ok things I want for my shell that if it exists easily with zsh i'd love to know about:
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empty field tab completion gives most-recently-used list of command
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if it takes flags, give me the flag completion list before trying to complete to folders. or a separate key.
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enumerate completions not just from man pages like fish, but also --help output and or source. I do not care how long this takes, I can run it weekly or for specific commands
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completion list with flag summaries from man pages, like some hand-spun zsh completions w/ plugin
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takes bash scripts, or an easy translation script
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built with the assumption that your configs, aliases, etc will be on git. spectrum from "they're all in these files" to "you can rollback aliases by edit as a built in function'
consider this both aspirationalposting and lazyweb