fix: assume no pkgs when dir is empty or does not exist

[lilyinstarlight]

Description

I have cargo installed but do not have any packages installed with cargo. Because it is installed, it does a check anyway for the number of files in ~/.cargo/bin/*, which does not exist for me and so is not expanded by bash and looks like one entry: a literal ~/.cargo/bin/* (which also happens if the directory exists but is empty)

This causes neofetch to erroneously report that I have 1 cargo package installed when there is none (see output below)

This PR fixes this by ensuring that the first element passed to the internal dir function exists before counting the number of arguments to get number of packages, and fixes both the case when the directory does not exist and fixes when the directory is empty

Output

Without Fix

No ~/.cargo/bin

lily@bina 
--------- 
OS: NixOS 23.05.20221229.677ed08 (Stoat) x86_64 
Host: Laptop (12th Gen Intel Core) A6 
Kernel: 6.1.1 
Uptime: 50 mins 
Packages: 5877 (nix-system), 625 (nix-user), 1 (cargo) 
Shell: fish 3.5.1 
Editor: vi NVIM v0.8.1 
Resolution: 2256x1504 
WM: sway 
Theme: Materia-Fooster [GTK2/3] 
Icons: Papirus-Dark [GTK2/3] 
Cursor: Bibata-Modern-Classic [GTK2/3] 
Terminal: alacritty 
CPU: 12th Gen Intel i7-1260P (16) @ 4.7GHz 
Memory: 3.29 GiB / 31.07 GiB (10%) 
Network: Wifi 

Empty ~/.cargo/bin

lily@bina 
--------- 
OS: NixOS 23.05.20221229.677ed08 (Stoat) x86_64 
Host: Laptop (12th Gen Intel Core) A6 
Kernel: 6.1.1 
Uptime: 50 mins 
Packages: 5877 (nix-system), 625 (nix-user), 1 (cargo) 
Shell: fish 3.5.1 
Editor: vi NVIM v0.8.1 
Resolution: 2256x1504 
WM: sway 
Theme: Materia-Fooster [GTK2/3] 
Icons: Papirus-Dark [GTK2/3] 
Cursor: Bibata-Modern-Classic [GTK2/3] 
Terminal: alacritty 
CPU: 12th Gen Intel i7-1260P (16) @ 4.7GHz 
Memory: 3.30 GiB / 31.07 GiB (10%) 
Network: Wifi 

One package installed to ~/.cargo/bin

lily@bina 
--------- 
OS: NixOS 23.05.20221229.677ed08 (Stoat) x86_64 
Host: Laptop (12th Gen Intel Core) A6 
Kernel: 6.1.1 
Uptime: 55 mins 
Packages: 5877 (nix-system), 625 (nix-user), 1 (cargo) 
Shell: fish 3.5.1 
Editor: vi NVIM v0.8.1 
Resolution: 2256x1504 
WM: sway 
Theme: Materia-Fooster [GTK2/3] 
Icons: Papirus-Dark [GTK2/3] 
Cursor: Bibata-Modern-Classic [GTK2/3] 
Terminal: alacritty 
CPU: 12th Gen Intel i7-1260P (16) @ 4.7GHz 
Memory: 3.30 GiB / 31.07 GiB (10%) 
Network: Wifi 

With Fix

No ~/.cargo/bin

lily@bina 
--------- 
OS: NixOS 23.05.20221229.677ed08 (Stoat) x86_64 
Host: Laptop (12th Gen Intel Core) A6 
Kernel: 6.1.1 
Uptime: 52 mins 
Packages: 5877 (nix-system), 625 (nix-user) 
Shell: fish 3.5.1 
Editor: vi NVIM v0.8.1 
Resolution: 2256x1504 
WM: sway 
Theme: Materia-Fooster [GTK2/3] 
Icons: Papirus-Dark [GTK2/3] 
Cursor: Bibata-Modern-Classic [GTK2/3] 
Terminal: alacritty 
CPU: 12th Gen Intel i7-1260P (16) @ 4.7GHz 
Memory: 3.25 GiB / 31.07 GiB (10%) 
Network: Wifi 

Empty ~/.cargo/bin

lily@bina 
--------- 
OS: NixOS 23.05.20221229.677ed08 (Stoat) x86_64 
Host: Laptop (12th Gen Intel Core) A6 
Kernel: 6.1.1 
Uptime: 52 mins 
Packages: 5877 (nix-system), 625 (nix-user) 
Shell: fish 3.5.1 
Editor: vi NVIM v0.8.1 
Resolution: 2256x1504 
WM: sway 
Theme: Materia-Fooster [GTK2/3] 
Icons: Papirus-Dark [GTK2/3] 
Cursor: Bibata-Modern-Classic [GTK2/3] 
Terminal: alacritty 
CPU: 12th Gen Intel i7-1260P (16) @ 4.7GHz 
Memory: 3.30 GiB / 31.07 GiB (10%) 
Network: Wifi 

One package installed to ~/.cargo/bin

lily@bina 
--------- 
OS: NixOS 23.05.20221229.677ed08 (Stoat) x86_64 
Host: Laptop (12th Gen Intel Core) A6 
Kernel: 6.1.1 
Uptime: 53 mins 
Packages: 5877 (nix-system), 625 (nix-user), 1 (cargo) 
Shell: fish 3.5.1 
Editor: vi NVIM v0.8.1 
Resolution: 2256x1504 
WM: sway 
Theme: Materia-Fooster [GTK2/3] 
Icons: Papirus-Dark [GTK2/3] 
Cursor: Bibata-Modern-Classic [GTK2/3] 
Terminal: alacritty 
CPU: 12th Gen Intel i7-1260P (16) @ 4.7GHz 
Memory: 3.23 GiB / 31.07 GiB (10%) 
Network: Wifi 

[hykilpikonna]

Merged, thank you!