1 files changed, 58 insertions, 0 deletions
diff --git a/examples/dte/indent.h b/examples/dte/indent.h
new file mode 100644
index 0000000..6198546
--- /dev/null
+++ b/examples/dte/indent.h
@@ -0,0 +1,58 @@
+#ifndef INDENT_H
+#define INDENT_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <string.h>
+#include <strings.h>
+#include "block-iter.h"
+#include "options.h"
+#include "util/debug.h"
+#include "util/macros.h"
+#include "util/string-view.h"
+
+typedef struct {
+    size_t bytes; // Size in bytes
+    size_t width; // Width in columns
+    size_t level; // Number of whole `indent-width` levels
+    bool wsonly; // Empty or whitespace-only line
+
+    // Only spaces or tabs, depending on `use_spaces_for_indent()`.
+    // Note that a "sane" line can contain spaces after tabs for alignment.
+    bool sane;
+} IndentInfo;
+
+// Divide `x` by `d`, to obtain the number of whole indent levels.
+// If `d` is a power of 2, shift right by `ffs(d) - 1` instead, to
+// avoid the expensive divide operation. This optimization applies
+// to widths of 1, 2, 4 and 8, which covers all of the sensible ones.
+static inline size_t indent_level(size_t x, size_t d)
+{
+    BUG_ON(d - 1 > 7);
+    return likely(IS_POWER_OF_2(d)) ? x >> (ffs(d) - 1) : x / d;
+}
+
+static inline size_t indent_remainder(size_t x, size_t m)
+{
+    BUG_ON(m - 1 > 7);
+    return likely(IS_POWER_OF_2(m)) ? x & (m - 1) : x % m;
+}
+
+static inline size_t next_indent_width(size_t x, size_t mul)
+{
+    BUG_ON(mul - 1 > 7);
+    if (likely(IS_POWER_OF_2(mul))) {
+        size_t mask = ~(mul - 1);
+        return (x & mask) + mul;
+    }
+    return ((x + mul) / mul) * mul;
+}
+
+char *make_indent(const LocalOptions *options, size_t width);
+char *get_indent_for_next_line(const LocalOptions *options, const StringView *line);
+IndentInfo get_indent_info(const LocalOptions *options, const StringView *line);
+size_t get_indent_width(const LocalOptions *options, const StringView *line);
+size_t get_indent_level_bytes_left(const LocalOptions *options, BlockIter *cursor);
+size_t get_indent_level_bytes_right(const LocalOptions *options, BlockIter *cursor);
+
+#endif