feat(syntax): \iffalse as comment

refer: #1988
lervag · May 30, 2021 · 549d80a · 549d80a
1 parent 79593ef
commit 549d80a
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diff --git a/autoload/vimtex/syntax/core.vim b/autoload/vimtex/syntax/core.vim
@@ -391,6 +391,14 @@ function! vimtex#syntax#core#init() abort " {{{1
         \ containedin=texComment contained
   syntax case match
 
+  " Highlight \iffalse ... \fi blocks as comments
+  syntax region texComment matchgroup=texCmd
+        \ start="^\s*\\iffalse\>" end="\\fi\>"
+        \ contains=texCommentConditionals
+  syntax region texCommentConditionals matchgroup=texComment
+        \ start="\\if\w\+" end="\\fi\>"
+        \ contained transparent
+
   " }}}2
   " {{{2 Zone: Verbatim
 

diff --git a/test/test-syntax/test-iffalse.tex b/test/test-syntax/test-iffalse.tex
@@ -0,0 +1,22 @@
+\documentclass{article}
+\usepackage[utf8]{inputenc}
+\usepackage{graphicx}
+
+\let\if@tempswa\iffalse
+\def\loop#1\repeat{\def\iterate{#1\relax\expandafter\iterate\fi}%
+  \iterate \let\iterate\relax}
+
+\begin{document}
+
+\iffalse
+Commented stuff
+Another \ifstuff here \fi
+\ifasd \fi \f \fii
+
+Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod
+tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At
+vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd
+gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
+\fi
+
+\end{document}