(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:USAGE)
          op: Equal
          rhs: 
            {
              (SQ 
                <
"[-p] [--max-count=<n>] [<since>..<limit>] [--pretty=<format>] [-m] [git-diff-tree options] [git-rev-list options]"
                >
              )
            }
          spids: [4]
        )
      ]
      spids: [4]
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:SUBDIRECTORY_OK) op:Equal rhs:{(SQ <Yes>)} spids:[9])]
      spids: [9]
    )
    (C {(.)} {(git-sh-setup)})
    (AndOr
      children: [
        (Assignment
          keyword: Assign_None
          pairs: [
            (assign_pair
              lhs: (LhsName name:diff_tree_flags)
              op: Equal
              rhs: 
                {
                  (CommandSubPart
                    command_list: 
                      (CommandList
                        children: [
                          (C {(git-rev-parse)} {(--sq)} {(--no-revs)} {(--flags)} {(DQ ($ VSub_At "$@"))})
                        ]
                      )
                    left_token: <Left_CommandSub "$(">
                    spids: [20 32]
                  )
                }
              spids: [19]
            )
          ]
          spids: [19]
        )
        (C {(exit)})
      ]
      op_id: Op_DPipe
    )
    (Case
      to_match: {(DQ ($ VSub_Number "$0"))}
      arms: [
        (case_arm
          pat_list: [{(Lit_Other "*") (whatchanged)}]
          action: [
            (Assignment
              keyword: Assign_None
              pairs: [(assign_pair lhs:(LhsName name:count) op:Equal rhs:{(SQ )} spids:[51])]
              spids: [51]
            )
            (AndOr
              children: [
                (C {(test)} {(-z)} {(DQ ($ VSub_Name "$diff_tree_flags"))})
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:diff_tree_flags)
                      op: Equal
                      rhs: 
                        {
                          (CommandSubPart
                            command_list: 
                              (CommandList
                                children: [(C {(git)} {(config)} {(--get)} {(whatchanged.difftree)})]
                              )
                            left_token: <Left_CommandSub "$(">
                            spids: [66 74]
                          )
                        }
                      spids: [65]
                    )
                  ]
                  spids: [65]
                )
              ]
              op_id: Op_DAmp
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:diff_tree_default_flags)
                  op: Equal
                  rhs: {(SQ <"-c -M --abbrev">)}
                  spids: [77]
                )
              ]
              spids: [77]
            )
          ]
          spids: [46 48 82 -1]
        )
        (case_arm
          pat_list: [{(Lit_Other "*") (show)}]
          action: [
            (Assignment
              keyword: Assign_None
              pairs: [(assign_pair lhs:(LhsName name:count) op:Equal rhs:{(-n1)} spids:[89])]
              spids: [89]
            )
            (AndOr
              children: [
                (C {(test)} {(-z)} {(DQ ($ VSub_Name "$diff_tree_flags"))})
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:diff_tree_flags)
                      op: Equal
                      rhs: 
                        {
                          (CommandSubPart
                            command_list: 
                              (CommandList
                                children: [(C {(git)} {(config)} {(--get)} {(show.difftree)})]
                              )
                            left_token: <Left_CommandSub "$(">
                            spids: [105 113]
                          )
                        }
                      spids: [104]
                    )
                  ]
                  spids: [104]
                )
              ]
              op_id: Op_DAmp
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:diff_tree_default_flags)
                  op: Equal
                  rhs: {(SQ <"--cc --always">)}
                  spids: [116]
                )
              ]
              spids: [116]
            )
          ]
          spids: [84 86 121 -1]
        )
      ]
      spids: [38 44 123]
    )
    (AndOr
      children: [
        (C {(test)} {(-z)} {(DQ ($ VSub_Name "$diff_tree_flags"))})
        (Assignment
          keyword: Assign_None
          pairs: [
            (assign_pair
              lhs: (LhsName name:diff_tree_flags)
              op: Equal
              rhs: {(DQ ($ VSub_Name "$diff_tree_default_flags"))}
              spids: [136]
            )
          ]
          spids: [136]
        )
      ]
      op_id: Op_DAmp
    )
    (AndOr
      children: [
        (Assignment
          keyword: Assign_None
          pairs: [
            (assign_pair
              lhs: (LhsName name:rev_list_args)
              op: Equal
              rhs: 
                {
                  (CommandSubPart
                    command_list: 
                      (CommandList
                        children: [
                          (C {(git-rev-parse)} {(--sq)} {(--default)} {(HEAD)} {(--revs-only)} 
                            {(DQ ($ VSub_At "$@"))}
                          )
                        ]
                      )
                    left_token: <Left_CommandSub "$(">
                    spids: [143 157]
                  )
                }
              spids: [142]
            )
          ]
          spids: [142]
        )
        (AndOr
          children: [
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:diff_tree_args)
                  op: Equal
                  rhs: 
                    {
                      (CommandSubPart
                        command_list: 
                          (CommandList
                            children: [
                              (C {(git-rev-parse)} {(--sq)} {(--no-revs)} {(--no-flags)} 
                                {(DQ ($ VSub_At "$@"))}
                              )
                            ]
                          )
                        left_token: <Left_CommandSub "$(">
                        spids: [162 174]
                      )
                    }
                  spids: [161]
                )
              ]
              spids: [161]
            )
            (Pipeline
              children: [
                (C {(eval)} 
                  {
                    (DQ ("git-rev-list ") ($ VSub_Name "$count") (" ") ($ VSub_Name "$rev_list_args"))
                  }
                )
                (C {(eval)} 
                  {
                    (DQ ("git-diff-tree --stdin --pretty -r ") ($ VSub_Name "$diff_tree_flags") (" ") 
                      ($ VSub_Name "$diff_tree_args")
                    )
                  }
                )
                (SimpleCommand
                  words: [
                    {
                      (BracedVarSub
                        token: <VSub_Name PAGER>
                        suffix_op: (StringUnary op_id:VTest_ColonHyphen arg_word:{(less)})
                        spids: [207 211]
                      )
                    }
                  ]
                  more_env: [
                    (env_pair
                      name: LESS
                      val: {(DQ ($ VSub_Name "$LESS") (" -S"))}
                      spids: [201]
                    )
                  ]
                )
              ]
              negated: False
            )
          ]
          op_id: Op_DAmp
        )
      ]
      op_id: Op_DAmp
    )
  ]
)