duat_base/

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:
//!
//! - 6 [`widgets`]:
//!   - [`LineNumbers`] shows the numbers on a [`Buffer`] (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.
//!   - [`LogBook`] is a log of everything that has been notified to
//!     Duat. It is usually more admissive than `Notifications`, and
//!     is most commonly scrolled by the [`Pager`] [`Mode`].
//!   - [`Completions`] is Duat's completion widget, it provides a
//!     extensible completions list, which allows you to format the
//!     entries, and add new providers via the [`CompletionsProvider`]
//!     trait. Right now, the only `CompletionsProvider` is the words
//!     provider.
//!
//! - 3 [`modes`]:
//!   - [`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`.
//!   - [`Pager`] is a simple, read only `Mode`, designed for
//!     scrolling and searching through `Widget`s, most commonly the
//!     `LogBook`.
//!
//! - For the [`PromptLine`], there are 4 [`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
//!     `Buffer`, 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
//! [`Buffer`]: duat_core::buffer::Buffer
//! [`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
//! [`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
//! [`Pager`]: modes::Pager
//! [`LogBook`]: widgets::LogBook
//! [`Completions`]: widgets::Completions
//! [`CompletionsProvider`]: widgets::CompletionsProvider
#![feature(
    decl_macro,
    closure_lifetime_binder,
    default_field_values,
    associated_type_defaults,
    try_blocks,
    vec_try_remove
)]

use duat_core::{
    form,
    text::{Tagger, Text},
};
use regex_syntax::ast::Ast;

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

pub mod hooks {
    //! Additional hooks for `duat-base` 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;

    impl crate::widgets::StatusLineFmt {}

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

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

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

        (appender, checker)
    }}

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

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

            let checker = move |pa: &Pass| checker(pa) || ch(pa);

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

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

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

            let checker = move |pa: &Pass| checker(pa) || ch(pa);

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

            (appender, checker)
        }}
    }

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

            let (appender, checker) = $status_line;
            let appender = move |pa: &Pass, builder: &mut Builder, handle: &Handle| {
                appender(pa, builder, handle);
                builder.push(form::DEFAULT_ID);
            };

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

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

            let appender = move |pa: &Pass, builder: &mut Builder, handle: &Handle| {
                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 in StatusLines don't support modifiers like ",
                $modif
            ))
        }}
    }
}