Toggle case operator

In vim, :set tildeop to get this behaviour

2 files changed, 6 insertions, 1 deletions

diff --git a/config.def.h b/config.def.h
index 9cd686a..832a975 100644
--- a/config.def.h
+++ b/config.def.h
@@ -217,6 +217,7 @@ static KeyBinding vis_operators[] = {
 	{ { NONE('>')               }, operator,      { .i = OP_SHIFT_RIGHT  } },
 	{ { NONE('<')               }, operator,      { .i = OP_SHIFT_LEFT   } },
 	{ { NONE('g'), NONE('U')    }, changecase,    { .i = +1              } },
+	{ { NONE('~')               }, changecase,    { .i =  0              } },
 	{ { NONE('g'), NONE('u')    }, changecase,    { .i = -1              } },
 	{ /* empty last element, array terminator */                           },
 };
diff --git a/vis.c b/vis.c
index c8531e4..f82ab89 100644
--- a/vis.c
+++ b/vis.c
@@ -616,7 +616,11 @@ static void op_case_change(OperatorContext *c) {
 	size_t rem = len;
 	for (char *cur = buf; rem > 0; cur++, rem--) {
 		if (isascii((unsigned char)*cur)) {
-			if (c->arg->i > 0)
+			if (c->arg->i == 0) {
+				*cur = islower((unsigned char)*cur) ?
+				       toupper((unsigned char)*cur) :
+				       tolower((unsigned char)*cur) ;
+			} else if (c->arg->i > 0)
 				*cur = toupper((unsigned char)*cur);
 			else
 				*cur = tolower((unsigned char)*cur);