Add config parsing helpers

bin/domain/imag-diary/src/util.rs

@@ -18,6 +18,10 @@
 //
 
 use libimagrt::runtime::Runtime;
+use libimagdiary::error::*;
+
+use toml::Value;
+use toml_query::read::TomlValueReadExt;
 
 pub fn get_diary_name(rt: &Runtime) -> Option<String> {
     use libimagdiary::config::get_default_diary_name;
@@ -26,3 +30,56 @@ pub fn get_diary_name(rt: &Runtime) -> Option<String> {
         .or(rt.cli().value_of("diaryname").map(String::from))
 }
 
+pub enum Timed {
+    Hourly,
+    Minutely,
+}
+
+/// Returns true if the diary should always create timed entries, which is whenever
+///
+/// ```toml
+/// diary.diaries.<diary>.timed = true
+/// ```
+///
+/// # Returns
+///
+/// * Ok(Some(Timed::Hourly)) if diary should create timed entries
+/// * Ok(Some(Timed::Minutely)) if diary should not create timed entries
+/// * Ok(None) if config is not available
+/// * Err(e) if reading the toml failed, type error or something like this
+///
+pub fn get_diary_timed_config(rt: &Runtime, diary_name: &str) -> Result<Option<Timed>> {
+    match rt.config() {
+        None      => Ok(None),
+        Some(cfg) => {
+            let v = cfg
+                .config()
+                .read(&format!("diary.diaries.{}.timed", diary_name))
+                .chain_err(|| DiaryErrorKind::IOError);
+
+            match v {
+                Ok(Some(&Value::String(ref s))) => parse_timed_string(s, diary_name).map(Some),
+
+                Ok(Some(_)) => {
+                    let s = format!("Type error at 'diary.diaryies.{}.timed': should be either 'h'/'hourly' or 'm'/'minutely'", diary_name);
+                    Err(s).map_err(From::from)
+                },
+
+                Ok(None) => Ok(None),
+                Err(e) => Err(e),
+            }
+        }
+    }
+}
+
+pub fn parse_timed_string(s: &str, diary_name: &str) -> Result<Timed> {
+    if s == "h" || s == "hourly" {
+        Ok(Timed::Hourly)
+    } else if s == "m" || s == "minutely" {
+        Ok(Timed::Minutely)
+    } else {
+        let s = format!("Cannot parse config: 'diary.diaries.{}.timed = {}'",
+                        diary_name, s);
+        Err(s).map_err(From::from)
+    }
+}