Add dadd package

packages/dadd/0.1.0/README.md

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+# dadd - Date Add
+
+This package is an utility for quick date calculation like insert the date that is +12 from tomorrow,
+or -5 day from today.
+
+The package contain only one trigger that is :dadd (short for date add).
+
+![screenshot](screenshot.png)
+
+The form has two field: 
+   - Day num: Number of days to add or extract. For extraction use negative number.
+   - Date base (YYYY-MM-DD format): The date that will be used for add or extract. 'Today' and 'Now' are also valid values. 'Today' is the default.
+
+The output will be also in YYYY-MM-DD format.
+
+# Installation
+
+```
+espanso install dadd
+espanso restart
+```

packages/dadd/0.1.0/_manifest.yml

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+name: "dadd"
+title: "Date add package"
+description: An utility for quick date calculations
+homepage: "https://github.com/undergrinder/espanso-hub/tree/main/packages/dadd/0.1.0"
+version: 0.1.0
+author: undergrinder
+tags: ["math", "utility"]

packages/dadd/0.1.0/package.yml

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+matches:
+  - trigger: ":dadd"
+    replace: "{{result_dateadd}}"
+    vars:
+      - name: "input_dateadd"
+        type: "form"
+        params:
+          layout: |
+            Day num: [[dayTimeDelta]]
+            Date base (YYYY-MM-DD format): [[dateBase]]
+          fields:
+            dayTimeDelta:
+              default: "1"
+            dateBase:
+              default: "today"
+      - name: result_dateadd
+        type: script
+        params:
+          args:
+            - python
+            - -c
+            - |
+              from datetime import datetime, timedelta             
+              clean_input = '{{input_dateadd.dateBase}}'.strip("' \"").replace('.', '-')
+              if clean_input in ['now', 'today']:
+                dt = datetime.today().date()
+              else:
+                dt = datetime.strptime(clean_input, '%Y-%m-%d')
+              print(f"{dt + timedelta(days=int('{{input_dateadd.dayTimeDelta}}'))}")