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[feature] support shell completions #62
Description
Can it support generating completions for common shells? For python's argparse, we have shtab, can generate shell completion script from a template.
Solution 1: Let user do it by themselves
# After installing foo
$ foo --print-completion bash | sudo tee /usr/share/bash-completion/completions/foo
# completion can work
$ foo -<TAB>
Solution 2: Write some install() in cmake
$ cmake -Bbuild -DCMAKE_INSTALL_PREFIX=/usr
$ cmake --build build
$ cmake --install build
$ ls /usr/share/bash-completion/completions/foo
/usr/share/bash-completion/completions/foo
# completion can work
$ foo -<TAB>
I thinks solution 2 will be better?
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