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* convert: add round trip check based on 'core.checkRoundtripEncoding'Lars Schneider2018-04-161-0/+39
| | | | | | | | | | | | | | | | | | | 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>
* convert: add tracing for 'working-tree-encoding' attributeLars Schneider2018-04-161-0/+2
| | | | | | | | | Add the GIT_TRACE_WORKING_TREE_ENCODING environment variable to enable tracing for content that is reencoded with the 'working-tree-encoding' attribute. This is useful to debug encoding issues. Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* convert: check for detectable errors in UTF encodingsLars Schneider2018-04-161-0/+62
| | | | | | | | Check that new content is valid with respect to the user defined 'working-tree-encoding' attribute. Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* convert: add 'working-tree-encoding' attributeLars Schneider2018-04-161-0/+142
Git recognizes files encoded with ASCII or one of its supersets (e.g. UTF-8 or ISO-8859-1) as text files. All other encodings are usually interpreted as binary and consequently built-in Git text processing tools (e.g. 'git diff') as well as most Git web front ends do not visualize the content. Add an attribute to tell Git what encoding the user has defined for a given file. If the content is added to the index, then Git reencodes the content to a canonical UTF-8 representation. On checkout Git will reverse this operation. Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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