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07439cc169
A new prompt that works like 'safePrompt', but is optimized for the use-case of a program that needs a file as an argument. This is necessarily a new function and can't just be achieved by using the old `safePrompt`, as `getShellCompl'` does not at all filter the files (compgen already does that based on the input), but only the available commands. If we start the prompt with a single command then the chosen `searchPredicate` becomes quite useless and we can't take advantage of fuzzy matching for file finding. This, however, is quite useful when having a program that explicitly expects a file as one of its arguments, e.g. dragon [1]. What we have to do instead of to generate all available files with compgen and _then_ filter this down to what we want via a given function. In order to make this change backwards compatible we have to introduce the rather ugly `shellComplImpl`, which takes a laundry list of all of the different parameters that we need. Since the function is not exported, this ugliness does perhaps not matter too much. [1]: https://github.com/mwh/dragon