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Working with Properties

Encode/Decode/Roundtrip to/from a property file. Line comments on value nodes will be copied across.
By default, empty maps and arrays are not encoded - see below for an example on how to encode a value for these.

Encode properties

Note that empty arrays and maps are not encoded by default.
Given a sample.yml file of:
# block comments come through
person: # neither do comments on maps
name: Mike Wazowski # comments on values appear
pets:
- cat # comments on array values appear
food: [pizza] # comments on arrays do not
emptyArray: []
emptyMap: []
then
yq -o=props sample.yml
will output
# block comments come through
# comments on values appear
person.name = Mike Wazowski
# comments on array values appear
person.pets.0 = cat
person.food.0 = pizza

Encode properties: scalar encapsulation

Note that string values with blank characters in them are encapsulated with double quotes
Given a sample.yml file of:
# block comments come through
person: # neither do comments on maps
name: Mike Wazowski # comments on values appear
pets:
- cat # comments on array values appear
food: [pizza] # comments on arrays do not
emptyArray: []
emptyMap: []
then
yq -o=props --unwrapScalar=false sample.yml
will output
# block comments come through
# comments on values appear
person.name = "Mike Wazowski"
# comments on array values appear
person.pets.0 = cat
person.food.0 = pizza

Encode properties: no comments

Given a sample.yml file of:
# block comments come through
person: # neither do comments on maps
name: Mike Wazowski # comments on values appear
pets:
- cat # comments on array values appear
food: [pizza] # comments on arrays do not
emptyArray: []
emptyMap: []
then
yq -o=props '... comments = ""' sample.yml
will output
person.name = Mike Wazowski
person.pets.0 = cat
person.food.0 = pizza

Encode properties: include empty maps and arrays

Use a yq expression to set the empty maps and sequences to your desired value.
Given a sample.yml file of:
# block comments come through
person: # neither do comments on maps
name: Mike Wazowski # comments on values appear
pets:
- cat # comments on array values appear
food: [pizza] # comments on arrays do not
emptyArray: []
emptyMap: []
then
yq -o=props '(.. | select( (tag == "!!map" or tag =="!!seq") and length == 0)) = ""' sample.yml
will output
# block comments come through
# comments on values appear
person.name = Mike Wazowski
# comments on array values appear
person.pets.0 = cat
person.food.0 = pizza
emptyArray =
emptyMap =

Decode properties

Given a sample.properties file of:
# block comments come through
# comments on values appear
person.name = Mike Wazowski
# comments on array values appear
person.pets.0 = cat
person.food.0 = pizza
then
yq -p=props sample.properties
will output
person:
# block comments come through
# comments on values appear
name: Mike Wazowski
pets:
# comments on array values appear
- cat
food:
- pizza

Decode properties - array should be a map

If you have a numeric map key in your property files, use array_to_map to convert them to maps.
Given a sample.properties file of:
things.10 = mike
then
yq -p=props '.things |= array_to_map' sample.properties
will output
things:
10: mike

Roundtrip

Given a sample.properties file of:
# block comments come through
# comments on values appear
person.name = Mike Wazowski
# comments on array values appear
person.pets.0 = cat
person.food.0 = pizza
then
yq -p=props -o=props '.person.pets.0 = "dog"' sample.properties
will output
# block comments come through
# comments on values appear
person.name = Mike Wazowski
# comments on array values appear
person.pets.0 = dog
person.food.0 = pizza