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diff: teach diff to read algorithm from diff driver

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It can be useful to specify diff algorithms per file type. For example,
one may want to use the minimal diff algorithm for .json files, another
for .c files, etc.

The diff machinery already checks attributes for a diff driver. Teach
the diff driver parser a new type "algorithm" to look for in the
config, which will be used if a driver has been specified through the
attributes.

Enforce precedence of the diff algorithm by favoring the command line
option, then looking at the driver attributes & config combination, then
finally the diff.algorithm config.

To enforce precedence order, use a new `ignore_driver_algorithm` member
during options parsing to indicate the diff algorithm was set via command
line args.

Signed-off-by: John Cai <johncai86@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
John Cai
2023-02-20 21:04:42 +00:00
committed by Junio C Hamano
parent 11e95e16e8
commit a4cf900ee7
6 changed files with 97 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
userdiff.c
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@ -293,7 +293,7 @@ PATTERNS("scheme",
"|([^][)(}{[ \t])+"),
PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
"\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
{ "default", NULL, -1, { NULL, 0 } },
{ "default", NULL, NULL, -1, { NULL, 0 } },
};
#undef PATTERNS
#undef IPATTERN
@ -393,6 +393,8 @@ int userdiff_config(const char *k, const char *v)
return parse_bool(&drv->textconv_want_cache, k, v);
if (!strcmp(type, "wordregex"))
return git_config_string(&drv->word_regex, k, v);
if (!strcmp(type, "algorithm"))
return git_config_string(&drv->algorithm, k, v);
return 0;
}