[MacPorts] #35589: Add optional --patch parameter to `port install`

[MacPorts]

#35589: Add optional --patch parameter to `port install`
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 Reporter:  chocolate.camera@…          |       Owner:  macports-tickets@…                   
     Type:  request                     |      Status:  new                                  
 Priority:  Normal                      |   Milestone:                                       
Component:  base                        |     Version:  2.1.2                                
 Keywords:                              |        Port:                                       
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 Add an optional argument to the `install` command to apply a patch before
 compiling.

 Building custom versions of a port is a pain when it could perfectly be
 automated considering the procedure is always identical.[[BR]]


 1. Open the port's Portfile directory[[BR]]
 2. Create the `files` subdirectory[[BR]]
 3. Copy the patch into it[[BR]]
 4. Edit the `Portfile` file and add the `patchfiles` directive.[[BR]]
 5. Execute the command `port install portname`

 Most of 1-4 cannot be done with the Finder or most Cocoa editors since
 those actions require root (or sudo).

 It would nicer to be able to do it on 1 stroke at install time with a
 command-line argument:

         sudo port install portname --patch /path/to/myPatch

 Or is there a similar way that I am missing?

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Ticket URL: <https://trac.macports.org/ticket/35589>
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