Enhanced sfxr for Love2D

sfxr.lua is a port of DrPetter's sfxr Flash tool to Lua and Love2D. 

It features both source code that enables you to play back sounds in your games and a demo app that is used to create sounds just like the original Flash tool.

I noticed some bugs in the demo app so set about fixing them:

• fix: getDirectoryItems (from a PR)
• fix: off by one sample length error (from a PR)
• fix: space bar was not playing the sound
• fix: selected wave form was being ignored (sounds were always square wave)
• fix: loaded wave form not updating the interface (but sound was playing correctly)

Then I got carried away and added some new features:

• add: clone method added to sfxr.lua
• add: history form with list of previous sounds, save current, and undo/redo
• add: “play on changes” so that any time you adjust a sound it plays automatically
• add: keyboard navigation in file picker (A–Z: jump to files, Enter: choose, Esc: close picker)
• add: window title reflects the most recent loaded/saved file
• add: window title and filename reflects last operation
• add: file selector shows data directory path
• add: unified save directory across platforms

I announced it on the Love2D forum and on my blog. 

Source code download is included here, until I have to time to add it to GitHub.

Keys

• SPACE = Generate and Play
• L = Load .lua
• O = Save .lua
• K = Load .sfs
• I = Save .sfs
• ESC = close/quit
• A–Z = skip to file in picker
• ENTER = choose selected file

Where my files at?

• macOS .app: ~/Library/Application Support/sfxr/sounds
• macOS .love: ~/Library/Application Support/LOVE/sfxr/sounds
  
• Windows .app:  %APPDATA%\sfxr\sounds
• Windows .love:  %APPDATA%\LOVE\sfxr\sounds

Credits

• sfxr.lua by nucular
• original sfxr by DrPetter