Add Shebang support for scripts? about flk HOT 10 CLOSED

@charlespwd I just pushed a fix for using flk in the hash-bang. To test this:

• Have flk on your path.
• Have a script with #!/usr/bin/env flk as the first line.
• Make it executable.

Then call your Fleck script and it should execute correctly.

Please let me know if you get a chance to test it so we can close this one.

from flk.

Works! Awesome!

from flk.

Ah it looks like that's not possible because of shebang nesting.

Most operating systems do not allow a shell script to be the interpreter in a shebang for security reasons. – chepner Nov 14 '15 at 15:33

from flk.

Ah that's a bummer. What about if there was a small compiler script which would take your script + the fleck source and compile them together into a new file? Shouldn't be hard to whip up.

from flk.

I just whipped this up:

$ cat wow.clj 
(println "WOW")

$ make DEST=wow INSERT=./wow.clj
cat mal/bash/mal | sed '/then exit/,$d' > wow
cat src/extras.sh >> wow
echo 'read -d "" _REPCAPTURE <<INLINEMALFILE' >> wow
cat mal/lib/alias-hacks.mal  mal/lib/pprint.mal  >> wow
[ "./wow.clj" = "" ] || cat ./wow.clj >> wow
echo 'INLINEMALFILE\nREP "(do ${_REPCAPTURE})";\n' >> wow
cat src/file-repl.sh >> wow
chmod 755 wow

$ ./wow 
WOW
Fleck
user>

Would that work for you as a temporary solution?

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Docs here: https://github.com/chr15m/flk#compile

from flk.

@charlespwd since the fix for #3 I now see the following when I do this:

$ ./shebangtest
Error: "'#!/usr/bin/env' not found"

So maybe this is what was happening to you above but the error was getting swallowed?

This error is flk itself getting confused by the shebang and is something we could/should fix.

There seems to be some inconsistency with regards to nested shebangs - can I ask what OS you are on?

from flk.

Sure, I'm on arch linux 5.3.13-arch1-1.

Would we have a #!/usr/bin/env in the middle of the file if we merge them like you said eariler? Especially since lisp/clojure doesn't use # as a comment.

Could simply write the script without the leading shebang though 🤔.

from flk.

That #!/usr/bin/env already happens because of the way mal compiles the scripts together but it's not a problem. I think the fix for this is to get fleck to special-case parsing the first line of the file if it's a shebang and ignore it. Will investigate further.

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@charlespwd thank you very much for testing.

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