roughing in calendar

Cargo.lock

@@ -153,7 +153,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d59ae0466b83e838b81a54256c39d5d7c20b9d7daa10510a242d9b75abd5936e"
 dependencies = [
  "chrono",
- "chrono-tz-build",
+ "chrono-tz-build 0.2.1",
+ "phf 0.11.3",
+]
+
+[[package]]
+name = "chrono-tz"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "efdce149c370f133a071ca8ef6ea340b7b88748ab0810097a9e2976eaa34b4f3"
+dependencies = [
+ "chrono",
+ "chrono-tz-build 0.4.1",
  "phf 0.11.3",
 ]
 
@@ -168,6 +179,16 @@ dependencies = [
  "phf_codegen 0.11.3",
 ]
 
+[[package]]
+name = "chrono-tz-build"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f10f8c9340e31fc120ff885fcdb54a0b48e474bbd77cab557f0c30a3e569402"
+dependencies = [
+ "parse-zoneinfo",
+ "phf_codegen 0.11.3",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
@@ -607,6 +628,15 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "ical"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "356d82bd58997815d55ea6f9081bd4cac149e50ca943f7a4f7c050fec7271c1f"
+dependencies = [
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "icu_collections"
 version = "2.0.0"
@@ -1327,6 +1357,19 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "rrule"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "720acfb4980b9d8a6a430f6d7a11933e701ebbeba5eee39cc9d8c5f932aaff74"
+dependencies = [
+ "chrono",
+ "chrono-tz 0.10.3",
+ "log",
+ "regex",
+ "thiserror 2.0.12",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.24"
@@ -1938,9 +1981,11 @@ name = "trmnl"
 version = "0.1.0"
 dependencies = [
  "chrono",
- "chrono-tz",
+ "chrono-tz 0.8.6",
  "dirs",
+ "ical",
  "reqwest",
+ "rrule",
  "scraper",
  "serde",
  "serde_json",