New wildcard function for replace

[josephgarnier]

Please note that the PR include my previous PR #544.

Currently for a "rename and move" action, it is not possible to specify a user-defined wildcard that use a replace function with something other than a string as replacement. For example, if I want my files to be moved into directories named after my collection names after they have been transformed according to the "every word starts with a capital letter" rule, this is not possible.

To perform the operation described above, the regex and json to be used are the following:

"2": {
    "default": {
      "field": "collectionPaths",
      "operations": [
        {
          "function": "replace",
          "regex": "(^|\\s+|_+|\\/)(\\w{1})(?![nd|r]{1})",
          "replacement": "????"
        }
      ]
    }
  }

But it is clear that it is impossible to specify what to replace the matches with. So in this PR, I propose the possibility to use as replacement "a string" (the current behavior) or a "js function". Behind the scene, this means that we won't just use string.replace with a string as parameter, but rather, string.replace with a function as parameter (see the js doc).

Thus with this PR, it is now possible to perform a complex operation on a match using this json format:

"<id>": {
    "default": {
      "field": "<a field>",
      "operations": [
        {
          "function": "replace",
          "regex": "<a regex>",
          "replacementFunction": {
            "arguments": [
              "<arg1>",
              "<arg2>",
              "...",
              "<argn>"
            ],
            "body": "<my js code>; return <my returned string>;"
          }
        }
      ]
    }

Applied to my initial example, this would give :

"2": {
    "default": {
      "field": "collectionPaths",
      "operations": [
        {
          "function": "replace",
          "regex": "(^|\\s+|_+|\\/)(\\w{1})(?![nd|r]{1})",
          "replacementFunction": {
            "arguments": [
              "match",
              "g1",
              "g2",
              "offset",
              "string"
            ],
            "body": "return g1.concat(g2.toUpperCase());"
          }
        }
      ]
    }

[raphaelhuleux]

+1