Generated by XState Viz: https://xstate.js.org/viz

machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const commitMachine = Machine({
    id: 'commit',
    initial: 'editing',
    context: {
      newBranchName: '',
      existingBranchName: '',
      selection: [],
      error: ''
    },
    states: {
      editing: {
        type: 'parallel',
        states: {
          selection: {
            initial: 'empty',
            on: {
              CHANGE_SELECTION: [
                {
                  target: '.empty',
                  cond: 'isEmpty',
                  actions: ['setSelection']
                },
                {
                  target: '.valid',
                  actions: ['setSelection']
                }
              ]
            },
            states: {
              hist: {
                type: 'history'
              },
              empty: {},
              valid: {},
            }
          },
          branch: {
            initial: 'newBranch',
            states: {
              hist: {
                type: 'history',
                history: 'deep'
              },
              newBranch: {
                initial: 'empty',
                on: {
                  SET_EXISTING_BRANCH: [
                    {
                      target: 'existingBranch.empty',
                      cond: 'isExistingBranchNameEmpty'
                    },
                    {
                      target: 'existingBranch.valid'
                    }
                  ],
                  CHANGE_NEW_BRANCH_NAME: [
                    { 
                      target: '.empty',
                      cond: 'isEmpty',
                      actions: ['setNewBranchName']
                    },
                    {
                      target: '.valid',
                      actions: ['setNewBranchName']
                    }
                  ]
                },
                states: {
                  empty: {},
                  valid: {}
                }
              },
              existingBranch: {
                initial: 'empty',
                on: {
                  SET_NEW_BRANCH: [
                    { 
                      target: 'newBranch.empty',
                      cond: 'isNewBranchNameEmpty'
                    },
                    {
                      target: 'newBranch.valid'
                    }
                  ],
                  CHANGE_EXISTING_BRANCH_NAME: [
                    { 
                      target: '.empty',
                      cond: 'isEmpty',
                      actions: ['setExistingBranchName']
                    },
                    {
                      target: '.valid',
                      actions: ['setExistingBranchName']
                    }
                  ]
                },
                states: {
                  empty: {},
                  valid: {}
                }
              }
            }
          }
        },
        on: {
          SUBMIT: [
            {
              target: 'committingToNewBranch',
              in: {editing: {selection: 'valid', branch: {newBranch: 'valid'}}},
              actions: ['clearError']
            },
            {
              target: 'committingToExistingBranch',
              in: {editing: {selection: 'valid', branch: {existingBranch: 'valid'}}},
              actions: ['clearError']
            }
          ]
        }
      },
      committingToNewBranch: {
        on: {
          SUCCESS: 'success',
          ERROR: {
            target: ['editing.selection.hist', 'editing.branch.hist'],
            actions: ['setError']
          }
        }
      },
      committingToExistingBranch: {
        on: {
          SUCCESS: {
            target: ['editing.selection', 'editing.branch.existingBranch.valid'],
            actions: ['clearSelection', 'notifySuccess']
          },
          ERROR: {
            target: ['editing.selection.hist', 'editing.branch.hist'],
            actions: ['setError']
          }
        }
      },
      success: {
        on: {
          COPY_TO_CLIPBOARD: {
            actions: ['copyToClipboard', 'notifyCopied']
          },
          DONE: {
            target: ['editing.selection', 'editing.branch.existingBranch.valid'],
            actions: ['clearSelection', 'moveNewBranchNameToExistingBranchName']
          }
        }
      }
    }
  },
  {
    actions: {
      setNewBranchName: assign({
        newBranchName: (context, event) => event.value
      }),
      setExistingBranchName: assign({
        existingBranchName: (context, event) => event.value
      }),
      setSelection: assign({
        selection: (context, event) => event.value
      }),
      setError: assign({
        error: (context, event) => event.value
      }),
      clearError: assign({
        error: ''
      }),
      moveNewBranchNameToExistingBranchName: assign({
        existingBranchName: context => context.newBranchName,
        newBranchName: ''
      })
    },
    guards: {
      isEmpty: (context, event) => {
        if (typeof event.value === 'string') {
          return event.value === ''
        }
        
        if (Array.isArray(event.value)) {
          return event.value.length === 0
        }
        
        return true
      },
      isNewBranchNameEmpty: context => context.newBranchName === '',
      isExistingBranchNameEmpty: context => context.existingBranchName === ''
    }
  });