[feat][vfmt] Single-line short `if` expressions are incorrectly forced to multi-line

[Jengro777]

Describe the feature

When an if expression is short and fits comfortably on one line, v fmt still expands it into multiple lines:

// Input
if condition { 42 } else { 0 }

// Actual output after `v fmt`
if condition {
    42
} else {
    0
}

Use Case

// Before fmt (readable, compact)

status := if code == 200 { "OK" } else { "Error" }

// After fmt (verbose, less scannable)

status := if code == 200 {
    "OK"
} else {
    "Error"
}

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

V 0.5.1 99f141f

Environment details (OS name and version, etc.)

V full version	V 0.5.1 1b3385c.99f141f
OS	macos, macOS, 13.2.1, 22D68
Processor	8 cpus, 64bit, little endian, Intel(R) Core(TM) i5-8257U CPU @ 1.40GHz
Memory	0.31GB/8GB
V executable	/Applications/v/v
V last modified time	2026-04-19 01:29:00
V home dir	OK, value: /Applications/v
VMODULES	OK, value: /Users/avey/.vmodules
VTMP	OK, value: /tmp/v_501
Current working dir	OK, value: /Users/avey/Documents/Dev/RuoQi/RuoQi-v/temp
env LDFLAGS	"-L/usr/local/opt/openssl@3/lib"
Git version	git version 2.50.0
V git status	0.5.1-1018-g99f141f7
.git/config present	true
cc version	Apple clang version 14.0.3 (clang-1403.0.22.14.1)
gcc version	Apple clang version 14.0.3 (clang-1403.0.22.14.1)
clang version	Apple clang version 14.0.3 (clang-1403.0.22.14.1)
tcc version	tcc version 0.9.27 (x86_64 Darwin)
tcc git status	thirdparty-macos-amd64 975f1ad8
emcc version	N/A
glibc version	N/A

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[JalonSolov]

Same version of V here. I saved your code as x.v, and tried formatting...

$ vi x.v
$ v fmt -w x.v
Already formatted file: /home/jalon/x.v
$ cat x.v
x := if condition { 42 } else { 0 }
$

So it didn't change anything, for me. It left the code on one line.

[Jengro777]

Same version of V here. I saved your code as x.v, and tried formatting...

$ vi x.v
$ v fmt -w x.v
Already formatted file: /home/jalon/x.v
$ cat x.v
x := if condition { 42 } else { 0 }
$

So it didn't change anything, for me. It left the code on one line.

I'll give you a demo tomorrow.

[Jengro777]

import db.sqlite

@[table: 'dynamic_members']
struct DynamicMember {
mut:
	id     int @[primary; sql: serial]
	name   string
	email  string
	age    int
	status string
}

fn dynamic_select() ! {
	mut db := sqlite.connect(':memory:')!
	defer {
		db.close() or { panic(err) }
	}

	sql db {
		create table DynamicMember
	}!

	first := DynamicMember{
		name:   'Alice'
		email:  'alice@example.com'
		age:    31
		status: 'active'
	}

	sql db {
		insert first into DynamicMember
	}!

	name_filter := 'Alice'
	min_age := 20

	// vfmt off
	dynamic_where := {
				if name_filter != '' {name == name_filter},
				if min_age > 0 {age >= min_age}
		}
	// vfmt on
	rows := sql db {
		dynamic select from DynamicMember where dynamic_where order by id
	}!
	println(rows)
}

fn vfmt_if() {
	a := 10
	// vfmt off
	if a <= 10 {println('vfmt_0')}
	if a > 10 {println('vfmt_1')}
	// vfmt on
}

fn main() {
	dynamic_select()!
	vfmt_if()
}

Remove comments//vfmt off and//vfmt on and try vfmt-w x.v
@JalonSolov
If fmt forces line breaks in this comparative if statement, it will increase the vertical usage space of the screen and is not easy to read
It is more appropriate for us to wrap the line after exceeding a certain length