Differentiate minor mode and global minor mode

[Joost Kremers]

Hi list,

I was wondering if there's a proper way to determine if a minor 
mode is being turned on locally or globally?

Specifically, I'm running into an issue with my package 
`writeroom-mode`, which defines a minor mode (activated with 
`writeroom-mode`) and a globalized version 
(`global-writeroom-mode`). The globalized mode is defined with 
`define-globalized-minor-mode`, so `global-writeroom-mode` calls a 
function `turn-on-writeroom-mode`, which in turn calls 
`writeroom-mode`. In the body of `writeroom-mode`,[1] I want to be 
able to be able to distinguish whether `writeroom-mode` is turned 
on locally in a buffer or globally.

Obviously, I could just set some global variable in 
`turn-on-writeroom-mode` to signal to `writeroom-mode`[2] that the 
mode is turned on globally,[3] but perhaps there's a canonical way 
of doing this that I'm not aware of?

TIA

Joost



Footnotes:
[1]  The minor mode is defined with `define-minor-mode`, so 
`writeroom-mode` is generated. `define-minor-mode` just calls a 
function `writeroom--enable`, so I really want to distinguish 
between a local and global use of `writeroom-mode` in this 
function.

[2]  Specifically, `writeroom--enable`.

[3]  Alternatively, I guess I could call `writeroom--enable` 
directly in `turn-on-writeroom-mode` and pass an argument.

--
Joost Kremers
Life has its moments