1 files changed, 105 insertions, 0 deletions
diff --git a/src/modules/time.rs b/src/modules/time.rs
new file mode 100644
index 000000000..344c17cfb
--- /dev/null
+++ b/src/modules/time.rs
@@ -0,0 +1,105 @@
+use ansi_term::Color;
+use chrono::{DateTime, Local};
+
+use super::{Context, Module};
+
+/// Outputs the current time
+pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
+    let mut module = context.new_module("time");
+
+    if module.config_value_bool("disabled").unwrap_or(true) {
+        return None;
+    }
+
+    let module_style = module
+        .config_value_style("style")
+        .unwrap_or_else(|| Color::Yellow.bold());
+    module.set_style(module_style);
+
+    // Load module settings
+    let is_12hr = module.config_value_bool("12hr").unwrap_or(false);
+
+    let default_format = if is_12hr { "%r" } else { "%T" };
+    let time_format = module
+        .config_value_str("format")
+        .unwrap_or(default_format)
+        .to_owned();
+
+    log::trace!(
+        "Timer module is enabled with format string: {}",
+        time_format
+    );
+
+    let local: DateTime<Local> = Local::now();
+    let formatted_time_string = format_time(&time_format, local);
+    module.new_segment("time", &formatted_time_string);
+    module.get_prefix().set_value("at ");
+
+    Some(module)
+}
+
+/// Format a given time into the given string. This function should be referentially
+/// transparent, which makes it easy to test (unlike anything involving the actual time)
+fn format_time(time_format: &str, local_time: DateTime<Local>) -> String {
+    local_time.format(time_format).to_string()
+}
+
+/* Because we cannot make acceptance tests for the time module, these unit
+tests become extra important */
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::offset::TimeZone;
+
+    const FMT_12: &str = "%r";
+    const FMT_24: &str = "%T";
+
+    #[test]
+    fn test_midnight_12hr() {
+        let time = Local.ymd(2014, 7, 8).and_hms(0, 0, 0);
+        let formatted = format_time(FMT_12, time);
+        assert_eq!(formatted, "12:00:00 AM");
+    }
+
+    #[test]
+    fn test_midnight_24hr() {
+        let time = Local.ymd(2014, 7, 8).and_hms(0, 0, 0);
+        let formatted = format_time(FMT_24, time);
+        assert_eq!(formatted, "00:00:00");
+    }
+
+    #[test]
+    fn test_noon_12hr() {
+        let time = Local.ymd(2014, 7, 8).and_hms(12, 0, 0);
+        let formatted = format_time(FMT_12, time);
+        assert_eq!(formatted, "12:00:00 PM");
+    }
+
+    #[test]
+    fn test_noon_24hr() {
+        let time = Local.ymd(2014, 7, 8).and_hms(12, 0, 0);
+        let formatted = format_time(FMT_24, time);
+        assert_eq!(formatted, "12:00:00");
+    }
+
+    #[test]
+    fn test_arbtime_12hr() {
+        let time = Local.ymd(2014, 7, 8).and_hms(15, 36, 47);
+        let formatted = format_time(FMT_12, time);
+        assert_eq!(formatted, "03:36:47 PM");
+    }
+
+    #[test]
+    fn test_arbtime_24hr() {
+        let time = Local.ymd(2014, 7, 8).and_hms(15, 36, 47);
+        let formatted = format_time(FMT_24, time);
+        assert_eq!(formatted, "15:36:47");
+    }
+
+    #[test]
+    fn test_format_with_paren() {
+        let time = Local.ymd(2014, 7, 8).and_hms(15, 36, 47);
+        let formatted = format_time("[%T]", time);
+        assert_eq!(formatted, "[15:36:47]");
+    }
+}