Add grapheme break properties when generating wcwidth data

tools/wcswidth/grapheme-segmentation-data.go

@@ -0,0 +1,66 @@
+package wcswidth
+
+
+type GraphemeBreakProperty uint8
+
+const (
+None = iota
+    Prepend
+    CR
+    LF
+    Control
+    Extend
+    Regional_Indicator
+    SpacingMark
+    L
+    V
+    T
+    LV
+    LVT
+    ZWJ
+)
+
+func GraphemeBreakPropertyFor(code rune) GraphemeBreakProperty {
+	switch code {
+		 // Prepend (28 codepoints {{{
+		 // }}}
+
+		 // CR (1 codepoints {{{
+		 // }}}
+
+		 // LF (1 codepoints {{{
+		 // }}}
+
+		 // Control (3893 codepoints {{{
+		 // }}}
+
+		 // Extend (2198 codepoints {{{
+		 // }}}
+
+		 // Regional_Indicator (26 codepoints {{{
+		 // }}}
+
+		 // SpacingMark (378 codepoints {{{
+		 // }}}
+
+		 // L (125 codepoints {{{
+		 // }}}
+
+		 // V (100 codepoints {{{
+		 // }}}
+
+		 // T (137 codepoints {{{
+		 // }}}
+
+		 // LV (399 codepoints {{{
+		 // }}}
+
+		 // LVT (10773 codepoints {{{
+		 // }}}
+
+		 // ZWJ (1 codepoints {{{
+		 // }}}
+
+	}
+	return None
+}