1 files changed, 17 insertions, 2 deletions

diff --git a/bin/edi/edi.h b/bin/edi/edi.h
index d8b1846b..62214e5d 100644
--- a/bin/edi/edi.h
+++ b/bin/edi/edi.h
@@ -17,11 +17,15 @@
 #include <stdlib.h>
 #include <wchar.h>
 
-static inline struct Span {
+struct Span {
 	size_t at, to;
-} spanNext(struct Span span, size_t len) {
+};
+static inline struct Span spanNext(struct Span span, size_t len) {
 	return (struct Span) { span.to, span.to + len };
 }
+static inline struct Span spanPrev(struct Span span, size_t len) {
+	return (struct Span) { span.at - len, span.at };
+}
 
 struct Slice {
 	const wchar_t *ptr;
@@ -55,6 +59,17 @@ struct Table tableInsert(const struct Table *prev, size_t at, struct Slice ins);
 struct Table tableDelete(const struct Table *prev, struct Span del);
 void tableUpdate(struct Table *table, struct Slice ins);
 
+struct Iter {
+	const struct Table *table;
+	struct Span span;
+	size_t slice;
+	size_t at;
+	wint_t ch;
+};
+struct Iter iter(const struct Table *table, size_t at);
+struct Iter iterNext(struct Iter it);
+struct Iter iterPrev(struct Iter it);
+
 struct Log {
 	size_t cap, len;
 	size_t state;