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/// Describes what the caller should do after an ex command runs.
///
/// Variants that mutate editor state (substitute, goto-line, clear-highlight)
/// are applied in-place inside the dispatcher; everything else is returned so
/// the host loop can act on it.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ExEffect {
/// Nothing happened (empty input or no-op effect).
None,
/// Save the current buffer to the current filename.
Save,
/// Save to a specific path (`:w <path>`). The caller updates its
/// `filename` field so future `:w` writes there.
SaveAs(String),
/// Quit (`:q`, `:q!`, `:wq`, `:x`).
Quit { force: bool, save: bool },
/// Unknown command — caller should surface as an error toast.
Unknown(String),
/// Substitution finished — report replacement count and lines changed.
Substituted { count: usize, lines_changed: usize },
/// A no-op response for successful commands that don't need a side
/// effect but should not be reported as unknown (e.g. `:noh`).
Ok,
/// Surface an informational message (single-line or unclassified multi-line).
Info(String),
/// Surface a titled multi-line listing (`:reg`, `:marks`, `:jumps`, `:changes`).
///
/// The `title` is a static label used by the host to open a named info
/// popup without brittle header-prefix string matching.
InfoTitled {
/// Short human-readable label for the popup window (e.g. `"registers"`).
title: &'static str,
/// Full body text, newline-separated.
content: String,
},
/// Surface an error message (syntax error, bad pattern, …).
Error(String),
/// `:e <path>` / `:edit <path>` — open a different file in the current
/// window. An empty `path` means reload the current buffer.
EditFile { path: String, force: bool },
/// `:bd[!]` / `:bw[!]` — close the current buffer.
/// `wipe = true` for `:bwipeout`; `force = true` when `!` was given.
BufferDelete { force: bool, wipe: bool },
/// `:put [{reg}]` / `:pu [{reg}]` — paste register contents as a new
/// line below (or above when `above = true`) the cursor.
PutRegister { reg: char, above: bool },
/// `:saveas {path}` / `:sav {path}` — write buffer to `path` AND rename
/// the buffer identity so future `:w` writes there.
/// Distinct from `SaveAs` (`:w <path>`) which writes elsewhere but keeps
/// the buffer's own filename unchanged.
SaveAndRename { path: String },
/// `:file {name}` — rename the current buffer in-memory without writing.
RenameBuffer { name: String },
/// `:cd [{path}]` — change the working directory. An empty path means
/// `$HOME`. The directory change is applied inside the handler; the new
/// path is surfaced so the host can update its status-line / title.
Cwd(String),
}