(List
  (If
    (AndOr OP_OR_IF
      (Com {[LIT_OTHER "["]} {[DQ [VarSub 1]]} {[LIT_OTHER "="] [LIT_OTHER "="]} {[SQ <LIT_CHARS -h>]} {[LIT_OTHER "]"]})
      (Com {[LIT_OTHER "["]} {[DQ [VarSub 1]]} {[LIT_OTHER "="] [LIT_OTHER "="]} {[SQ <LIT_CHARS --help>]} {[LIT_OTHER "]"]})
    )
    (List
      (Com {[LIT_CHARS echo]} {[SQ <LIT_CHARS "test_all_pdfs.sh\n"> <LIT_CHARS "Usage: Run from the trunk directory of a Skia tree to convert a folder of PDFs into PNGs.\n"> <LIT_CHARS "       Many threads will be run simultaneously using the \"parallel\" tool if that tool is\n"> <LIT_CHARS "       installed. \"parallel\" can be installed on linux using \"sudo apt-get install parallel.\"\n"> <LIT_CHARS "       Requires that skdiff and pdfviewer have already been built.\n"> <LIT_CHARS "\n"> <LIT_CHARS "Arguments:\n"> <LIT_CHARS "    folder      Folder containing PDF files. The PNG results will be placed in \"folder/new\".\n"> <LIT_CHARS "                If folder contains a folder named \"old\", the PNGs in \"folder/new\" will be\n"> <LIT_CHARS "                compared to PNGs in \"folder/old\" with the same name, and the differences\n"> <LIT_CHARS "                will be stored in a \"folder/d\".">]})
      (Com {[LIT_CHARS exit]})
    )
  )
  (If
    (Com {[LIT_OTHER "["]} {[LIT_OTHER "!"]} {[LIT_CHARS -f]} {[LIT_CHARS out/Debug/pdfviewer]} {[LIT_OTHER "]"]})
    (List
      (Com {[LIT_CHARS echo]} {[SQ <LIT_CHARS "debug version of pdfviewer is required.">]})
      (Com {[LIT_CHARS exit]})
    )
  )
  (If
    (Com {[LIT_OTHER "["]} {[LIT_CHARS -z]} {[VarSub 1]} {[LIT_OTHER "]"]})
    (List
      (Com {[LIT_CHARS echo]} {[SQ <LIT_CHARS "folder is a required argument.">]})
      (Com {[LIT_CHARS exit]})
    )
  )
  (If
    (Com {[LIT_OTHER "["]} {[LIT_OTHER "!"]} {[LIT_CHARS -d]} {[VarSub 1]} {[LIT_OTHER "]"]})
    (List
      (Com {[LIT_CHARS echo]} {[SQ <LIT_CHARS "folder must be a valid directory.">]})
      (Com {[LIT_CHARS exit]})
    )
  )
  (If
    (Com {[LIT_OTHER "["]} {[LIT_CHARS -d]} {[VarSub 1] [LIT_CHARS /new]} {[LIT_OTHER "]"]})
    (Com {[LIT_CHARS rm]} {[LIT_CHARS -rf]} {[VarSub 1] [LIT_CHARS /new]})
  )
  (Com {[LIT_CHARS mkdir]} {[VarSub 1] [LIT_CHARS /new/]})
  (If
    (Com {[LIT_CHARS command]} {[LIT_CHARS -v]} {[LIT_CHARS parallel]}
      <
      (FilenameRedirectNode filename={[LIT_CHARS /dev/null]} <REDIR_GREAT ">"> 1),
      (DescriptorRedirectNode target={[LIT_CHARS 1]} <REDIR_GREATAND "2>&"> 2),
      >
    )
    (List
      (Com {[LIT_CHARS echo]} {[SQ <LIT_CHARS "Running in parallel">]})
      (Pipeline
        (Com {[LIT_CHARS ls]} {[LIT_CHARS -1]} {[VarSub 1] [LIT_CHARS /] [LIT_OTHER "*"] [LIT_CHARS .pdf]})
        (Com {[LIT_CHARS sed]} {[DQ [LIT_CHARS "s/^/experimental"][\ LIT_ESCAPED_CHAR "\\/"][LIT_CHARS PdfViewer][\ LIT_ESCAPED_CHAR "\\/"][LIT_CHARS scripts][\ LIT_ESCAPED_CHAR "\\/"][LIT_CHARS "vm_pdf_viewer_run_one_pdf.sh /"]]})
        (Com {[LIT_CHARS parallel]})
      )
    )
    (ElseTrue)
    (List
      (Com {[LIT_CHARS echo]} {[SQ <LIT_CHARS "Converting each file sequentially. Install \"parallel\" to convert in parallel.">]})
      (Com {[LIT_CHARS echo]} {[SQ <LIT_CHARS "\"parallel\" can be installed on linux with \"sudo apt-get install parallel\".">]})
      (Pipeline
        (Com {[LIT_CHARS ls]} {[LIT_CHARS -1]} {[VarSub 1] [LIT_CHARS /] [LIT_OTHER "*"] [LIT_CHARS .pdf]})
        (Com {[LIT_CHARS xargs]} {[LIT_CHARS experimental/PdfViewer/scripts/vm_pdf_viewer_run_one_pdf.sh]})
      )
    )
  )
  (If
    (Com {[LIT_OTHER "["]} {[LIT_OTHER "!"]} {[LIT_CHARS -d]} {[VarSub 1] [LIT_CHARS /old]} {[LIT_OTHER "]"]})
    (Com {[LIT_CHARS exit]})
  )
  (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('RELEASE_SKDIFF', {[LIT_CHARS out/Release/skdiff]})])
  (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('DEBUG_SKDIFF', {[LIT_CHARS out/Debug/skdiff]})])
  (If
    (Com {[LIT_OTHER "["]} {[LIT_CHARS -f]} {[VarSub RELEASE_SKDIFF]} {[LIT_OTHER "]"]})
    (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('SKDIFF', {[VarSub RELEASE_SKDIFF]})])
    (Com {[LIT_OTHER "["]} {[LIT_CHARS -f]} {[VarSub DEBUG_SKDIFF]} {[LIT_OTHER "]"]})
    (= scope=<EAssignScope.GLOBAL 1> flags=0 words=[] bindings=[('SKDIFF', {[VarSub DEBUG_SKDIFF]})])
    (ElseTrue)
    (List
      (Com {[LIT_CHARS echo]} {[SQ <LIT_CHARS "Build skdiff in order to do comparisons.">]})
      (Com {[LIT_CHARS exit]})
    )
  )
  (If
    (Com {[LIT_OTHER "["]} {[LIT_CHARS -d]} {[VarSub 1] [LIT_CHARS /d]} {[LIT_OTHER "]"]})
    (Com {[LIT_CHARS rm]} {[LIT_CHARS -rf]} {[VarSub 1] [LIT_CHARS /d]})
  )
  (Com {[LIT_CHARS mkdir]} {[VarSub 1] [LIT_CHARS /d]})
  (Com {[VarSub SKDIFF]} {[VarSub 1] [LIT_CHARS /old]} {[VarSub 1] [LIT_CHARS /new]} {[VarSub 1] [LIT_CHARS /d]})
)