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Re: [augeas-devel] Help with cobbler lens

On 12/18/2009 04:25 PM, David Lutterkort wrote:
On Fri, 2009-12-18 at 15:53 -0500, Bryan Kearney wrote:
On 12/18/2009 02:24 PM, David Lutterkort wrote:
On Fri, 2009-12-18 at 08:45 -0500, Bryan Kearney wrote:
On 12/17/2009 03:39 PM, David Lutterkort wrote:
On Thu, 2009-12-17 at 11:24 -0500, Bryan Kearney wrote:
I took a first cut at a cobblersettings lens. You can see it at [1]. It
is meant to parse cobbler settings files [2] which is a basic YAML 1.0
syntax. It parses fine, but I am having issues saving a nested

When I run 'augparse cobblersettings.aug', I get a whole bunch of type
errors - do you get them, too ? Those need to be fixed first ...

I see them. The error messages are a bit obscure and the lens seemed to
be working. Is there a FAQ on reading the error messages?

Now there is:

This was helpful. It may be good to explain the syntax of the error
message is

line.column - line.column and the second line is omitted if it does not
change. I was too stupid to realize that.

I am not sitting on this version of th lens:


and get this error when I try and parse:

Test run encountered exception:
cobblersettings.aug:50.11-53.31:exception: overlapping lenses in tree
      Example matched by both:  {  }
      First lens: cobblersettings.aug:50.11-52.42
      Second lens: cobblersettings.aug:48.29-.102

setting_list_suffix and indented_list_suffix both match the empty tree
{ } - I doubt that that is entirely intentional; for setting_list_suffix
you have:

         let setting_list_suffix = lbr . [value_list] . rbr . eol

value_list by itself creates a list of tree nodes. By encloding it in
another [] you are creating a node with no label, whose children will be
the list created by value_list.

It seems more logical to me to give that node a name, e.g. with [label
"list" . value_list], and do something similar for indented_list_suffix.
I am not sure if there is any semantic difference between the notation

   key: [value1, value2]


      - value1
      - value2

These are semantically the same which is the issue. I tried what you said and came away with http://www.pastie.org/749828. I think I am closer, but i am now getting the following errors http://www.pastie.org/749830.

In those errors.. what does the |=| mean? Is that the actual characters?

in YAML, but for purposes of the lens you need to distinguish the two
somehow in the tree. One way is to put the values for one form under a
"list" node, and the other under a "sequence" node or some such. It
should also be possible to put both under a "list" node, and put a
"sequence" node as the first child of the "list", and the entries as
further children of "list".

How would I add a child. Would I stick in a

[label '.foo']

in there?

-- bk

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