skip unsupported package-managers (on macOS)

[samusz]

"Linux only" package-managers shouldn't be cheked for their presence on macOS.

This would speed up mpm use.

"Linux only" package-managers are: apt flatpack opkg and snap

[kdeldycke]

Good point. Skipping unsupported managers by default will speed things up.

Here is the result of my current private implementation. See how apt, flatpak, etc. are ignored by default:

$ mpm managers
┌────────────────────┬──────────┬───────────┬────────────────────────────┬────────────┬───────────┐
│ Package manager    │ ID       │ Supported │ CLI                        │ Executable │ Version   │
├────────────────────┼──────────┼───────────┼────────────────────────────┼────────────┼───────────┤
│ Atom's apm         │ apm      │ ✓         │ ✓  /usr/local/bin/apm      │ ✓          │ ✓  2.6.2  │
│ Homebrew Formulae  │ brew     │ ✓         │ ✓  /usr/local/bin/brew     │ ✓          │ ✓  3.2.13 │
│ Homebrew Cask      │ cask     │ ✓         │ ✓  /usr/local/bin/brew     │ ✓          │ ✓  3.2.13 │
│ PHP's Composer     │ composer │ ✓         │ ✓  /usr/local/bin/composer │ ✓          │ ✓  2.1.8  │
│ Ruby Gems          │ gem      │ ✓         │ ✓  /usr/bin/gem            │ ✓          │ ✓  3.0.3  │
│ Mac AppStore       │ mas      │ ✓         │ ✓  /usr/local/bin/mas      │ ✓          │ ✓  1.8.3  │
│ Node's npm         │ npm      │ ✓         │ ✓  /usr/local/bin/npm      │ ✓          │ ✓  7.24.0 │
│ Pip                │ pip      │ ✓         │ ✓  /usr/local/bin/python3  │ ✓          │ ✓  21.2.4 │
│ Visual Studio Code │ vscode   │ ✓         │ ✓  /usr/local/bin/code     │ ✓          │ ✓  1.60.2 │
│ Node's yarn        │ yarn     │ ✓         │ ✘  yarn not found          │            │           │
└────────────────────┴──────────┴───────────┴────────────────────────────┴────────────┴───────────┘

$ mpm -a managers
error:   The operation couldn’t be completed. Unable to locate a Java Runtime that supports apt.
error:   Please visit http://www.java.com for information on installing Java.
error: 
error:   The operation couldn’t be completed. Unable to locate a Java Runtime that supports apt.
error:   Please visit http://www.java.com for information on installing Java.
error: 
┌────────────────────┬──────────┬───────────────┬────────────────────────────┬────────────┬───────────┐
│ Package manager    │ ID       │ Supported     │ CLI                        │ Executable │ Version   │
├────────────────────┼──────────┼───────────────┼────────────────────────────┼────────────┼───────────┤
│ Atom's apm         │ apm      │ ✓             │ ✓  /usr/local/bin/apm      │ ✓          │ ✓  2.6.2  │
│ APT                │ apt      │ ✘  Linux only │ ✓  /usr/bin/apt            │ ✓          │ ✘         │
│ Linux Mint's apt   │ apt-mint │ ✘  Linux only │ ✓  /usr/bin/apt            │ ✓          │ ✘         │
│ Homebrew Formulae  │ brew     │ ✓             │ ✓  /usr/local/bin/brew     │ ✓          │ ✓  3.2.13 │
│ Homebrew Cask      │ cask     │ ✓             │ ✓  /usr/local/bin/brew     │ ✓          │ ✓  3.2.13 │
│ PHP's Composer     │ composer │ ✓             │ ✓  /usr/local/bin/composer │ ✓          │ ✓  2.1.8  │
│ Flatpak            │ flatpak  │ ✘  Linux only │ ✘  flatpak not found       │            │           │
│ Ruby Gems          │ gem      │ ✓             │ ✓  /usr/bin/gem            │ ✓          │ ✓  3.0.3  │
│ Mac AppStore       │ mas      │ ✓             │ ✓  /usr/local/bin/mas      │ ✓          │ ✓  1.8.3  │
│ Node's npm         │ npm      │ ✓             │ ✓  /usr/local/bin/npm      │ ✓          │ ✓  7.24.0 │
│ OPKG               │ opkg     │ ✘  Linux only │ ✘  opkg not found          │            │           │
│ Pip                │ pip      │ ✓             │ ✓  /usr/local/bin/python3  │ ✓          │ ✓  21.2.4 │
│ Snap               │ snap     │ ✘  Linux only │ ✘  snap not found          │            │           │
│ Visual Studio Code │ vscode   │ ✓             │ ✓  /usr/local/bin/code     │ ✓          │ ✓  1.60.2 │
│ Node's yarn        │ yarn     │ ✓             │ ✘  yarn not found          │            │           │
└────────────────────┴──────────┴───────────────┴────────────────────────────┴────────────┴───────────┘

I'll commit this upstream soon.

[github-actions[bot]]

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