Code me a Jam!!

Question

On occasion I get a little blue and need a little music to cheer me up, but clicking the start button and finding my media player takes sooooooo long. I want a faster way to play a song.

The challenge:

Write a program that:

• Choose a song from my home directory (so you don’t mix-up program sound files with music) (this includes sub folders of the home directory).

• This song should be a random choice from all the media in my home folder. This doesn't need to be a perfect random, but I don't want to hear the same song multiple times. (unless that's my only song ;)

• To make it simple you should only look for files ending in .mp3.

• In the event that you find no music in my home dir, you should print Sorry Joe, no Jams! to stdout or closest equivalent (btw my name isn't Joe ;)

• The layout of my home folder will contain no infinite loops

• You should use system to play the song instead of using built in media playing APIs in your language (i.e. I want the song to play in the default player for my system).

• I should be able to place this file anywhere on my computer (e.g. my desktop or start folder)

• Your answer should work on windows, multi-platform is a (un-scored) bonus

This is code golf so the shortest program in bytes wins!!

Answer 1

PowerShell, 59 52 bytes

ii(ls -r./*.mp4|random);(,"Sorry Joe, no Jams!")[$?]

-7 byte golf improvements, thanks to Jaykul:

• Use ii (Invoke-Item) instead of saps
• No need to use Get- in Get-noun commandlet names, it will be searched by default.
• No space needed after -r

---

Previously at 59 bytes

saps(ls -R ~/*.mp3|Get-Random);(,"Sorry Joe, no Jams!")[$?]

It will throw an error if there are no files, but it will print the message too.

Explanation:

• saps is an alias for Start-Process
• ls is an alias for Get-ChildItem
• ~ maps to the home directory, and -R is -Recurse
• Get-Random selects a random item from the pipeline.
• After trying to launch it, it uses the previous command exit value as an index into a two-item array which either does nothing, or returns the apology message.

Answer 2

Dyalog APL, 78 75 73

{0::'Sorry Joe, no Jams!'⋄⎕SH⍵,{⍵⊃⍨?≢⍵}⎕SH∊'dir/b '⍵'*.mp3'}'%HOMEPATH%\'

Explanation:

{...} unnamed function, wherein ⍵ represents whatever is to the right of the }
APL statements (separated by ⋄) are executed leftmost first, but each statement is evaluated from right to left (no precedence rules), so each function gets whatever is to its right as argument
0:: sets a trap for all errors to return the string instead
∊'dir/b '⍵'*.mp3' makes the three strings into a single string
⎕SH passes its argument to cmd.exe
?≢⍵ random 1 ≤ integer ≤ count (or 0 < float < 1 if count is 0)
⍵⊃⍨ pick that element (floats are invalid indices, so an error is triggered here if count was 0)
⍵, prepends the home dir
⎕SH passes its argument to cmd.exe

Answer 3

Python 2, 178 bytes

import glob,os,random
try:os.startfile(random.choice([y for x in os.walk(os.getenv('HOMEPATH'))for y in glob.glob(os.path.join(x[0],'*.mp3'))]))
except:print"Sorry Joe, no Jams!"

Works on Windows, as per the spec.

Answer 4

Linux shell utilities, 74

Ok, so this one's not going to work on windows, but in case you decide to use a real OS (), here's what you could do in Linux:

find ~ -name \*.mp3|shuf|(read l&&xdg-open "$l"||echo Sorry Joe, no Jams!)