Add Vim syntax highlighting

editor-support/vim/README.md

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+# Vim support for `str`
+
+This directory provides Vim syntax highlighting and filetype detection for the `str` string manipulation language.
+
+## Installation
+
+### Manual Installation
+Copy the `ftdetect` and `syntax` directories into your Vim or Neovim configuration directory.
+
+**For Vim:**
+```bash
+cp -r editor-support/vim/ftdetect ~/.vim/
+cp -r editor-support/vim/syntax ~/.vim/
+```
+
+**For Neovim:**
+```bash
+cp -r editor-support/vim/ftdetect ~/.config/nvim/
+cp -r editor-support/vim/syntax ~/.config/nvim/
+```

editor-support/vim/ftdetect/str.vim

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+au BufRead,BufNewFile *.str,.str.rc set filetype=str

editor-support/vim/syntax/str.vim

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+" Vim syntax file
+" Language: str (Interactive string manipulation environment)
+" Maintainer: Garrett Mills <shout@garrettmills.dev>
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Keywords (commands)
+syn keyword strKeyword exit paste copy infile outfile assign clear show undo redo history edit save load runfile script
+syn keyword strKeyword enclose lower upper lsub rsub prefix suffix quote unquote replace rev trim indent concat
+syn keyword strKeyword line word each on drop take missing lines words split chunk join sort unique zip
+syn match strKeyword "\<contains\>"
+syn keyword strKeyword to from set over call lipsum
+
+" Types
+syn match strType "::\s*\zs\(string\|int\|destructured\)"
+
+" Variables
+syn match strVariable "\$\w\+"
+
+" Operators
+syn match strOperator "="
+syn match strOperator ";"
+syn match strOperator "::"
+
+" Delimiters
+syn match strDelimiter "[()|]"
+
+" Strings
+syn region strString start="'" end="'" skip="\\'"
+
+" Comments
+syn match strComment "--.*$"
+
+" Default highlighting
+hi def link strKeyword   Keyword
+hi def link strType      Type
+hi def link strVariable  Identifier
+hi def link strOperator  Operator
+hi def link strDelimiter Delimiter
+hi def link strString    String
+hi def link strComment   Comment
+
+let b:current_syntax = "str"