mercurial/mpatch.h

filemerge: support passing labels to external merge tools

This adds $labellocal, $labelother, and $labelbase to the replacement set for
merge-tools.<tool>.args config variables, and to the environment as HG_MY_LABEL,
HG_OTHER_LABEL, and HG_BASE_LABEL, respectively.

We also add merge-tools.<tool>.mergemarkers and
merge-tools.<tool>.mergemarkertemplate config variables as counterparts of
the variables available in [ui]. We are intentionally *not* respecting
ui.mergemarkers when calling out to external merge programs; too often the
default template will be too wide to display comfortably in most GUIs.

Differential Revision: https://phab.mercurial-scm.org/D2011

#ifndef _HG_MPATCH_H_
#define _HG_MPATCH_H_

#define MPATCH_ERR_NO_MEM -3
#define MPATCH_ERR_CANNOT_BE_DECODED -2
#define MPATCH_ERR_INVALID_PATCH -1

struct mpatch_frag {
	int start, end, len;
	const char *data;
};

struct mpatch_flist {
	struct mpatch_frag *base, *head, *tail;
};

int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res);
ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l);
void mpatch_lfree(struct mpatch_flist *a);
int mpatch_apply(char *buf, const char *orig, ssize_t len,
                 struct mpatch_flist *l);
struct mpatch_flist *
mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t),
            ssize_t start, ssize_t end);

#endif