todo-txt 3.0.1

Parser for the todo.txt format
Documentation 
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use std::collections::BTreeMap;

#[derive(Clone, Debug, PartialEq, Eq, Hash)]
#[cfg_attr(
    feature = "serde-support",
    derive(serde_derive::Serialize, serde_derive::Deserialize)
)]
pub struct Simple {
    pub subject: String,
    #[cfg_attr(feature = "serde-support", serde(default))]
    pub priority: crate::Priority,
    pub create_date: Option<crate::Date>,
    pub finish_date: Option<crate::Date>,
    #[cfg_attr(feature = "serde-support", serde(default))]
    pub finished: bool,
    pub threshold_date: Option<crate::Date>,
    pub due_date: Option<crate::Date>,
    #[cfg_attr(feature = "serde-support", serde(default))]
    pub contexts: Vec<String>,
    #[cfg_attr(feature = "serde-support", serde(default))]
    pub projects: Vec<String>,
    #[cfg_attr(feature = "serde-support", serde(default))]
    pub hashtags: Vec<String>,
    #[cfg_attr(feature = "serde-support", serde(default))]
    pub tags: BTreeMap<String, String>,
}

impl Simple {
    pub fn complete(&mut self) {
        let today = chrono::Local::now().date_naive();

        self.finished = true;
        if self.create_date.is_some() {
            self.finish_date = Some(today);
        }
    }

    pub fn uncomplete(&mut self) {
        self.finished = false;
        self.finish_date = None;
    }
}

impl Default for Simple {
    fn default() -> Self {
        Self {
            subject: String::new(),
            priority: crate::Priority::lowest(),
            create_date: None,
            finish_date: None,
            finished: false,
            threshold_date: None,
            due_date: None,
            contexts: Vec::new(),
            projects: Vec::new(),
            hashtags: Vec::new(),
            tags: BTreeMap::new(),
        }
    }
}

impl std::str::FromStr for Simple {
    type Err = crate::Error;

    fn from_str(s: &str) -> Result<Simple, Self::Err> {
        Ok(crate::parser::task(s))
    }
}

impl std::fmt::Display for Simple {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        if self.finished {
            f.write_str("x ")?;
        }

        if !self.priority.is_lowest() {
            f.write_str(format!("({}) ", self.priority).as_str())?;
        }

        if let Some(finish_date) = self.finish_date {
            f.write_str(format!("{} ", finish_date.format("%Y-%m-%d")).as_str())?;
        }

        if let Some(create_date) = self.create_date {
            f.write_str(format!("{} ", create_date.format("%Y-%m-%d")).as_str())?;
        }

        f.write_str(self.subject.as_str())?;

        if let Some(due_date) = self.due_date {
            f.write_str(format!(" due:{}", due_date.format("%Y-%m-%d")).as_str())?;
        }

        if let Some(threshold_date) = self.threshold_date {
            f.write_str(format!(" t:{}", threshold_date.format("%Y-%m-%d")).as_str())?;
        }

        for (key, value) in &self.tags {
            f.write_str(format!(" {key}:{value}").as_str())?;
        }

        Ok(())
    }
}

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

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

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

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

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