From f5ba357eac9d570a2b5f1373bdf33f0d34db122d Mon Sep 17 00:00:00 2001
From: Timothy Warren <twarren@nabancard.com>
Date: Tue, 20 Aug 2019 17:05:25 -0400
Subject: [PATCH] Highlight keywords

---
 kilo.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/kilo.c b/kilo.c
index c22c864..7bf97ff 100644
--- a/kilo.c
+++ b/kilo.c
@@ -41,6 +41,8 @@ enum editorKey {
 enum editorHighlight {
 	HL_NORMAL = 0,
 	HL_COMMENT,
+	HL_KEYWORD1,
+	HL_KEYWORD2,
 	HL_STRING,
 	HL_NUMBER,
 	HL_MATCH
@@ -54,6 +56,7 @@ enum editorHighlight {
 struct editorSyntax {
 	char *filetype;
 	char **filematch;
+	char **keywords;
 	char *singleline_comment_start;
 	int flags;
 };
@@ -88,11 +91,19 @@ struct editorConfig E;
 /*** filetypes ***/
 
 char *C_HL_extensions[] = { ".c", ".h", ".cpp", NULL };
+char *C_HL_keywords[] = {
+	"switch", "if", "while", "for", "break", "continue", "return", "else",
+	"struct", "union", "typedef", "static", "enum", "class", "case",
+
+	"int|", "long|", "double|", "float|", "char|", "unsigned|", "signed|",
+	"void|", NULL
+};
 
 struct editorSyntax HLDB[] = {
 	{
 		"c",
 		C_HL_extensions,
+		C_HL_keywords,
 		"//",
 		HL_HIGHLIGHT_NUMBERS | HL_HIGHLIGHT_STRINGS
 	},
@@ -303,6 +314,8 @@ void editorUpdateSyntax(erow *row)
 		return;
 	}
 
+	char **keywords = E.syntax->keywords;
+
 	char *scs = E.syntax->singleline_comment_start;
 	int scs_len = scs ? strlen(scs) : 0;
 
@@ -368,6 +381,33 @@ void editorUpdateSyntax(erow *row)
 			}
 		}
 
+		if (prev_sep)
+		{
+			int j;
+			for (j = 0; keywords[j]; j++)
+			{
+				int klen = strlen(keywords[j]);
+				int kw2 = keywords[j][klen -1] == '|';
+				if (kw2)
+				{
+					klen--;
+				}
+
+				if ( ! strncmp(&row->render[i], keywords[j], klen) &&
+					is_separator(row->render[i + klen]))
+				{
+					memset(&row->hl[i], kw2 ? HL_KEYWORD2 : HL_KEYWORD1, klen);
+					i += klen;
+					break;
+				}
+			}
+			if (keywords[j] != NULL)
+			{
+				prev_sep = 0;
+				continue;
+			}
+		}
+
 		prev_sep = is_separator(c);
 		i++;
 	}
@@ -380,6 +420,12 @@ int editorSyntaxToColor(int hl)
 		case HL_COMMENT:
 			return 36; // cyan
 
+		case HL_KEYWORD1:
+			return 33; // yellow
+
+		case HL_KEYWORD2:
+			return 32; // green
+
 		case HL_STRING:
 			return 35; // magenta