How do I convert variable names between snake_case, camelCase, and other naming conventions with vim-abolish?

Explanation

The vim-abolish plugin adds coercion operators that instantly convert the word under the cursor between common naming conventions. Place your cursor on any identifier and type cr followed by a letter to transform it — no visual selection or manual editing required.

How it works

• crs — convert to snake_case
• crc — convert to camelCase
• crm — convert to MixedCase (PascalCase)
• cru — convert to UPPER_SNAKE_CASE
• crk — convert to kebab-case
• crt — convert to Title Case
• crd — convert to dot.case

The conversion is smart: it understands word boundaries in all forms, so fooBar, foo_bar, FOO_BAR, and FooBar all correctly round-trip to any target format.

Example

With the cursor on getUserName:

getUserName

Press crs to get:

get_user_name

Press crm to get:

GetUserName

Press cru to get:

GET_USER_NAME

Tips

• Combine with . to repeat the same coercion on the next identifier after using n to jump to it
• Use :Subvert/identifier/replacement/g from the same plugin for multi-form substitutions across a file (it matches all case variants at once)
• Install via any plugin manager: tpope/vim-abolish