Make Treesitter optional for vim support

Still support vim.
Therefore make Treesitter adjustments depending on neovim.

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## v1.7.1 2024-10-04
+
+### Fixed
+
+- Keep compatibility with vim, which does not have Treesitter
+
 ## v1.7.0 2024-05-21
 
 ### Added

colors/smyckblue.vim

@@ -77,6 +77,8 @@ hi link Number String
 hi Error          cterm=none ctermbg=none ctermfg=red
 hi Todo           cterm=none ctermbg=none ctermfg=yellow
 
+if has('nvim')
+
     " Treesitter
     hi @namespace cterm=none ctermbg=none ctermfg=white
     hi @type cterm=none ctermbg=none ctermfg=blue
@@ -140,10 +142,14 @@ hi @markup.heading.6.markdown cterm=none ctermbg=none ctermfg=blue
     hi link @keyword.operator.sql @type.builtin
     hi link @keyword.sql @type.builtin
 
+endif
+
 " XML Treesitter
 hi link xmlTag Identifier
 hi link xmlTagName Identifier
 
+if has('nvim')
+
     " PHPDoc Treesitter (Keep everything as comment)
     hi link @type.phpdoc @comment
     hi link @attribute.phpdoc @comment
@@ -156,6 +162,8 @@ hi link @text.uri.phpdoc @comment
     " JSON Treesitter
     hi link @label.json @string
 
+endif
+
 " Diff
 hi DiffAdd              cterm=bold ctermbg=2        ctermfg=15
 hi DiffChange           cterm=bold ctermbg=4        ctermfg=15