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convert: add round trip check based on 'core.checkRoundtripEncoding'

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UTF supports lossless conversion round tripping and conversions between
UTF and other encodings are mostly round trip safe as Unicode aims to be
a superset of all other character encodings. However, certain encodings
(e.g. SHIFT-JIS) are known to have round trip issues [1].

Add 'core.checkRoundtripEncoding', which contains a comma separated
list of encodings, to define for what encodings Git should check the
conversion round trip if they are used in the 'working-tree-encoding'
attribute.

Set SHIFT-JIS as default value for 'core.checkRoundtripEncoding'.

[1] https://support.microsoft.com/en-us/help/170559/prb-conversion-problem-between-shift-jis-and-unicode

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Lars Schneider
2018-04-15 20:16:10 +02:00
committed by Junio C Hamano
parent 541d059cd9
commit e92d622536
7 changed files with 137 additions and 0 deletions
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convert.h
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@@ -56,6 +56,7 @@ struct delayed_checkout {
};
extern enum eol core_eol;
extern char *check_roundtrip_encoding;
extern const char *get_cached_convert_stats_ascii(const struct index_state *istate,
const char *path);
extern const char *get_wt_convert_stats_ascii(const char *path);