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The implementation of `git for-each-ref` is monolithic within
`cmd_for_each_ref()`, making it impossible to share its logic with other
commands. To enable code reuse for the upcoming `git refs list`
subcommand, refactor the core logic into a shared helper function.
Introduce a new `for-each-ref.h` header to define the public interface
for this shared logic. It contains the declaration for a new helper
function, `for_each_ref_core()`, and a macro for the common usage
options.
Move the option parsing, filtering, and formatting logic from
`cmd_for_each_ref()` into a new helper function named
`for_each_ref_core()`. This helper is made generic by accepting the
command's usage string as a parameter.
The original `cmd_for_each_ref()` is simplified to a thin wrapper that
is only responsible for defining its specific usage array and calling
the shared helper.
Mentored-by: Patrick Steinhardt <ps@pks.im>
Mentored-by: shejialuo <shejialuo@gmail.com>
Mentored-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Meet Soni <meetsoni3017@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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