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* backends/Dialog: Add support for output handlingRobin Krahl2019-01-08
| | | | | | | | dialog(1) uses stdin to display the dialog boxes and prints output to stderr (if applicable). This patch changes the command invocation in the Dialog backend to capture stderr. stdin and stdout are inherited from the main process so that dialog can display the dialog boxes and receive user input.
* Implement message boxes using the dialog backendRobin Krahl2019-01-08
This patch adds a first dialog box type, message boxes, and a first backend, the dialog(1) tool. It does not yet address the problems of output handling and backend selection.