(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
      ops: [Op_DPipe]
      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]
        )
        (ControlFlow token:<ControlFlow_Exit exit>)
      ]
    )
    (Case
      to_match: {(DQ ($ VSub_Number '$0'))}
      arms: [
        (case_arm
          pat_list: [{(Lit_Other '*') (whatchanged)}]
          action: [
            (Assignment
              keyword: Assign_None
              pairs: [(assign_pair lhs:(LhsName name:count) op:Equal rhs:{(EmptyPart)} spids:[51])]
              spids: [51]
            )
            (AndOr
              ops: [Op_DAmp]
              children: [
                (C {(test)} {(-z)} {(DQ ($ 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]
                )
              ]
            )
            (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 16777215]
        )
        (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
              ops: [Op_DAmp]
              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]
                )
              ]
            )
            (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 16777215]
        )
      ]
      spids: [38 44 123]
    )
    (AndOr
      ops: [Op_DAmp]
      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 '$diff_tree_default_flags'))}
              spids: [136]
            )
          ]
          spids: [136]
        )
      ]
    )
    (AndOr
      ops: [Op_DAmp Op_DAmp]
      children: [
        (Assignment
          keyword: Assign_None
          pairs: [
            (assign_pair
              lhs: (LhsName name:rev_list_args)
              op: Equal
              rhs: 
                {
                  (CommandSubPart
                    command_list: 
                      (CommandList
                        children: [
                          (C {(git-rev-parse)} {(--sq)} {(--default)} {(HEAD)} {(--revs-only)} 
                            {(DQ ($ VSub_At '$@'))}
                          )
                        ]
                      )
                    left_token: <Left_CommandSub '$('>
                    spids: [143 157]
                  )
                }
              spids: [142]
            )
          ]
          spids: [142]
        )
        (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: F
        )
      ]
    )
  ]
)