more work on icaltime and icaltimezone

1 files changed, 27 insertions, 0 deletions

diff --git a/src/utils/dateutil.rs b/src/utils/dateutil.rs
index f76b9c1..c07b602 100644
--- a/src/utils/dateutil.rs
+++ b/src/utils/dateutil.rs
@@ -1,5 +1,9 @@
 use chrono::*;
 
+use std::path::PathBuf;
+use std::env;
+use utils::fileutil;
+
 pub fn date_from_str(date_str: &str) -> ParseResult<Date<Local>> {
   if date_str  == "today" || date_str == "now" {
     return Ok(Local::now().date());
@@ -30,6 +34,19 @@ pub fn week_from_str_begin(date_str: &str) -> Result<Date<Local>,String> {
   Err("Could not parse '{}' as week".to_string())
 }
 
+pub fn find_local_timezone() -> String {
+  if let Ok(candidate) = env::var("TZ") {
+    return candidate;
+  }
+  if let Ok(candidate) = fileutil::read_file_to_string(&PathBuf::from("/etc/timezone")) {
+    return candidate;
+  }
+  if let Ok(candidate) = fileutil::read_file_to_string(&PathBuf::from("/etc/localtime")) {
+    return candidate;
+  }
+  "UTC".to_owned()
+}
+
 #[cfg(not(test))]
 pub fn now() -> DateTime<Utc> {
   Utc::now()
@@ -66,6 +83,8 @@ pub fn datetime_from_timestamp(timestamp: &str) -> Option<DateTime<Local>> {
 mod tests {
   use super::*;
 
+  use testdata;
+
   #[test]
   fn test_date_from_str() {
     let date = date_from_str("2018-12-10").unwrap();
@@ -128,4 +147,12 @@ mod tests {
     let dt = Utc.ymd(2019, 01, 11).and_hms(19, 24, 47);
     assert_eq!(dt, dt_from_ts);
   }
+
+  #[test]
+  fn test_find_local_timezone() {
+    testdata::setup();
+
+    let tz_name = find_local_timezone();
+    assert_eq!("Europe/Berlin", tz_name);
+  }
 }