Feature/improve output

[arichardet]

Improve output, specifically errors/cascading errors due to an error in a dependency.

Changes:

• Do not draw nodes of dependency errors
• In the summary, list dependency errors if any
• Only sum the changes if the change does not have an associated error/dependency error

Fixes #367

[rebeccaskinner]

It might be more readable if this were broken up into multiple lines as long as that doesn't break anything.

[BrianHicks]

You can avoid newlines by putting a - before or after braces. {{- .}} would print the dot value and trim all whitespace characters before, {{. -}} would do the same but after. You do both, too. :)

[BrianHicks]

What does the output look like now? Does this need to update the docs with the new format?

[arichardet]

Output is unchanged if there are no errors or dependency errors. With this PR we draw the nodes that have changes, then once we encounter an error we draw that node; any nodes that depend on that failed node are not drawn (and are no longer counted as changes either).

Here is sample output of running samples/testdata/cert.hcl

Here we have only an error:

root/task.key:
 Messages:
  check (returned: 1)


 Has Changes: yes
 Changes: No changes

root/task.csr:
 Messages:
  check (returned: 1)


 Has Changes: yes
 Changes: No changes

root/task.crt:
 Error: exec: "blah": executable file not found in $PATH
 Messages:
 Has Changes: no
 Changes: No changes

root/task.directory:
 Messages:
  check (returned: 1)


 Has Changes: yes
 Changes: No changes

Errors:
 * root/task.crt: exec: "blah": executable file not found in $PATH

Summary: 1 errors, 3 changes

The next two are sample output with both errors and dependency errors:

root/task.directory:
 Error: exec: "blah": executable file not found in $PATH
 Messages:
 Has Changes: no
 Changes: No changes

Errors:
 * root/task.directory: exec: "blah": executable file not found in $PATH

Failed due to failing dependency:
 * root/task.key: error in dependency "root/task.directory"
 * root/task.csr: error in dependency "root/task.key"
 * root/task.crt: error in dependency "root/task.csr"

Summary: 1 errors, 0 changes, 3 dependency errors

root/task.csr:
 Error: exec: "blah": executable file not found in $PATH
 Messages:
 Has Changes: no
 Changes: No changes

root/task.key:
 Messages:
  check (returned: 1)


 Has Changes: yes
 Changes: No changes

root/task.directory:
 Messages:
  check (returned: 1)


 Has Changes: yes
 Changes: No changes

Errors:
 * root/task.csr: exec: "blah": executable file not found in $PATH

Failed due to failing dependency:
 * root/task.crt: error in dependency "root/task.csr"

Summary: 1 errors, 2 changes, 1 dependency errors