lunar-lib 0.6.1

Common utilities for lunar applications
Documentation 
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use std::{collections::HashMap, convert::Infallible};

use crate::formatter::Taggable;

/// The format table for `key=value` pairs used when rendering `Arguments`, like in `format()`
#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct FormatTable {
    table: HashMap<String, String>,
}

impl FormatTable {
    /// Creates a new, empty format table
    pub fn new() -> Self {
        Self {
            table: HashMap::new(),
        }
    }

    /// Adds a single `key=value` pair to the table
    pub fn add_entry(&mut self, key: impl Into<String>, value: impl Into<String>) {
        self.table
            .insert(key.into().to_ascii_lowercase(), value.into());
    }

    /// Extends the table with an iterator of `key=value` pairs
    pub fn add_table(&mut self, table: impl IntoIterator<Item = (String, String)>) {
        self.table.extend(table);
    }

    /// Extends the table with any [`Taggable`]
    pub fn extend_from_taggable<T: Taggable>(&mut self, from: &T) -> Result<(), T::Err> {
        from.fill_table(self)
    }

    /// Gets the the held table of `self`
    pub fn table(&self) -> &HashMap<String, String> {
        &self.table
    }
}

impl Taggable for FormatTable {
    type Err = Infallible;

    fn fill_table(&self, table: &mut FormatTable) -> Result<(), Infallible> {
        table.table.extend(self.table.clone());
        Ok(())
    }
}