
+			);
+		}
+
 		try {
 			$this->service->find('', 'hackernews');
 		} catch (DoesNotExistException $e) {

sample-commands/calc.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+while test $# -gt 0; do
+  case "$1" in
+    --help)
+      echo "/calc - A basic calculator for Nextcloud Talk based on gnu BC"
+      echo "See the official documentation for more information:"
+      echo "https://www.gnu.org/software/bc/manual/html_mono/bc.html"
+      echo " "
+      echo "Simple equations: /calc 3 + 4 * 5"
+      echo "Complex equations: /calc sin(3) + 3^3 * sqrt(5)"
+      exit 0
+      ;;
+    *)
+      break
+      ;;
+ esac
+done
+
+CALCULATOR=$(which "bc")
+if ! [ -x "$CALCULATOR" ]; then
+  echo "Basic calculator package (bc) not found"
+  exit 1
+fi
+
+
+set -f
+echo "$@ ="
+echo $(echo "$@" | bc)