# `Mob.Formatter`
[🔗](https://github.com/genericjam/mob/blob/master/lib/mob/formatter.ex#L1)

`mix format` plugin for the `~MOB` sigil.

Add `Mob.Formatter` to your project's `.formatter.exs` and `mix format` will
automatically normalise every `~MOB` sigil in your codebase alongside all other
Elixir code:

```elixir
# .formatter.exs
[
  plugins: [Mob.Formatter],
  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
]
```

## What it normalises

- **Consistent indentation** — children are indented 2 spaces per nesting level.
- **Attribute wrapping** — when a tag's inline attributes would exceed `line_length`,
  each attribute moves to its own line with the closing `/>` or `>` on a separate line.
- **Expression children** — `{expr}` slots are indented to match their sibling nodes.
- **Idempotent** — running `mix format` twice produces the same result.

See the [Tooling & Formatting guide](guides/tooling.html) for before/after examples
and CI setup instructions.

## Configuration

Respects the standard `line_length` option from `.formatter.exs`:

```elixir
[
  plugins: [Mob.Formatter],
  line_length: 120,
  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
]
```

The default line length is 98 characters.

## Pass-through behaviour

If the `~MOB` template cannot be parsed (e.g. the file is in a mid-edit incomplete
state), the formatter returns the content unchanged rather than raising. `mix format`
never breaks a file it cannot fully understand.

Mismatched open/close tag names (e.g. `<Column>...</Row>`) are silently corrected to
use the open tag name. The `~MOB` sigil itself raises a `CompileError` at compile
time for mismatched tags, so the formatted file will still surface the error on the
next `mix compile`.

---

*Consult [api-reference.md](api-reference.md) for complete listing*