Upgrade to Lua 5.5

[kbd]

I updated Homebrew for the first time in a while and my Hammerspoon config broke. My Hammerspoon config is written in Fennel. Turns out Lua is 5.5 now, and the Homebrew installer for Fennel installs in the luajit version (5.1) and the current version (5.5) but not Homebrew's version (5.4).

$ hs
> require("fennel")
...poon.app/Contents/Resources/extensions/hs/_coresetup.lua:662: module 'fennel' not found:
	no field package.preload['fennel']
	no file '/Users/kbd/.hammerspoon/fennel.lua'
	no file '/Users/kbd/.hammerspoon/fennel/init.lua'
	no file '/Users/kbd/.hammerspoon/Spoons/fennel.spoon/init.lua'
	no file '/opt/homebrew/share/lua/5.4/fennel.lua'
	no file '/opt/homebrew/share/lua/5.4/fennel/init.lua'
	no file '/opt/homebrew/lib/lua/5.4/fennel.lua'
	no file '/opt/homebrew/lib/lua/5.4/fennel/init.lua'
	no file '/usr/local/share/lua/5.4/fennel.lua'
	no file '/usr/local/share/lua/5.4/fennel/init.lua'
	no file '/usr/local/lib/lua/5.4/fennel.lua'
	no file '/usr/local/lib/lua/5.4/fennel/init.lua'
	no file './fennel.lua'
	no file './fennel/init.lua'
	no file '/Applications/Hammerspoon.app/Contents/Resources/extensions/fennel.lua'
	no file '/Applications/Hammerspoon.app/Contents/Resources/extensions/fennel/init.lua'
	no file '/Users/kbd/.local/share/hammerspoon/site/fennel.lua'
	no file '/Users/kbd/.local/share/hammerspoon/site/fennel/init.lua'
	no file '/Users/kbd/.local/share/hammerspoon/site/Spoons/fennel.spoon/init.lua'
	no file '/Users/kbd/.hammerspoon/fennel.dylib'
	no file '/Users/kbd/.hammerspoon/fennel.so'
	no file '/opt/homebrew/lib/lua/5.4/fennel.so'
	no file '/opt/homebrew/lib/lua/5.4/loadall.so'
	no file '/usr/local/lib/lua/5.4/fennel.so'
	no file '/usr/local/lib/lua/5.4/loadall.so'
	no file './fennel.so'
	no file '/Applications/Hammerspoon.app/Contents/Frameworks/fennel.dylib'
	no file '/Users/kbd/.local/share/hammerspoon/site/lib/fennel.dylib'
	no file '/Users/kbd/.local/share/hammerspoon/site/lib/fennel.so'

Contents of homebrew/share/lua:

/opt/homebrew/share/lua$ eza -alT
drwxr-xr-x@ - kbd 16 Apr 13:51 .
drwxr-xr-x@ - kbd 16 Apr 16:33 ├── 5.1
lrwxr-xr-x@ - kbd 16 Apr 16:33 │   ├── fennel.lua -> ../../../Cellar/fennel/1.6.1_1/share/lua/5.1/fennel.lua
lrwxr-xr-x@ - kbd 16 Apr 13:51 │   └── re.lua -> ../../../Cellar/lpeg/1.1.0_2/share/lua/5.1/re.lua
drwxr-xr-x@ - kbd 16 Apr 13:51 ├── 5.4
lrwxr-xr-x@ - kbd 16 Apr 13:51 │   └── re.lua -> ../../../Cellar/lpeg/1.1.0_2/share/lua/5.4/re.lua
drwxr-xr-x@ - kbd 16 Apr 16:33 └── 5.5
lrwxr-xr-x@ - kbd 16 Apr 16:33     ├── fennel.lua -> ../../../Cellar/fennel/1.6.1_1/share/lua/5.5/fennel.lua
lrwxr-xr-x@ - kbd 16 Apr 13:51     └── re.lua -> ../../../Cellar/lpeg/1.1.0_2/share/lua/5.5/re.lua

For now I've symlinked the 5.5 fennel.lua into .hammerspoon:

~/.hammerspoon$ ln -s /opt/homebrew/share/lua/5.5/fennel.lua fennel.lua

In the future I could switch to luarocks to install fennel, which afaik lets you install for specific versions. Figured it was worth opening this ticket to track 5.5 status (as there was a ticket for 5.4).

[aoimizuno]

Hello, nice to meet you.
I think this can solved without version change.
Could I do this?
Is it still working?

[kbd]

Is it still working?

It works fine with the added symlink. My point is that if one installs latest Homebrew versions of everything now they get Lua 5.5, Fennel that installs into 5.1 + latest (now 5.5), and Hammerspoon that uses Lua 5.4. So, I think things are currently "broken by default" on new installs for people who use Fennel with Hammerspoon.

[aoimizuno]

I came across this and had a quick idea:
What if we ensure Fennel is installed for Lua 5.4 (Homebrew’s version used by Hammerspoon), or adjust the package path so Hammerspoon can resolve the existing install instead of relying on manual symlinks?

[kbd]

What if we ensure Fennel is installed for Lua 5.4

I mentioned potentially installing Fennel with luarocks instead, which afaik lets you install for a specific version, but Homebrew doesn't allow that.

adjust the package path so Hammerspoon can resolve the existing install instead of relying on manual symlinks?

I suppose I can modify the search path in the code? Adding a symlink on install seems easier.

[aoimizuno]

Yeah, i want to discuss about that deeply.
But, it's difficult to here.
Could we chat the other paltform?

[kbd]

I don't have any other platforms to chat on. I don't know why this is "difficult to discuss" in issues. For now I am solving this by adding the symlink to my post-install steps after installing Hammerspoon and Fennel.