Don't conceal “is” and “is not” (#15)

To make it possible to distinguish between `is`/`is not` and `==`/`!=`, the former pair will not be concealed.
ehamberg · Mar 3, 2012 · b1a39eb · b1a39eb
1 parent 39ad34e
commit b1a39eb
Show file tree

Hide file tree

Showing 2 changed files with 4 additions and 5 deletions.
diff --git a/after/syntax/python.vim b/after/syntax/python.vim
@@ -11,10 +11,9 @@ syntax match pythonOperator "\<is\>"
 syntax match pyNiceOperator "\<in\>" conceal cchar=∈
 syntax match pyNiceOperator "\<or\>" conceal cchar=∨
 syntax match pyNiceOperator "\<and\>" conceal cchar=∧
-" show “is not” as ≠
-syntax match pyNiceOperator "\<is not\>" conceal cchar=≠
-" include the space after “not” – if present – so that “not a” becomes “¬a”
-syntax match pyNiceOperator "\<not\%( \|\>\)" conceal cchar=¬
+" include the space after “not” – if present – so that “not a” becomes “¬a”.
+" also, don't hide “not” behind  ‘¬’ if it is after “is ”.
+syntax match pyNiceOperator "\%(is \)\@<!\<not\%( \|\>\)" conceal cchar=¬
 syntax match pyNiceOperator "\<not in\>" conceal cchar=∉
 syntax match pyNiceOperator "<=" conceal cchar=≤
 syntax match pyNiceOperator ">=" conceal cchar=≥

diff --git a/conceal-test.py b/conceal-test.py
@@ -1,7 +1,7 @@
 # conceal test -- lines should match
 
 """
-if a ≠ None: pass """
+if a is not None: pass """
 if a is not None: pass
 
 """