mercurial/bdiff.h

obsolete: avoid using revset language to compute the obsolete revset

This is part of a refactoring that moves some phase query optimization from
revset.py to phases.py. See previous patches for the motivation.

Now we have APIs in phasecache to get the non-public set efficiently, let's
use it directly instead of going through the "not public()" revset language
in "obsolete()" computation.

This patch was meaured using:

  for i in 'public()' 'not public()' 'draft()' 'not draft()'; do
      hg perfrevset "$i"; hg perfrevset "$i" --hidden;
  done

and no noticeable (> 1%) performance difference was observed.

#ifndef _HG_BDIFF_H_
#define _HG_BDIFF_H_

struct bdiff_line {
	int hash, n, e;
	ssize_t len;
	const char *l;
};

struct bdiff_hunk;
struct bdiff_hunk {
	int a1, a2, b1, b2;
	struct bdiff_hunk *next;
};

int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr);
int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn,
	struct bdiff_hunk *base);
void bdiff_freehunks(struct bdiff_hunk *l);

#endif