Mod postcss to accept directories as input while keeping the directory structure

[dotnetCarpenter]

change the css command in firefund-cli to accept a directory and pass all the files to postcss

Sub tasks:

• transpile one file to target directory
• directory to directory, file by file (retain structure)
• file and directory to directory, file by file (retain structure)
• directory and directory to directory, file by file (retain structure)
• directory to replace, throw "Not implemented by postcss"
• directory to file throw "Not implemented by postcss"
• file and directory to replace, throw "Not implemented by postcss"
• directory and directory to replace throw "Not implemented by postcss"
• file to replace, pass on to postcss
• file to directory pass on to postcss
• file to file, pass on to postcss
• file and file to replace, pass on to postcss
• file and file to directory, pass on to postcss but warn structure fuck up
• file and file to file, pass on to postcss (postscss will error)
• file and directory to file, pass on to postcss (postscss will error)
• directory and directory to file, pass on to postcss (postscss will error)

argument combinations to postcss

• --replace can be replaced with -r
• --dir can be replaced with -d
• --output can be replaced with -o

1. --replace inputFile [1]
2. --dir outputDir inputFile [1]
3. --output outputFile inputFile [1]
4. --replace inputDir [5]
5. --dir outputDir inputDir [2]
6. --output outputFile inputDir [3]
7. --replace inputFile inputFile ... [1]
8. --dir outputDir inputFile inputFile [1.1]
9. --output outputFile inputFile inputFile ... [1] - postscss will error
10. --replace inputFile inputDir ... [5]
11. --dir outputDir inputFile inputDir ... [2]
12. --output outputFile inputFile inputDir ... [1] - postscss will error
13. --replace inputDir inputDir [5]
14. --dir outputDir inputDir inputDir ... [2]
15. --output outputDir inputDir inputDir [1]- postscss will error
16. --output outputDir inputDir [4]
17. --output outputDir inputFile [4]
18. --dir outputFile intputDir [4]
19. --dir outputFile intputFile [4]

ACTIONS:

[1] - transpile files to output - direct pass on args to postcss
[1.1] direct pass on args to postcss - warn that folder structure is lost
[2] - recursively transpile all files in dir to output dir while retaining the dir structure
[3] - throw new Error("Can not transpile a directory to a file - yet")
[4] - throw new Error("output has to be a directory when input is a directory - did you mean to use --dir")
[5] - throw new Error("Not implemented by postcss-cli")