nano syntax highlighting for yaml

yaml.nanorc

## Nano syntax highlighting for YAML files
##
## Author:      Leo Arnold  
## Modified by: Eirik Oeverby
## License:     Public Domain
## URL:         https://gist.github.com/leoarnold/96272e33753aff09163cf18ad641f028

syntax "yaml" "\.(yml|yaml)$"
   
## Keys
#icolor green "^[[:space:]]*(- )?[.0-9A-Z_/-]+:( |$)"
icolor white "^[[:space:]]*[.0-9a-zA-Z_/-:]+:( |$)"
color green "(::)"
color brightwhite "[.0-9a-zA-Z_/-]+:( |$)"
## Structurals
color brightred "(^---|^[[:space:]]*- |: |:$)"
   
## Strings, double-quoted
color brightgreen ""([^"]|(\\"))*""
color brightgreen "\$(\w+|\{\w+\})"
## Strings, single-quoted
color green "'([^']|(\\'))*'" 

## Variables
color yellow "%\{.*?\}"
   
## Functions
color brightyellow "(%\{.*?\(|\).*?\})"

## Comments
color cyan "(^|[[:space:]]+)#.*$"
## Some common markers
color brightcyan "(TODO|FIXME|\?\?\?)"
## Trailing spaces
color ,red "[[:space:]]+$"