Enum AutoWrap 

pub enum AutoWrap {
    Off,
    Comments,
    All,
}

:set autowrap=.... Whether inserting a character past textwidth breaks the line and carries the remainder down.

Why this exists as one named option

Vim has no toggle for this at all — it is formatoptions, a bag of nineteen single-letter flags of which t (wrap text) and c (wrap comments) are the two anyone means. That is why nobody remembers them. Emacs has auto-fill-mode, which names a 1980s implementation (“filling”) rather than the effect.

Why it is an option and not a minor mode

It owns no keymap, no lifecycle subscription, no decoration provider and no buffer — it is a behaviour flag consulted on the insert path, which is exactly what electricindent (IN.6) already is. Same seam, same per-major override mechanism via Mode::options(). A mode that is really a bool is a mode in name only.

Not to be confused with wrap

wrap is SOFT wrap — a display decision, no bytes change. This inserts real newlines. The two are orthogonal and compose: a buffer may soft-wrap at the window edge while hard-wrapping at textwidth.

Variants

Off

Never break a line while typing. gq still reflows on demand — textwidth remains the measure either way.

Comments

Break only inside comments, judged by the line’s leading comment marker. The default for code: a long comment wraps, a long string literal does not.

All

Break any line past textwidth. The default for prose majors — markdown, org, text, git commit messages.

Implementations

impl AutoWrap

pub fn label(self) -> &'static str

Canonical string label.

pub fn doc(self) -> &'static str

Short marginalia doc shown in cmdline-completion’s right-aligned column.

pub fn all() -> &'static [Self]

Variants in declaration order.

pub fn parse_label(s: &str) -> Result<Self, String>

Parse from canonical label or any registered alias.

Trait Implementations

impl Clone for AutoWrap

fn clone(&self) -> AutoWrap

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for AutoWrap

impl Debug for AutoWrap

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for AutoWrap

fn default() -> AutoWrap

Returns the “default value” for a type.

impl Eq for AutoWrap

impl PartialEq for AutoWrap

fn eq(&self, other: &AutoWrap) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for AutoWrap