how do I make a envvar-modifying alias - bash

Question

I run several Heroku apps from the same folder and I often need to target a specific one for a command I'm typing, through one of two environment variables
the options available to me are:
heroku command --app MYAPPID
heroku command -r MYAPPSGITREMOTEID
HEROKU_APP=MYAPPID heroku command
I currently use -r but it's difficult to build aliases with it, especially if I want to pipe the output of the heroku command to a different command... I can't call myalias -r myappid if the alias is heroku command | tail
I'd much prefer something like
#production heroku command that would evaluate to HEROKU_APP=MYPRODUCTIONID heroku command
bonus points if it'll work with chaining aliases, like #production myalias which would expand both the target app envvar alias and the command to be executed alias
any ideas?

Answer 1

This is where shell functions are the perfect solution:
myheroku () {
local heroku_app=$1
shift
env HEROKU_APP="$heroku_app" heroku "$#"
}
myalias1 () {
myheroku "$1" specific command here
}
myalias2 () {
myheroku "$1" some other command
}
# ...
Then
myalias1 #production
Will eventually invoke
env HEROKU_APP="#production" heroku specific command here