Add :show command to display special symbols for whitespaces

Enable/disable by setting to 0/1 respectively:

 :set show spaces=0 tabs=0 newlines=1

1 files changed, 15 insertions, 0 deletions

diff --git a/syntax.h b/syntax.h
index 13fcb8c..c28a7ea 100644
--- a/syntax.h
+++ b/syntax.h
@@ -15,12 +15,27 @@ typedef struct {
 	regex_t regex;  /* compiled form of the above rule */
 } SyntaxRule;
 
+typedef struct {
+	char *symbol;
+	Color *color;
+} SyntaxSymbol;
+
+enum {
+	SYNTAX_SYMBOL_SPACE,
+	SYNTAX_SYMBOL_TAB,
+	SYNTAX_SYMBOL_TAB_FILL,
+	SYNTAX_SYMBOL_EOL,
+	SYNTAX_SYMBOL_EOF,
+	SYNTAX_SYMBOL_LAST,
+};
+
 typedef struct Syntax Syntax;
 struct Syntax {               /* a syntax definition */
 	char *name;           /* syntax name */
 	char *file;           /* apply to files matching this regex */
 	regex_t file_regex;   /* compiled file name regex */
 	const char **settings;/* settings associated with this file type */
+	SyntaxSymbol symbols[SYNTAX_SYMBOL_LAST]; /* symbols for white space handling */
 	SyntaxRule rules[24]; /* all rules for this file type */
 };