Is it possible to write an arara rule that invokes another arara rule?

Question

Is it possible to create an arara rule which possibly invokes other arara rules?

I've managed to write an arara rule which conditionally executes a command.

!config
# open rule for arara
# author: AEllett
# requires arara 3.0+
identifier: open
name: PREVIEW
commands:
  - <arara>  @{isTrue ( isFile ("./.design/open.pdf.true"), 
                        "open ".concat(getBasename(file)).concat('".pdf"')
                        ""
                      )}
arguments: []

what I would like to do is write a similar rule which would conditionally invoke another arara rule.

Answer 1

With the current version of arara which is available via CTAN, it's quite difficult. However Paulo provides a new arara version at GitHub which won't be uploaded to CTAN in a short time.

The new version has some nice gimmicks which are well explained in the Wiki.

If you are using arara 4RC3 you can use the following header:

% arara: pdflatex: { shell: true } if missing ('use.pstricks.true')
% arara: pstricks if exists ('use.pstricks.true')

The rule pstricks could be:

!config
# pstricks rule for arara
# author: Marco Daniel
# requires arara 4.0+
identifier: pstricks
name: LATEX-DVIPS-PS2PDF
commands: 
    - <arara> latex @{action} @{draft} @{shell} @{synctex} @{options} "@{file}"
    - <arara> dvips "@{getBasename(file)}.dvi" -o "@{getBasename(file)}.ps" @{dvipsoptions} 
    - <arara> ps2pdf @{ps2pdfoptions} "@{getBasename(file)}.ps" "@{output}.pdf"
arguments:
#arguments for convertion
- identifier: output
  flag: <arara> @{parameters.output}
  default: <arara> @{getBasename(file)}
- identifier: dvipsoptions
  flag: <arara> @{parameters.options}
- identifier: ps2pdfoptions
  flag: <arara> @{parameters.options}
#arguments for latex
- identifier: action
  flag: <arara> --interaction=@{parameters.action}
- identifier: shell
  flag: <arara> @{isTrue(parameters.shell,"--shell-escape","--no-shell-escape")}
- identifier: synctex
  flag: <arara> @{isTrue(parameters.synctex,"--synctex=1","--synctex=0")}
- identifier: draft
  flag: <arara> @{isTrue(parameters.draft,"--draftmode")}
- identifier: options
  flag: <arara> @{parameters.options}