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Specifies programs to run on the log message for each commit, based on
what's being committed. Each line consists of a regular expression
followed by a command template:
REGULAR_EXPRESSION PROGRAM [ARGUMENTS]
The PROGRAM is passed the log message on its standard input.
Several special codes are available for use in the arguments: %s
expands to the names of the files being committed, %V expands to
the old revisions from before the commit, and %v expands to the
new revisions after the commit. When there are multiple files involved,
each element of the expansion is separated from the others by
whitespace. For example, in a commit involving two files, %s
might expand into hello.c README.txt, and %v into
1.17 1.12.
You may combine codes inside curly braces, in which case, each unit of
expansion is internally separated by commas and externally separated
from the other units by whitespace. Continuing the previous example,
%{sv} expands into hello.c,1.17 README.txt,1.12.
If any % expansion is done at all, the expansion is prefixed by
the path to the project subdirectory (relative to the top of the
repository). So that last expansion would actually be:
myproj hello.c,1.17 README.txt,1.12
If PROGRAM exits with nonzero status, the commit fails; otherwise, it succeeds. (See also the Shared Syntax section in this chapter.)