vim-patch:9.1.1188: runtime(tera): tera support can be improved (#32799)

Problem:  runtime(tera): tera support can be improved
Solution: update tera filetype plugin, include a tera syntax script
          update the filetype test, update makemenu and synmenu vim scripts
          (MuntasirSZN)

closes: vim/vim#16830

vim/vim@14da0fb

1 files changed, 96 insertions, 0 deletions

diff --git a/runtime/syntax/tera.vim b/runtime/syntax/tera.vim
new file mode 100644
index 0000000000..922b9c9752
--- /dev/null
+++ b/runtime/syntax/tera.vim
@@ -0,0 +1,96 @@
+" Vim syntax file
+" Language:	Tera
+" Maintainer:	Muntasir Mahmud <muntasir.joypurhat@gmail.com>
+" Last Change:	2025 Mar 09
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Detect the underlying language based on filename pattern
+" For files like file.html.tera, we want to load html syntax
+let s:filename = expand("%:t")
+let s:dotpos = strridx(s:filename, '.', strridx(s:filename, '.tera') - 1)
+let s:underlying_filetype = ""
+
+if s:dotpos != -1
+  let s:underlying_ext = s:filename[s:dotpos+1:strridx(s:filename, '.tera')-1]
+  if s:underlying_ext != "" && s:underlying_ext != "tera"
+    let s:underlying_filetype = s:underlying_ext
+  endif
+endif
+
+" Load the underlying language syntax if detected
+if s:underlying_filetype != ""
+  execute "runtime! syntax/" . s:underlying_filetype . ".vim"
+  unlet! b:current_syntax
+else
+  " Default to HTML if no specific language detected
+  runtime! syntax/html.vim
+  unlet! b:current_syntax
+endif
+
+" Tera comment blocks: {# comment #}
+syn region teraCommentBlock start="{#" end="#}" contains=@Spell containedin=cssDefinition,cssStyle,htmlHead,htmlTitle
+
+" Tera statements: {% if condition %}
+syn region teraStatement start="{%" end="%}" contains=teraKeyword,teraString,teraNumber,teraFunction,teraBoolean,teraFilter,teraOperator containedin=cssDefinition,cssStyle,htmlHead,htmlTitle
+
+" Tera expressions: {{ variable }}
+syn region teraExpression start="{{" end="}}" contains=teraString,teraNumber,teraFunction,teraBoolean,teraFilter,teraOperator,teraIdentifier containedin=cssDefinition,cssStyle,htmlHead,htmlTitle
+
+" Special handling for raw blocks - content inside shouldn't be processed
+syn region teraRawBlock start="{% raw %}" end="{% endraw %}" contains=TOP,teraCommentBlock,teraStatement,teraExpression
+
+" Control structure keywords
+syn keyword teraKeyword contained if else elif endif for endfor in macro endmacro
+syn keyword teraKeyword contained block endblock extends include import set endset
+syn keyword teraKeyword contained break continue filter endfilter raw endraw with endwith
+
+" Identifiers - define before operators for correct priority
+syn match teraIdentifier contained "\<\w\+\>"
+
+" Operators used in expressions and statements
+syn match teraOperator contained "==\|!=\|>=\|<=\|>\|<\|+\|-\|*\|/"
+syn match teraOperator contained "{\@<!%}\@!" " Match % but not when part of {% or %}
+syn keyword teraOperator contained and or not is as
+
+" Functions and filters
+syn match teraFunction contained "\<\w\+\ze("
+syn match teraFilter contained "|\_s*\w\+"
+
+" String literals - both single and double quoted
+syn region teraString contained start=+"+ skip=+\\"+ end=+"+ contains=@Spell
+syn region teraString contained start=+'+ skip=+\\'+ end=+'+ contains=@Spell
+
+" Numeric literals - both integer and float
+syn match teraNumber contained "\<\d\+\>"
+syn match teraNumber contained "\<\d\+\.\d\+\>"
+
+" Boolean values
+syn keyword teraBoolean contained true false
+
+" Highlighting links
+hi def link teraCommentBlock Comment
+hi def link teraKeyword Statement
+hi def link teraOperator Operator
+hi def link teraFunction Function
+hi def link teraIdentifier Identifier
+hi def link teraString String
+hi def link teraNumber Number
+hi def link teraBoolean Boolean
+hi def link teraFilter PreProc
+
+" Special highlighting for blocks and expressions
+hi def link teraStatement PreProc
+hi def link teraExpression PreProc
+
+" Clean up script-local variables
+unlet s:filename
+unlet s:dotpos
+if exists("s:underlying_ext")
+  unlet s:underlying_ext
+endif
+unlet s:underlying_filetype
+
+let b:current_syntax = "tera"