duat_utils/

lib.rs

//! Standard complementary additions to Duat
//!
//! This crate essentially consists of the standard bits that pretty
//! much every `config` crate will want to use, but aren't strictly
//! speaking necessary for Duat to function. This split is mostly to
//! improve compile times, but semantically, if a crate doesn't need
//! all of these extra things, it is nice to separate them out.
//!
//! The crate has the following elements:
//!
//! - 4 [`widgets`]:
//!   - [`LineNumbers`] shows the numbers on a [`File`] (for now), and
//!     you can configure their alignment, relativeness, etc.
//!   - The [`PromptLine`] lets you run commands and do other things,
//!     like incremental search
//!   - The [`StatusLine`] lets you display information that gets
//!     updated automatically, it can show information from
//!     [`RwData`]s, mapping functions, static elements, and every bit
//!     of Duat. It's syntax, in [`status!`] is the same as the
//!     [`txt!`] macro.
//!   - [`Notifications`] shows things that have been logged to the
//!     [`Logs`] of Duat, through the [`error!`], [`warn!`] and
//!     [`info!`] macros.
//!
//! - 2 [`modes`]:
//!   - [`Regular`] is essentially the standard [`Mode`] that text
//!     editors use. Sort of like VSCode.
//!   - [`Prompt`] is a multitool that can serve many purposes,
//!     through the [`PromptMode`] trait, which allows one to act on
//!     the [`PromptLine`] while abstracting over less important
//!     elements of the [`Widget`].
//!
//! - For the [`PromptLine`], there are 3 [`PromptMode`]s:
//!   - [`RunCommands`] will interpret and run Duat commands, with
//!     syntax highlighting for correctness, defined by the
//!     [`Parameter`] trait.
//!   - [`PipeSelections`] will pipe each selection on the current
//!     [`File`], replacing them with the return value from a shell
//!     command.
//!   - [`IncSearch`] is a specialized mode used for incremental
//!     search, which can abstract over what the search actually does
//!     with the [`IncSearcher`] trait.
//!
//! - For [`IncSearch`], there are 4 [`IncSearcher`]s:
//!   - [`SearchFwd`] will move each [`Cursor`] to the next match.
//!   - [`SearchRev`] will move each [`Cursor`] to the previous match.
//!   - [`ExtendFwd`] will extend each [`Cursor`]'s selections to the
//!     next match.
//!   - [`ExtendRev`] will extend each [`Cursor`]'s selections to the
//!     previous match.
//!
//! Note that the [`IncSearcher`] trait can be used for many more
//! interesting things, like in [`duat-kak`] for example, where its
//! implementors allow for splitting selections, selecting everything
//! within a range, and many more such things in the future.
//!
//! - There are also two [`hooks`]:
//!   - [`SearchUpdated`] for when an [`IncSearch`] is updated.
//!   - [`SearchPerformed`] for when an [`IncSearch`] is finished.
//!
//! And finally, there is the [`state`] module, which contains a bunch
//! of [`StatusLine`] parts for you to customize the [`StatusLine`]
//! with.
//!
//! I would consider this crate essential for all `config`s of Duat
//! out there, since it defines primitives that are not only hard to
//! replace, but might also be very extensible by plugins in the
//! ecosystem.
//!
//! [`LineNumbers`]: widgets::LineNumbers
//! [`File`]: duat_core::file::File
//! [`PromptLine`]: widgets::PromptLine
//! [`StatusLine`]: widgets::StatusLine
//! [`RwData`]: duat_core::data::RwData
//! [`status!`]: widgets::status
//! [`txt!`]: duat_core::text::txt
//! [`Notifications`]: widgets::Notifications
//! [`Logs`]: duat_core::context::Logs
//! [`error!`]: duat_core::context::error
//! [`warn!`]: duat_core::context::warn
//! [`info!`]: duat_core::context::info
//! [`Regular`]: modes::Regular
//! [`Mode`]: duat_core::mode::Mode
//! [`Prompt`]: modes::Prompt
//! [`PromptMode`]: modes::PromptMode
//! [`Widget`]: duat_core::ui::Widget
//! [`RunCommands`]: modes::RunCommands
//! [`Parameter`]: duat_core::cmd::Parameter
//! [`PipeSelections`]: modes::PipeSelections
//! [`IncSearch`]: modes::IncSearch
//! [`IncSearcher`]: modes::IncSearcher
//! [`SearchFwd`]: modes::SearchFwd
//! [`Cursor`]: duat_core::mode::Cursor
//! [`SearchRev`]: modes::SearchRev
//! [`ExtendFwd`]: modes::ExtendFwd
//! [`ExtendRev`]: modes::ExtendRev
//! [`duat-kak`]: https://docs.rs/duat-kak/latest/duat_kak
//! [`SearchUpdated`]: hooks::SearchUpdated
//! [`SearchPerformed`]: hooks::SearchPerformed
#![feature(
    decl_macro,
    closure_lifetime_binder,
    default_field_values,
    associated_type_defaults
)]

use duat_core::prelude::*;
use regex_syntax::ast::Ast;

pub mod modes;
pub mod state;
pub mod widgets;

pub mod hooks {
    //! Additional hooks for `duat-utils` specific things
    //!
    //! Right now, these are the two [`hook`]s available for use:
    //!
    //!   - [`SearchUpdated`] for when an [`IncSearch`] is updated.
    //!   - [`SearchPerformed`] for when an [`IncSearch`] is finished.
    //!
    //! More may come in the future
    //!
    //! [`hook`]: duat_core::hook
    //! [`IncSearch`]: crate::modes::IncSearch
    use duat_core::hook::Hookable;

    /// [`Hookable`]: Triggers when a [search] is updated
    ///
    /// Will not be triggered if the previous and current patterns are
    /// the same.
    ///
    /// # Arguments
    ///
    /// - The previous regex pattern
    /// - The current regex pattern
    ///
    /// [search]: crate::modes::IncSearch
    pub struct SearchUpdated(pub(crate) (String, String));

    impl Hookable for SearchUpdated {
        type Input<'h> = (&'h str, &'h str);

        fn get_input(&mut self) -> Self::Input<'_> {
            (&self.0.0, &self.0.1)
        }
    }

    /// [`Hookable`]: Triggers when a [search] is performed
    ///
    /// Will not be triggered on empty searches.
    ///
    /// # Arguments
    ///
    /// - The searched regex pattern
    ///
    /// [search]: crate::modes::IncSearch
    pub struct SearchPerformed(pub(crate) String);

    impl Hookable for SearchPerformed {
        type Input<'h> = &'h str;

        fn get_input(&mut self) -> Self::Input<'_> {
            &self.0
        }
    }
}

fn tag_from_ast(tagger: Tagger, text: &mut Text, ast: &Ast) {
    use duat_core::form::FormId;
    use regex_syntax::ast::{Ast::*, Span};

    let mut insert_form = |id: FormId, span: Span| {
        text.insert_tag(tagger, span.start.offset..span.end.offset, id.to_tag(0));
    };

    match ast {
        Empty(_) => {}
        Flags(set_flags) => {
            let id = form::id_of!("Regex.operator.flags");
            insert_form(id, set_flags.span);
        }
        Literal(literal) => {
            let id = form::id_of!("Regex.literal");
            insert_form(id, literal.span);
        }
        Dot(span) => {
            let id = form::id_of!("Regex.operator.dot");
            insert_form(id, **span);
        }
        Assertion(assertion) => {
            let id = form::id_of!("Regex.operator.assertion");
            insert_form(id, assertion.span);
        }
        ClassUnicode(class) => {
            let id = form::id_of!("Regex.class.unicode");
            insert_form(id, class.span);
        }
        ClassPerl(class) => {
            let id = form::id_of!("Regex.class.perl");
            insert_form(id, class.span);
        }
        ClassBracketed(class) => {
            let class_id = form::id_of!("Regex.class.bracketed");
            let bracket_id = form::id_of!("Regex.bracket.class");

            insert_form(class_id, *class.kind.span());

            let range = class.span.start.offset..class.span.start.offset + 1;
            text.insert_tag(tagger, range, bracket_id.to_tag(0));
            let range = class.span.end.offset - 1..class.span.end.offset;
            text.insert_tag(tagger, range, bracket_id.to_tag(0));
        }
        Repetition(repetition) => {
            let id = form::id_of!("Regex.operator.repetition");
            insert_form(id, repetition.op.span);
        }
        Group(group) => {
            let group_id = form::id_of!("Regex.group");
            let bracket_id = form::id_of!("Regex.bracket.group");

            insert_form(group_id, *group.ast.span());

            let range = group.span.start.offset..group.span.start.offset + 1;
            text.insert_tag(tagger, range, bracket_id.to_tag(0));
            let range = group.span.end.offset - 1..group.span.end.offset;
            text.insert_tag(tagger, range, bracket_id.to_tag(0));

            tag_from_ast(tagger, text, &group.ast);
        }
        Alternation(alternation) => {
            let id = form::id_of!("Regex.operator.alternation");

            let mut prev_end = None;

            for ast in alternation.asts.iter() {
                tag_from_ast(tagger, text, ast);

                if let Some(end) = prev_end {
                    let range = end..ast.span().start.offset;
                    text.insert_tag(tagger, range, id.to_tag(0));
                }

                prev_end = Some(ast.span().end.offset);
            }
        }
        Concat(concat) => {
            for ast in concat.asts.iter() {
                tag_from_ast(tagger, text, ast);
            }
        }
    }
}

mod private_exports {
    pub use duat_core;
    pub use format_like::format_like;

    pub macro parse_str($appender_checker:expr, $str:literal) {{
        use crate::{
            private_exports::duat_core::{context::FileHandle, data::Pass, text::Builder},
            widgets::State,
        };

        let (mut appender, checker) = $appender_checker;
        let (mut ap, _) = State::from($str).fns();

        let appender = move |pa: &Pass, builder: &mut Builder, reader: &FileHandle<_>| {
            appender(pa, builder, reader);
            ap(pa, builder, reader);
        };

        (appender, checker)
    }}

    pub macro parse_status_part {
        ($appender_checker:expr, "", $part:expr) => {{
            use crate::{
                private_exports::duat_core::{context::FileHandle, data::Pass, text::Builder},
                widgets::State,
            };

			#[allow(unused_mut)]
    		let (mut appender, checker) = $appender_checker;
            let (mut ap, ch) = State::from($part).fns();

            let checker = move || checker() || ch();

            let pre_fn = move |pa: &Pass, builder: &mut Builder, handle: &FileHandle<_>| {
                appender(pa, builder, handle);
                ap(pa, builder, handle);
            };

            (pre_fn, checker)
        }},
        ($appender_checker:expr, $modif:literal, $part:expr) => {{
            use crate::{
                private_exports::duat_core::{context::FileHandle, data::Pass, text::Builder},
                widgets::State,
            };

            let (mut appender, checker) = $appender_checker;
            let (mut ap, ch) =
                State::from(format!(concat!("{:", $modif, "}"), $part)).fns();

            let checker = move || checker() || ch();

            let appender = move |pa: &Pass, builder: &mut Builder, handle: &FileHandle<_>| {
                appender(pa, builder, handle);
                ap(pa, builder, handle);
            };

            (appender, checker)
        }}
    }

    pub macro parse_form {
        ($appender_checker:expr, "",) => {{
            use crate::{
                private_exports::duat_core::{context::FileHandle, data::Pass, form, text::Builder},
            };

            let (mut appender, checker) = $appender_checker;
            let appender = move |pa: &Pass, builder: &mut Builder, handle: &FileHandle<_>| {
                appender(pa, builder, handle);
                builder.push(form::DEFAULT_ID);
            };

            (appender, checker)
        }},
        ($appender_checker:expr, "", $($form:tt)*) => {{
            use crate::{
                private_exports::duat_core::{context::FileHandle, data::Pass, form, text::Builder},
            };

            let (mut appender, checker) = $appender_checker;
            let id = form::id_of!(concat!($(stringify!($form)),*));

            let appender = move |pa: &Pass, builder: &mut Builder, handle: &FileHandle<_>| {
                appender(pa, builder, handle);
                builder.push(id);
            };

            (appender, checker)
        }},
        ($pre_fn_and_checker:expr, $modif:literal, $($form:ident).*) => {{
            compile_error!(concat!("at the moment, Forms don't support modifiers like ", $modif))
        }}
    }
}