diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/todo/RevertableProperty_with_NoInfo.mdwn | 29 | ||||
| -rw-r--r-- | doc/todo/info_propigation_out_of_nested_properties.mdwn | 2 |
2 files changed, 31 insertions, 0 deletions
diff --git a/doc/todo/RevertableProperty_with_NoInfo.mdwn b/doc/todo/RevertableProperty_with_NoInfo.mdwn new file mode 100644 index 00000000..e9c1eb5d --- /dev/null +++ b/doc/todo/RevertableProperty_with_NoInfo.mdwn @@ -0,0 +1,29 @@ +Currently, a RevertableProperty's Properties always both HasInfo. This +means that if a Property NoInfo is updated to be a RevertableProperty, and +someplace called ensureProperty on it, that will refuse to compile. + +The workaround is generally to export the original NoInfo property under +a different name, so it can still be used with ensureProperty. + +This could be fixed: + + data RevertableProperty i1 i2 where + RProp :: Property i1 -> Property i2 -> RevertableProperty i1 i2 + +However, needing to write "RevertableProperty HasInfo NoInfo" is quite +a mouthful! + +Since only 2 places in the propellor source code currently need to deal +with this, it doesn't currently seem worth making the change, unless a less +intrusive way can be found. + +Probably related would be to make RevertableProperty a constructor in the +Property GADT, which would allow more property combinators to work on +RevertableProperties. That would look like: + + data Propety i where + ... + RProp :: Property i1 -> Property i2 -> Property (CInfo i1 i2) + +In this case, there's only one Info/NoInfo encompassing both sides, and +so ensureProperty could only be used on it if both sides were NoInfo. diff --git a/doc/todo/info_propigation_out_of_nested_properties.mdwn b/doc/todo/info_propigation_out_of_nested_properties.mdwn index 33ac1424..536d6719 100644 --- a/doc/todo/info_propigation_out_of_nested_properties.mdwn +++ b/doc/todo/info_propigation_out_of_nested_properties.mdwn @@ -1,3 +1,5 @@ +> Now [[fixed|done]]!! --[[Joey]] + Currently, Info about a Host's Properties is propigated to the host by examining the tree of Properties. |