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author | Micah Anderson <micah@riseup.net> | 2015-01-27 15:14:18 -0500 |
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committer | Micah Anderson <micah@riseup.net> | 2015-01-27 15:14:18 -0500 |
commit | 71123634744b9fe2ec7d6a3e38e9789fd84801e3 (patch) | |
tree | 1794e812d83facd93b3007c42632c63ddf1eb2fc /lib/puppet/parser/functions/pick_default.rb | |
parent | 71cb0f4c2c3bf95f62c9f189f5cef155b09a9682 (diff) | |
parent | 5863ab3901368310186790980aea2b0bf7cecb06 (diff) |
Merge branch 'master' into leap
Diffstat (limited to 'lib/puppet/parser/functions/pick_default.rb')
-rw-r--r-- | lib/puppet/parser/functions/pick_default.rb | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/pick_default.rb b/lib/puppet/parser/functions/pick_default.rb new file mode 100644 index 0000000..36e33ab --- /dev/null +++ b/lib/puppet/parser/functions/pick_default.rb @@ -0,0 +1,35 @@ +module Puppet::Parser::Functions + newfunction(:pick_default, :type => :rvalue, :doc => <<-EOS + +This function is similar to a coalesce function in SQL in that it will return +the first value in a list of values that is not undefined or an empty string +(two things in Puppet that will return a boolean false value). If no value is +found, it will return the last argument. + +Typically, this function is used to check for a value in the Puppet +Dashboard/Enterprise Console, and failover to a default value like the +following: + + $real_jenkins_version = pick_default($::jenkins_version, '1.449') + +The value of $real_jenkins_version will first look for a top-scope variable +called 'jenkins_version' (note that parameters set in the Puppet Dashboard/ +Enterprise Console are brought into Puppet as top-scope variables), and, +failing that, will use a default value of 1.449. + +Note that, contrary to the pick() function, the pick_default does not fail if +all arguments are empty. This allows pick_default to use an empty value as +default. + +EOS +) do |args| + fail "Must receive at least one argument." if args.empty? + default = args.last + args = args[0..-2].compact + args.delete(:undef) + args.delete(:undefined) + args.delete("") + args << default + return args[0] + end +end |