progress: create helper class for incrementing progress When using ui.progress(), there's a clear pattern that is followed: * Pass the same topic and unit * Usually pass the same total * Call with pos=None to close the progress bar * Often keep track of the current position and increment it This patch creates a simple helper class for this. I'll probably make it implement the context manager protocol later (calling update(None) on __exit__). Progress is used in low-level modules like changegroup, so I also exposed it via a method on the ui object. Perhaps the class itself should also live in ui.py? This patch also makes merge.oy use it to show that it works. Differential Revision: https://phab.mercurial-scm.org/D3765

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#ifndef _HG_MPATCH_H_

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#define _HG_MPATCH_H_

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#define MPATCH_ERR_NO_MEM -3

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#define MPATCH_ERR_CANNOT_BE_DECODED -2

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#define MPATCH_ERR_INVALID_PATCH -1

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struct mpatch_frag {

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	int start, end, len;

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	const char *data;

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};

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struct mpatch_flist {

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	struct mpatch_frag *base, *head, *tail;

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};

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int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res);

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ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l);

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void mpatch_lfree(struct mpatch_flist *a);

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int mpatch_apply(char *buf, const char *orig, ssize_t len,

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                 struct mpatch_flist *l);

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struct mpatch_flist *

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mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t),

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            ssize_t start, ssize_t end);

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#endif