#345 Conditionals for file creation

[ihostage]

Fixes #345
Inspired by lagom/lagom-java.g8#60

[eed3si9n]

@ihostage Thanks. I am actually not familiar with this area of the code, but our latest docs updated in #374 says:

These could also be used include/exclude files or directories:

src/main/g8
├── \$name__normalize\$
│   ├── \$if(jvm.truthy)\$jvm\$endif\$
│   │   └── src
│   │       └── main
│   │           └── scala
│   │               └── \$organization__packaged\$
│   │                   └── \$name;format="Camel"\$.scala

Is there a problem with that?
Also does this code change need and update of the doc?

[ihostage]

Hi, @eed3si9n 👋

Is there a problem with that?

Yep 😞We have a 2 problem now:

1. If I ignore a directory, how written in docs, G8 just skips this directory from the path to file. Nothing to more. All nested directory and files will be created. If I want to ignore a directory, I need to add conditions for all nested directories and pray, that I will see Skipping existing file: on the log because we have a second problem. 😄
2. Following from the first problem. G8 will crash If I try to ignore file (not a directory) and this file will be templating a first. For example, I have the next easy template:

src/main/g8
└── simple_folder
    ├── $if(condition.truthy)$ignored_file$endif$
    └── simple_file.txt

Expected result:

src/main/g8
└── simple_folder
    └── simple_file.txt

Actual result:

src/main/g8
└── simple_folder ← it's a file with the content of $if(condition.truthy)$ignored_file$endif$ 😱 

How it works:

1. Set condition=no
2. Process src/main/g8/simple_folder/$if(condition.truthy)$ignored_file$endif$
3. Evaluated path → src/main/g8/simple_folder
4. Create file src/main/g8/simple_folder with content of $if(condition.truthy)$ignored_file$endif$
5. Process src/main/g8/simple_folder/simple_file.txt
6. Evaluated path → src/main/g8/simple_folder/simple_file.txt
7. Create parent directory src/main/g8/simple_folder
8. Crash, because src/main/g8/simple_folder is a file, created on point 4.

Test, implemented on this PR, reproduce a two our problem. You can revert my changes of code and run test for seeing current behavior. 😉

Also does this code change need and update of the doc?

Nope 😄 On this PR the behavior of G8 that I expected after reading the docs. But you right, I updated PR and added some information about the case of skipping directory from the path.

[vpavkin]

For some reason I still see issues described by @ihostage, although I use 0.12.0 🤔