A section called
textconv in the configuration file controls how file contents
are modified before being passed to diff.
textconv must contain an array of objects where each object has the
||string||Target path pattern to match|
||string||Command to transform contents|
||string||Extra arguments to command|
Files whose target path matches
pattern are transformed by passing them to the
standard input of
args, and new contents are read from the
command's standard output.
If a target path does not match any patterns then the file contents are passed
unchanged to diff. If a target path matches multiple patterns then element with
pattern is used.