/usr/share/fish/functions/fish_indent.fish is in fish-common 2.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | function fish_indent --description 'Indenter and prettifier for fish code'
# This is wrapped in a function so that fish_indent does not need to be found in PATH
eval $__fish_bin_dir/fish_indent $argv
end
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