Shell command to update pom file from a variable

Question

Previously I used below command to take the version in pom.xml and increment it from one. Before increment snapshot version is, 0.0.1

#!/bin/bas         


        

Answer 1

Use an XML-aware tool. For example, in xsh you can write

open pom.xml ;
register-namespace m http://maven.apache.org/POM/4.0.0 ;
for //m:version
    set . xsh:subst(., '(?<=\.)([0-9]+)$', '$1+1', 'e') ;
save :b ;

Which changes "0.0.1" to "0.0.2".

To also increment the version if -SNAPSHOT is present, the regular expression becomes a bit more complex:

xsh:subst(., '(?<=\.)([0-9]+)(?=$|-SNAPSHOT$)', '$1+1', 'e') ;
              ^         ^          ^              ^      ^
              |         |          |              |      |
              |         |      Followed by        |  Evaluate replacement
         Preceded       |      end of string      |  as code
         by a dot   At least   or -SNAPSHOT plus  |
                    one digit  end of string     Add one
                                                 to the 1st
                                                 capture group