Show HN: Teleport: Simple command line app tutorial written in Haskell

http://bollu.github.io/teleport/

by bollu • 10 years ago

76 28 10 years ago

bollu.github.io

imaginenore2• 10 years ago

You might want to reconsider the name. There's already software named Teleport.

http://www.tenmax.com/teleport/pro/home.htm

ullarah• 10 years ago

The product you linked is called 'Teleport Pro' which allows you to do website mirroring for offline browsing.

The link that has been originally posted is a CLI based tool which has nothing to do with website mirroring.

imaginenore2• 10 years ago

That's not how copyright / trademarks work. Try and name your software Photoshop Kids or Photoshop Palette. Adobe's lawyers will rip you a new one quite quickly if you attempt to tell them "it has nothing to do with editing images".

shorsher• 10 years ago

There also this SSH management software named teleport[0].

[0] https://github.com/gravitational/teleport

Kiro• 10 years ago

It's a tutorial. You can name the finished product whatever you want.

jastanton• 10 years ago

A trick I commonly use is:

    cd -

Which goes back to the previous directly I was just on. They have the same thing for git as well:

    git checkout -

it's quite handy for switching back and forth between branches or directories!

gbersac• 10 years ago

Thanks for gi checkout -. I am currently using git checkout @{-1} which does the same thing...in a more verbose way.

epidemian• 10 years ago

I recently learned that this trick also works with merge. `git merge -` merges the last branch you were on onto the current one. So far i've found it very useful :)

Fnoord• 10 years ago

I was using $OLDPWD and your solution is much shorter, cheers. Both also work in my shell, Fish. Perhaps obvious, but it is also possible to use cd - twice to get back to orig.

iamdave2• 10 years ago

What's the advantage of this over pushd/popd?

mbel2• 10 years ago

I think the point of the linked page is to show how to implement a command line app in Haskell. Teleport is just an example, as such it doesn't really have to be a great tool for everyday usage.

On the other hand, teleport seems to actually provide a much better UX than pushd/popd:

1. it's a hash-table not a stack (directories are named), so it allows random access to memorized directories.

2. it is possible to display the current state.

3. remembered directories are persistent between shell sessions.

taeric3• 10 years ago

Naming directories seems like an odd choice. Sounds like aliases?

Regardless, pushd/popd/dirs is a tough experience. Seems capable of a lot, but I only use it for bouncing between two directories, typically.

The tool I like, but can't remember the name of is basically 'cd ${PWD:src/tst}'. Only, a little more terse.

Haven't used it in a while either, since I've primarily switched to eshell.

andrewfromx3• 10 years ago

I can do this with aliases in .bash_profile right?

mbel2• 10 years ago

Of course you can. Inside .bashrc you have access to aliases (a facility to name things) and to a Touring-complete programming language (a tool to make things). There is little you can't do in .bashrc

andrewfromx3• 10 years ago

right so why do I need teleport?

mbb70• 10 years ago

This is why I refuse to give up on my `will_stop_or_run_forever` script.

andrewfromx3• 10 years ago

also your prompt with "Name's MacBook Pro" is way too long. Shorter that thing!

harel2• 10 years ago

Very nice. I use a set of bash functions to do the same thing, with tab-autocompletion (not my own development, I picked it up from the web somewhere long ago). Put this in your .bashrc:

    # mark/jump support + completion
    # un/mark name : bookmark a directory or remove one (unmark)
    # jump name : jump to directory
    # marks : show all bookmarks
    export MARKPATH=$HOME/.marks
    function jump {
        cd -P $MARKPATH/$1 2>/dev/null || echo "No such mark: $1"
    }
    function mark {
        mkdir -p $MARKPATH; ln -s $(pwd) $MARKPATH/$1
    }
    function unmark {
        rm -i $MARKPATH/$1
    }
    function marks {
        ls -l $MARKPATH | sed 's/  / /g' | cut -d' ' -f9- | sed 's/ -/\t-/g' && echo
    }
    _completemarks() {
      local curw=${COMP_WORDS[COMP_CWORD]}
      local wordlist=$(find $MARKPATH -type l -printf "%f\n")
      COMPREPLY=($(compgen -W '${wordlist[@]}' -- "$curw"))
      return 0
    }

    complete -F _completemarks jump unmark

ihowlatthemoon• 10 years ago

This is brilliant. Added immediately. It's something I never realized I needed until I found out about it. Thank you.

harel2• 10 years ago

That's exactly what I said when i found out about it. Its just one of those things....

bollu3• 10 years ago

oh, interesting! I don't have a deep understanding of how bash auto-completion works, I'll read through this to adapt it.

I'm glad you liked it :)

LeanderK• 10 years ago

i am not yet convinced on literate Haskell besides tutorials. It makes the source-code hard to read and understand, too much noise for this little amount of source-code.

Show HN: Teleport: Simple command line app tutorial written in Haskell

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