todo-txt 2.0.0

Parser for the todo.txt format
Documentation 
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#[derive(Clone, Debug, PartialEq, Eq, Default)]
#[cfg_attr(
    feature = "serde-support",
    derive(serde_derive::Serialize, serde_derive::Deserialize)
)]
pub struct Extended {
    #[cfg_attr(feature = "serde-support", serde(flatten))]
    pub inner: super::Task,
    #[cfg_attr(feature = "serde-support", serde(default))]
    pub note: super::Note,
    pub recurrence: Option<super::Recurrence>,
    #[cfg_attr(feature = "serde-support", serde(default))]
    pub flagged: bool,
}

impl Extended {
    fn note(task: &super::Task) -> super::Note {
        if let Some(file) = task.tags.get(&Self::tag_name()) {
            super::Note::from_file(file)
        } else {
            super::Note::None
        }
    }

    fn tag_name() -> String {
        match std::env::var("TODO_NOTE_TAG") {
            Ok(tag) => tag,
            Err(_) => "note".to_owned(),
        }
    }
}

impl std::convert::From<super::Task> for Extended {
    fn from(task: super::Task) -> Self {
        use std::str::FromStr;

        let mut inner = task;

        let note = Self::note(&inner);
        inner.tags.remove(&Self::tag_name());

        let mut recurrence = None;

        if let Some(rec) = inner.tags.get(&"rec".to_owned()) {
            recurrence = match super::Recurrence::from_str(rec) {
                Ok(rec) => Some(rec),
                Err(_) => None,
            };
        }
        inner.tags.remove(&"rec".to_owned());

        let flagged = inner.tags.contains_key(&"f".to_owned());
        inner.tags.remove(&"f".to_owned());

        Self {
            note,
            inner,
            recurrence,
            flagged,
        }
    }
}

impl std::str::FromStr for Extended {
    type Err = ();

    fn from_str(s: &str) -> Result<Self, ()> {
        let task = super::Task::from_str(s)?;

        Ok(task.into())
    }
}

impl std::ops::Deref for Extended {
    type Target = super::Task;

    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

impl std::ops::DerefMut for Extended {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.inner
    }
}

impl std::fmt::Display for Extended {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        use std::ops::Deref;

        f.write_str(format!("{}", self.deref()).as_str())?;

        if self.note != super::Note::None {
            f.write_str(format!(" {}", self.note).as_str())?;
        }

        if let Some(ref recurrence) = self.recurrence {
            f.write_str(format!(" rec:{}", recurrence).as_str())?;
        }

        if self.flagged {
            f.write_str(" f:1")?;
        }

        Ok(())
    }
}

impl std::cmp::PartialOrd for Extended {
    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
        Some(self.cmp(other))
    }
}

impl std::cmp::Ord for Extended {
    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
        if self.inner.due_date != other.inner.due_date {
            return self.inner.due_date.cmp(&other.inner.due_date);
        }

        if self.inner.priority != other.inner.priority {
            return self.inner.priority.cmp(&other.inner.priority).reverse();
        }

        if self.inner.subject != other.inner.subject {
            return self.inner.subject.cmp(&other.inner.subject);
        }

        std::cmp::Ordering::Equal
    }
}