Hi Josef, that is indeed an icky problem. There is currently no direct way to get the newly inserted node. Besides carefully recomputing indices like you described, the only other way I can think of is to use the following-sibling and preceding-sibling axes in path expressions. For example, to get the comment right before the first real entry in /etc/hosts you'd do
match /files/etc/hosts/#comment[following-sibling::1][last()] This is based on the fact that the first real entry in /etc/hosts is /files/etc/hosts/1 (i.e., the '1' in the above path expression is the label of a node). /files/etc/hosts/#comment matches all comments in /etc/hosts, [following-sibling::1] restricts that to all the comments that come before /files/etc/hosts/1, and the [last()] picks out the last of those comments. Similarly, you'd pick the comment right after /files/etc/hosts/1 with match /files/etc/hosts/#comment[preceding-sibling::1][1] I'd agree though that writing these path expressions isn't anybody's idea of fun. Another approach would be to change some commands to set a variable (say $_last) to point to the newly inserted node, so that you could just do 'match $_last' to get the inserted node. There's probably more commands that could benefit from that, particularly set. What do you think ? David On Tue, Mar 14, 2017 at 3:12 AM, Josef Reidinger <jreidin...@suse.com> wrote: > Good morning to list, > Let me at first get context. I am using augeas ruby bindings to do some > automatic changes in configuration files. I build some tools around > allowing easier access to augeas, but I have now one challenge. > > In general I have set of modifications, additional entries and removed > entries. My challenge is that path is not stable, so when new entry is > added or removed from array like #comment, then it changes path of > other items in array. > > So consider this scenario. I need to modify two comments, remove two > comments and add comment before another comment. The first part is > easy and I use set. The second part I already solved as I know original > path and do it in reverse order so e.g. remove #comment[50] and > #comment[36]. Then I want to add new #comment before original > #comment[10] but it is no longer #comment[10] and I also do not know > what will be number of new comment ( ok, in this case I know it is path > of comment I inserted before, but sometimes I need to add it before > another key like "inst #comment before $prefix/alias[5]" then is there > easy way how to get path of newly inserted label? like > $prefix/#comment[16] ? > > Also is there way how to get what is old path? Value is not unique, > especially in comments and I find manually counting and changing all > indexes quite complex. > > Thanks for help and tips. > > Josef > > _______________________________________________ > augeas-devel mailing list > augeas-devel@redhat.com > https://www.redhat.com/mailman/listinfo/augeas-devel >
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