/usr/share/fish/completions/ninja.fish is in fish-common 2.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | complete -c ninja -f -a '(__fish_print_ninja_targets)' -d Target
complete -x -c ninja -s t -x -a "(__fish_print_ninja_tools)" -d Tools
complete -x -c ninja -s C -x -a "(__fish_complete_directories (commandline -ct))" -d "Change to DIR"
complete -c ninja -s f -x -d "specify build file"
complete -f -c ninja -s n -d "dry run"
complete -f -c ninja -s v -d "show all command lines while building"
complete -f -c ninja -s j -d "number of jobs"
complete -f -c ninja -s l -d "do not start if load > N"
complete -f -c ninja -s k -d "keep until N jobs fail"
complete -f -c ninja -s h -d "help"
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