(command.CommandList
  children: [
    (command.ShFunction
      name: Usage
      body: 
        (command.BraceGroup
          children: [
            (command.Simple
              words: [
                {(echo)}
                {
                  (DQ ('Usage: ') 
                    (command_sub
                      left_token: (Token id:Id.Left_Backtick val:'`' span_id:24)
                      command_list: 
                        (command.CommandList
                          children: [(C {(basename)} {($ Id.VSub_Number '$0')})]
                        )
                    ) (' mon|tue|... [next]|week|last')
                  )
                }
              ]
              redirects: [
                (redir.Redir
                  op: (Token id:Id.Redir_GreatAnd val:'>&' span_id:34)
                  fd: -1
                  arg_word: {(2)}
                )
              ]
            )
            (command.ControlFlow
              token: (Token id:Id.ControlFlow_Exit val:exit span_id:38)
              arg_word: {(1)}
            )
          ]
        )
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (C {(Id.Lit_LBracket '[')} {(DQ ($ Id.VSub_Pound '$#'))} {(-eq)} {(DQ (0))} 
          {(Id.Lit_RBracket ']')}
        )
        (C {(Usage)})
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:day)
          op: assign_op.Equal
          rhs: {($ Id.VSub_Number '$1')}
          spids: [64]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:which)
          op: assign_op.Equal
          rhs: {($ Id.VSub_Number '$2')}
          spids: [67]
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (C {(Id.Lit_LBracket '[')} {(-z)} {(DQ ($ Id.VSub_DollarName '$which'))} {(Id.Lit_RBracket ']')})
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:which)
              op: assign_op.Equal
              rhs: {(next)}
              spids: [82]
            )
          ]
        )
      ]
    )
    (command.Case
      to_match: {($ Id.VSub_DollarName '$which')}
      arms: [
        (case_arm
          pat_list: [{(week)}]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (C {(Id.Lit_LBracket '[')} 
                          {
                            (command_sub
                              left_token: (Token id:Id.Left_Backtick val:'`' span_id:100)
                              command_list: 
                                (command.CommandList
                                  children: [(C {(date)} {(Id.Lit_Other '+') (Id.Lit_Other '%') (D)})]
                                )
                            )
                          } {(Id.Lit_Equals '=')} 
                          {
                            (command_sub
                              left_token: (Token id:Id.Left_Backtick val:'`' span_id:112)
                              command_list: 
                                (command.CommandList
                                  children: [
                                    (C {(date)} 
                                      {(--date) (Id.Lit_Equals '=') 
                                        (DQ ('next ') ($ Id.VSub_DollarName '$day'))
                                      } {(Id.Lit_Other '+') (Id.Lit_Other '%') (D)}
                                    )
                                  ]
                                )
                            )
                          } {(Id.Lit_RBracket ']')}
                        )
                      terminator: (Token id:Id.Op_Semi val:';' span_id:130)
                    )
                  ]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:weeks)
                          op: assign_op.Equal
                          rhs: {(Id.Lit_Other '+') (2)}
                          spids: [135]
                        )
                      ]
                    )
                  ]
                  spids: [96 132]
                )
              ]
              else_action: [
                (command.ShAssignment
                  pairs: [
                    (assign_pair
                      lhs: (sh_lhs_expr.Name name:weeks)
                      op: assign_op.Equal
                      rhs: {(Id.Lit_Other '+') (1)}
                      spids: [146]
                    )
                  ]
                )
              ]
            )
          ]
          spids: [92 93 153 -1]
        )
        (case_arm
          pat_list: [{(last)}]
          action: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:weeks)
                  op: assign_op.Equal
                  rhs: {(-1)}
                  spids: [159]
                )
              ]
            )
          ]
          spids: [155 156 161 -1]
        )
        (case_arm
          pat_list: [{(next)}]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (C {(Id.Lit_LBracket '[')} 
                          {
                            (command_sub
                              left_token: (Token id:Id.Left_Backtick val:'`' span_id:171)
                              command_list: 
                                (command.CommandList
                                  children: [(C {(date)} {(Id.Lit_Other '+') (Id.Lit_Other '%') (D)})]
                                )
                            )
                          } {(Id.Lit_Equals '=')} 
                          {
                            (command_sub
                              left_token: (Token id:Id.Left_Backtick val:'`' span_id:183)
                              command_list: 
                                (command.CommandList
                                  children: [
                                    (C {(date)} 
                                      {(--date) (Id.Lit_Equals '=') 
                                        (DQ ('next ') ($ Id.VSub_DollarName '$day'))
                                      } {(Id.Lit_Other '+') (Id.Lit_Other '%') (D)}
                                    )
                                  ]
                                )
                            )
                          } {(Id.Lit_RBracket ']')}
                        )
                      terminator: (Token id:Id.Op_Semi val:';' span_id:201)
                    )
                  ]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:weeks)
                          op: assign_op.Equal
                          rhs: {(Id.Lit_Other '+') (1)}
                          spids: [206]
                        )
                      ]
                    )
                  ]
                  spids: [167 203]
                )
              ]
              else_action: [
                (command.ShAssignment
                  pairs: [
                    (assign_pair
                      lhs: (sh_lhs_expr.Name name:weeks)
                      op: assign_op.Equal
                      rhs: {(Id.Lit_Other '+') (0)}
                      spids: [217]
                    )
                  ]
                )
              ]
            )
          ]
          spids: [163 164 224 -1]
        )
        (case_arm
          pat_list: [{(Id.Lit_Star '*')}]
          action: [(C {(Usage)})]
          spids: [226 227 231 -1]
        )
      ]
    )
    (C {(date)} 
      {(--date) (Id.Lit_Equals '=') 
        (DQ ($ Id.VSub_DollarName '$day') (' ') ($ Id.VSub_DollarName '$weeks') (' weeks'))
      } {(Id.Lit_Other '+') (Id.Lit_Other '%') (x)}
    )
  ]
)