[Bug 5102] New: Add a flag to make hg diff or hg status' exit codes reflect the presence of changes

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=5102

            Bug ID: 5102
           Summary: Add a flag to make hg diff or hg status' exit codes
                    reflect the presence of changes
           Product: Mercurial
           Version: 3.7.1
          Hardware: PC
                OS: Mac OS
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at selenic.com
          Reporter: lcharignon at fb.com
                CC: mercurial-devel at selenic.com

We could add a flag to hg status and hg diff to make them return with an exit
code similar to the diff command: 
- 0 when there are no changes
- 1 when changes are reported

This would make it slightly easier to use hg diff and hg status in scripts.

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