duat_base/widgets/

prompt_line.rs

//! A multi-purpose widget
//!
//! This widget serves many purposes, of note is [running commands],
//! but it can also be used for [incremental search],
//! [piping selections], and even [user made functionalities].
//!
//! These functionalities are all controled by a [`Mode`] that has
//! control over the [`Text`] in the [`PromptLine`]. By default, that
//! is the [`Prompt`] mode, which can take in a [`PromptMode`] in
//! order to determine how the [`Text`] will be interpreted.
//!
//! [running commands]: crate::mode::RunCommands
//! [incremental search]: crate::mode::IncSearch
//! [piping selections]: crate::mode::PipeSelections
//! [user made functionalities]: PromptMode
//! [`Mode`]: crate::mode::Mode
//! [`Prompt`]: crate::modes::Prompt
use std::{any::TypeId, collections::HashMap};

use duat_core::{
    context::Handle,
    data::Pass,
    opts::PrintOpts,
    text::Text,
    ui::{PushSpecs, PushTarget, Side, Widget},
};

use crate::modes::PromptMode;

/// A multi purpose text [`Widget`]
///
/// This [`Widget`] will be used by a [`Prompt`]-type [`Mode`], which
/// in turn will make use of a [`PromptMode`]. These are "ways of
/// interpreting the input". In Duat, there are 3 built-in
/// [`PromptMode`]s:
///
/// - [`RunCommands`]: Will interpret the prompt as a Duat command to
///   be executed.
/// - [`IncSearch`]: Will read the prompt as a regex, and modify the
///   active [`Buffer`] according to a given [`IncSearcher`].
/// - [`PipeSelections`]: Will pass each selection to a shell command,
///   replacing the selections with the `stdout`.
///
/// [`Prompt`]: crate::modes::Prompt
/// [`Mode`]: duat_core::mode::Mode
/// [`RunCommands`]: crate::modes::RunCommands
/// [`IncSearch`]: crate::modes::IncSearch
/// [`Buffer`]: duat_core::buffer::Buffer
/// [`IncSearcher`]: crate::modes::IncSearcher
/// [`PipeSelections`]: crate::modes::PipeSelections
pub struct PromptLine {
    text: Text,
    prompts: HashMap<TypeId, Text>,
    request_width: bool,
}

impl PromptLine {
    /// Returns a [`PromptLineBuilder`], which can be used to push
    /// `PromptLine`s around
    pub fn builder() -> PromptLineBuilder {
        PromptLineBuilder::default()
    }

    /// Returns the prompt for a [`PromptMode`] if there is any
    pub fn prompt_of<M: PromptMode>(&self) -> Option<Text> {
        self.prompts.get(&TypeId::of::<M>()).cloned()
    }

    /// Sets the prompt for the given [`PromptMode`]
    pub fn set_prompt<M: PromptMode>(&mut self, text: Text) {
        self.prompts.entry(TypeId::of::<M>()).or_insert(text);
    }

    /// Returns the prompt for a [`TypeId`], if there is any
    pub fn prompt_of_id(&self, id: TypeId) -> Option<Text> {
        self.prompts.get(&id).cloned()
    }
}

impl Widget for PromptLine {
    fn update(pa: &mut Pass, handle: &Handle<Self>) {
        let (pl, area) = handle.write_with_area(pa);

        if pl.request_width {
            let width = area.width_of_text(pl.get_print_opts(), &pl.text).unwrap();
            area.set_width(width + pl.get_print_opts().scrolloff.x as f32)
                .unwrap();
        }

        if let Some(main) = pl.text.selections().get_main() {
            area.scroll_around_points(
                &pl.text,
                main.caret().to_two_points_after(),
                pl.get_print_opts(),
            );
        }
    }

    fn needs_update(&self, _: &Pass) -> bool {
        false
    }

    fn text(&self) -> &Text {
        &self.text
    }

    fn text_mut(&mut self) -> &mut Text {
        &mut self.text
    }

    fn get_print_opts(&self) -> PrintOpts {
        let mut opts = PrintOpts::default_for_input();
        opts.force_scrolloff = true;
        opts
    }
}

/// A builder for a new [`PromptLine`]
///
/// Can be acquired with [`PromptLine::builder`].
pub struct PromptLineBuilder {
    prompts: Option<HashMap<TypeId, Text>>,
    specs: PushSpecs,
    request_width: bool,
}

impl Default for PromptLineBuilder {
    fn default() -> Self {
        Self {
            prompts: None,
            specs: PushSpecs {
                side: Side::Below,
                height: Some(1.0),
                ..Default::default()
            },
            request_width: false,
        }
    }
}

impl PromptLineBuilder {
    /// Pushes a [`PromptLine`] onto a [`PushTarget`]
    ///
    /// This could be a [`Window`] or a [`Handle`], for a [`Buffer`],
    /// for example.
    ///
    /// [`Window`]: duat_core::ui::Window
    /// [`Buffer`]: duat_core::buffer::Buffer
    pub fn push_on(self, pa: &mut Pass, push_target: &impl PushTarget) -> Handle<PromptLine> {
        let prompt_line = PromptLine {
            text: Text::default(),
            prompts: self.prompts.unwrap_or_default(),
            request_width: self.request_width,
        };

        push_target.push_outer(pa, prompt_line, self.specs)
    }

    /// Changes the default [prompt] for a given [mode]
    ///
    /// [prompt]: Text
    /// [mode]: PromptMode
    pub fn set_prompt<M: PromptMode>(mut self, prompt: Text) -> Self {
        self.prompts
            .get_or_insert_default()
            .insert(TypeId::of::<M>(), prompt);
        self
    }

    /// Places the [`PromptLine`] above, as opposed to below
    pub fn above(self) -> Self {
        Self {
            specs: PushSpecs { side: Side::Above, ..self.specs },
            ..self
        }
    }

    /// Places the [`PromptLine`] below, this is the default
    pub fn below(self) -> Self {
        Self {
            specs: PushSpecs { side: Side::Below, ..self.specs },
            ..self
        }
    }

    /// Hides the [`PromptLine`] by default
    pub fn hidden(self) -> Self {
        Self {
            specs: PushSpecs { hidden: true, ..self.specs },
            ..self
        }
    }

    /// Requests the width when printing to the screen
    pub(crate) fn request_width(self) -> Self {
        Self { request_width: true, ..self }
    }
}