From cd69f3b04bd42005a181b5c7459de5ec7f2aa572 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Thu, 31 Oct 2024 19:09:15 +0100
Subject: diff modifier

---
 metchart/modifier/diff.py | 6 ++++++
 pyproject.toml            | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 metchart/modifier/diff.py

diff --git a/metchart/modifier/diff.py b/metchart/modifier/diff.py
new file mode 100644
index 0000000..496acf7
--- /dev/null
+++ b/metchart/modifier/diff.py
@@ -0,0 +1,6 @@
+def run(data, vars):
+    ret = data[0]
+    for var in vars:
+        ret[var['name']] = ret[var['field']].diff(var['by'])
+
+    return ret
diff --git a/pyproject.toml b/pyproject.toml
index d5f2744..d5a60bd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "metchart"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
 	"metpy",
 	"xarray",
-- 
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