No way to add a package as a dependency of more than one other package?

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Danny Kumpf
Danny Kumpf 2020-12-1
I just want to confirm that this is really an issue with MATLAB, and not with me.
Let's say I have a package +pkg1 that is a dependency of two other packages: +pkg2, and +pkg3. And let's say that some functions in +pkg1 rely on other +pkg1 functions; that is, say we have +pkg1/fn1.m, and this function needs to call +pkg1/fn2.m. The problem is that once I place +pkg1 into the +pkg2 folder, I now need to go in and change how pkg1 calls its own internal functions! Whereas before, fn1.m had the line "pkg1.fn2()", now if I place +pkg1 into +pkg2, I need to change this line to "pkg2.pkg1.fn2()". And now if I want to place the same +pkg1 into +pkg3, I'm stuck. I would need to modify pkg1 independently for use in pkg2 and pkg3, which is ugly and sometimes impossible.
There is no built-in solution to this problem in MATLAB, correct? There is no way to add the same exact code (say, the same git branch of +pkg1) as a dependency of two different packages?
I have found a hacky solution that works under certain circumstances: Paste the following line to be the first line of every function within +pkg1 that calls another pkg1 function:
eval(sprintf('import %s.*', strjoin(regexp(mfilename('fullpath'), '(?<=+)\w*', 'match'), '.')));
This line:
  • Gets the full file path, eg C:\repos\+pkg2\+pkg1\fn1.m
  • Uses regexp to find all packages on the path, ie `+<pkg_name>` sub-strings
  • Joins the package names together with '.', eg: `pkg2.pkg1`
  • Uses `eval()` to call matlab's `import` statement: `import pkg2.pkg1.*`
After executing, you can call any functions that exist in pkg1 directly, without including the package names at all (eg, call just fn2()). This means that, from within a pkg1 function, you don't need to know whether pkg1 is a package, or whether it is a sub-package of any other package(s). This even works even if pkg1 itself is NOT a package, but instead is just added to the matlab path (because `import .*` does nothing). With this line added, you could add the exact same version of +pkg1 to both +pkg2 and +pkg3. But it's ugly, and doesn't always work - for example, if you have a classdef in +pkg1, and the property declarations call other functions in the class, I don't think there's any way to execute this import statement before you need to access those class functions.
Am I missing something that makes all this possible and easy?

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