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We want to use the same style of -L n,m argument for 'git log -L' as for git-blame. Refactor the argument parsing of the range arguments from builtin/blame.c to the (new) file that will hold the 'git log -L' logic. To accommodate different data structures in blame and log -L, the file contents are abstracted away; parse_range_arg takes a callback that it uses to get the contents of a line of the (notional) file. The new test is for a case that made me pause during debugging: the 'blame -L with invalid end' test was the only one that noticed an outright failure to parse the end *at all*. So make a more explicit test for that. Signed-off-by: Bo Yang <struggleyb.nku@gmail.com> Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
25 lines
811 B
C
25 lines
811 B
C
#ifndef LINE_RANGE_H
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#define LINE_RANGE_H
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/*
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* Parse one item in an -L begin,end option w.r.t. the notional file
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* object 'cb_data' consisting of 'lines' lines.
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*
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* The 'nth_line_cb' callback is used to determine the start of the
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* line 'lno' inside the 'cb_data'. The caller is expected to already
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* have a suitable map at hand to make this a constant-time lookup.
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*
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* Returns 0 in case of success and -1 if there was an error. The
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* actual range is stored in *begin and *end. The counting starts
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* at 1! In case of error, the caller should show usage message.
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*/
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typedef const char *(*nth_line_fn_t)(void *data, long lno);
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extern int parse_range_arg(const char *arg,
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nth_line_fn_t nth_line_cb,
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void *cb_data, long lines,
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long *begin, long *end);
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#endif /* LINE_RANGE_H */
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