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I have Echo's buried in code all over my notebook, I'd like a flag to turn them all on or off globally.
Unprotect[Echo];Echo=Identity would disable them, but then you can't re-enable themQuietEcho doesn't work because I'd have to write it add it around every blob of code
Echo has an autoload, so you need to make sure the symbol is autoloaded before you modify its values:
DisableEcho[] := (Unprotect[Echo]; Echo; Echo = #&; Protect[Echo];)
EnableEcho[] := (Unprotect[Echo]; Echo=.; Protect[Echo];)
Test:
DisableEcho[]
Echo[3]
EnableEcho[]
Echo[3, "EchoLabel"]
3
EchoLabel 3
3
I would recommend using QuietEcho rather than redefining Echo:
In[62]:= $Pre = QuietEcho;
In[63]:= Echo[3]
Out[63]= 3
This has the added benefit of disabling printing for all Echo functions, not just Echo.
Echo=., no? $\endgroup$Echo = #&instead, sinceEchocan take multiple arguments. $\endgroup$Echo[withmyEchoin your code, then at the top assign an appropriate value tomyEcho, i.e.myEcho = Echovs.myEcho = Identitydepending on what you want. The global search should be relatively safe and painless, sinceEchois not a common keyword in other function names. This would also work with all othertypes of Echo, turning them intomyEcho...versions if you wanted. $\endgroup$Echobeing one of the autoloaded symbols. Check, e.g. on a fresh kernel, this:OwnValues[Echo], you will see something like{HoldPattern[Echo] :> System`Dump`AutoLoad[Hold[Echo], Hold[Echo, EchoFunction], "Language`Echo`"] /; System`Dump`TestLoad}. So, initially,EchohasOwnValues. When you executeEcho[0](actually, justEchois enough), you cause that definition to run. As a result,OwnValues[Echo]get cleared, insteadDownValues[Echo]get populated. When you doEcho = Identitywithout auto-load, you hopelessly overwrite autoload code. $\endgroup$