Add explanatory text:
```
This can result from latent connections but may represent a cyclic
variable dependency
```
Also, rather than messages such as:
```
Serverless Information ----------------------------------
##########################################################################################
Serverless Information ----------------------------------
# 0: 0 of 2 promises have settled
Serverless Information ----------------------------------
# 0: 2 unsettled promises:
Serverless Information ----------------------------------
# 0: foo waited on by: ${foo:}
Serverless Information ----------------------------------
# 0: foo waited on by: ${foo:}
Serverless Information ----------------------------------
##########################################################################################
```
Collate the message to read like:
```
Serverless Information ----------------------------------
##########################################################################################
# 0: 0 of 2 promises have settled
# 0: 2 unsettled promises:
# 0: foo waited on by: ${foo:}
# 0: foo waited on by: ${foo:}
# This can result from latent connections but may represent a cyclic
variable dependency
##########################################################################################
```
Fix `print`
The print command is highly linked to the `Variables` and `Service` codebases, keep those in sync and leave reminders about the link. Made these explicit and separately implemented to avoid complexity.
Additionally, the print command re-populates an object with the *very similar* content as the previously pre-populated service (just not augmented as just mentioned). This can lead to cross contamination between the two. As such, all caches must be cleared per unique invocation of service/object/property population.
Add tests for some expected but previously unverified behaviors.
Clean pre-population
The previous implementation worked okay but was unnecessary and would have been a maintenance problem. Instead, just knock out the population of variables depending on those config dependent services and use the standard means of resolution.
Fix cyclic bug (resulting from running print against a self-referencing serverless.yml)
The caching of values could lead to a cyclic object remaining in the caches for variable population. This causes crashes and pain. Solved by the cache cleaning logic.
#4311
see prepopulateService - attempts to pre-populate the region and stage settings necessary for making a request to AWS, rejecting and dependencies thereon it runs into during that process
see the `deep` variable work. this was a knock-on effect of providing pre-population. it actually represents an obscure class of bugs where the recursive population previously in getDeepValue caused the caller not to be in charge of population choices (thus fixing for pre-population) but also caused potential deadlocks resulting from getDeepValue creating circular dependencies.
#4734
see splitByComma - a regex to do the splitting but ignore quoted commas was getting very deep and involved. Instead, identify quoted string boundaries, then identify commas (including white space around them) and take those commas not contained by quotes as the locations for splitting the given string. Trim the string as well (removing leading and trailing white space).
add sophistication to the overwrite syntax, allowing for whitespace and repetitions (for robustness)
add sophistication to the string ref syntax, allowing for use in identifying multiple quoted strings in a variable (i.e. for overwrites)
#NotCreated
fix a bug I created earlier in the branch that caused reporting to be less informative (see renderMatches)
separate PromiseTracker
move this class into its own file for the purpose of increasing testability and offering reuse
minutiae
filter the properties given to populateVariables so as to avoid attempting resolution on non-variables. Efficiency and noise reduction change. Also cleans up the code (e.g. see populateObject and its use)
cleaning of overwrite as a side effect
offer variable cleaning as a idiom
reorder the Variables.js `require`s to be in alphabetical order
