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runtime(rust): Do not use rustfmt as 'formatprg' by default

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This reverts commit 4ac995bf93.

This was added in #16807, with no explanation for why it was necessary beyond
"it's an example of an idea". It completely breaks `gq` for me—rustfmt doesn't
reflow comments so is not an appropriate tool here! Beyond that, formatting a
selection with rustfmt treats that selection as if it were an entire file,
throwing away any indentation.

For example, the commit causes `gq` to turn this:

```rust
pub fn foo() {
    // blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
}
```

into this:

```rust
pub fn foo() {
// blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
}

```

which is totally wrong. In contrast, if I clear `formatprg` then `gq` does the
right thing again:

```rust
pub fn foo() {
    // blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
    // blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
    // blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
    // blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
    // blah blah blah blah blah blah
}
```

related: #16967
related: #17055
closes: #18640

Signed-off-by: Aaron Jacobs <jacobsa@google.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Aaron Jacobs
2025-10-27 17:46:11 +00:00
committed by Christian Brabandt
parent 7d3b647f88
commit eba51337d4
3 changed files with 6 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
runtime/doc/ft_rust.txt
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@@ -166,13 +166,6 @@ g:rustfmt_detect_version~
Disabled by default for performance reasons
>
let g:rustfmt_detect_version = 1
<
*g:rustfmt_find_toml*
g:rustfmt_emit_files~
When set to 1, will try to find "rustfmt.toml" file by searching from
current path upwards. Disabled by default for performance reasons
>
let g:rustfmt_find_toml = 1
<
*g:rust_playpen_url*
g:rust_playpen_url~