openidea/wit/views.wit

package openidea:plugin@1.0.0;

/// Declarative views: tool windows declared
/// under `[[contributes.views]]` and custom editors under
/// `[[contributes.customEditors]]`. The plugin describes what to show; the
/// IDE renders it with its own components (theme, keyboard, accessibility)
/// and sends the user's actions back as `view-event`s. Nothing of the plugin
/// runs in the WebView, except a `html` body, which is shown in a sandboxed
/// frame that can only exchange messages with the plugin.
interface view-types {
    use types.{extension};

    record button {
        id: string,
        label: string,
        /// An IDE icon name (`refresh`, `add`, `remove`, `run`, …).
        icon: option<string>,
        enabled: bool,
    }

    /// A tree node; `parent` is the key of an earlier item (none: a root).
    record tree-item {
        key: string,
        parent: option<string>,
        label: string,
        icon: option<string>,
        /// Grey text after the label.
        detail: option<string>,
        /// Shows an expander even before its children are known
        /// (`expand` asks for them).
        expandable: bool,
        expanded: bool,
    }

    record list-item {
        key: string,
        label: string,
        icon: option<string>,
        detail: option<string>,
    }

    variant field-value {
        text(string),
        multiline(string),
        checkbox(bool),
        /// The options and the chosen one.
        choice(tuple<list<string>, string>),
        /// A field type added after 1.0 (an IDE that doesn't know it leaves it out).
        other(extension),
    }

    record field {
        key: string,
        label: string,
        value: field-value,
    }

    /// Rows `first-row`..`first-row + len(rows)` of `total-rows`: the IDE
    /// asks for the rows it shows (`viewport`), so large tables stay cheap.
    record table {
        columns: list<string>,
        total-rows: u32,
        first-row: u32,
        rows: list<list<string>>,
        editable: bool,
    }

    variant body {
        /// A centred message (empty state, errors).
        message(string),
        tree(list<tree-item>),
        %list(list<list-item>),
        form(list<field>),
        table(table),
        /// HTML shown in a sandboxed frame: no scripts from elsewhere, no
        /// network, no IDE API. Its script talks to the plugin with
        /// `openidea.postMessage(text)` / `openidea.onMessage(fn)`.
        html(string),
        /// A body added after 1.0; an IDE that doesn't know it says it needs updating.
        other(extension),
    }

    record view {
        toolbar: list<button>,
        body: body,
        /// A line below the body (counts, last refresh…).
        status: option<string>,
    }

    /// The table rows the IDE shows.
    record viewport {
        first-row: u32,
        rows: u32,
    }

    record cell-edit {
        row: u32,
        column: u32,
        value: string,
    }

    variant view-event {
        /// A toolbar button.
        button(string),
        /// Double click / Enter on a tree or list item.
        activate(string),
        select(string),
        expand(string),
        collapse(string),
        /// A form field changed: key and new value (`true`/`false` for checkboxes).
        field(tuple<string, string>),
        cell(cell-edit),
        /// Insert an empty row before this one (the row count: append).
        insert-row(u32),
        delete-rows(list<u32>),
        /// From the `html` body's script.
        message(string),
        /// An event added after 1.0, from a body or field added after 1.0.
        other(extension),
    }
}

/// What a plugin's code can ask of its views.
interface views {
    use types.{error};

    /// The view (or every custom editor of that id) shows outdated content:
    /// the IDE renders it again.
    refresh: func(view: string);
    /// Sends a message to the script of a view's `html` body.
    post-message: func(view: string, message: string) -> result<_, error>;
    /// Opens a terminal tab in the window the call came from, running
    /// `program` (pinned by a `process:<program>` grant) with `args` in the
    /// project root: long-running output (logs) and interactive sessions.
    open-terminal: func(title: string, program: string, args: list<string>) -> result<_, error>;
}

/// The plugin's own settings (`[contributes.settings]`), as the user set them
/// (project over global) or the schema's default.
interface settings {
    /// The value of `key` as JSON (`true`, `3`, `"text"`), none if unknown.
    get: func(key: string) -> option<string>;
}

/// Optional export (world `plugin-views`): content of declared views and
/// custom editors. For a custom editor, `ctx.editor()` is its document.
interface view-provider {
    use view-types.{view, viewport, view-event};
    use invocation.{invocation};
    use types.{error};

    render: func(view: string, viewport: option<viewport>, ctx: borrow<invocation>) -> result<view, error>;
    handle: func(view: string, event: view-event, ctx: borrow<invocation>) -> result<_, error>;
}