template: Process Directories and Files

[dave-tucker]

In order to properly allow for templates in directory names, we must
adjust the WalkDir to include both files and directories AND to yield
contents first.

Given that the project name is bar, and the directory tree:

| {{project-name}}/foo.rs
| {{projcet-name}}

• {{project-name}}/foo.rs is read and the contents rendered
• fs:create_dir_all will create the bar directory
• fs::write will write bar/foo.rs
• the {{project-name}} directory is then deleted with fs::remove_dir_all

Which will provide:

| bar/foo.rs

Fixes: #396

Command output from this commit:

🔧   Creating project called `foo`...
[ 1/12]   Done: .appveyor.yml
[ 2/12]   Done: .gitignore
[ 3/12]   Done: .travis.yml
[ 4/12]   Done: Cargo.toml
[ 5/12]   Done: LICENSE_APACHE
[ 6/12]   Done: LICENSE_MIT
[ 7/12]   Done: README.md
[ 8/12]   Done: src/lib.rs
[ 9/12]   Done: src/utils.rs
[10/12]   Done: src
[11/12]   Done: tests/web.rs
[12/12]   Done: tests
✨   Done! New project created /home/dave/dev/cargo-generate/foo

[sassman]

Suggested change

	.filter(|e| !is_git_metadata(e))
	.filter(|e| !is_git_metadata(e))
	.filter(|e| e.path() != project_dir)

[sassman]

this is the change for the last unnecessary substitution on the root level

[sassman]

thanks for your fix!

One odd side effect is that I can't figure out how to prune the root directory from the WalkDir:

Above you'll find a solution for the issue

[dave-tucker]

Thanks @sassman 🙏 I've incorporated your suggested fix and it works as expected!

[sassman]

Thanks a lot @dave-tucker