I'm trying to call markdown as an external process
I'm trying to do something which (I think) is very simple: I just want to run a line of text through Markdown and get the output. I've spent all day reading through the code for OSProcess and CommandShell. It took me a while, but I finally figured out I can run a command and get its output with: UnixProcess waitForCommandOutput: 'ls ~' The next problem I'm having is getting markdown to run on an arbitrary string. If I go into my shell and do: $ /usr/local/bin/markdown <<END
# This is a heading This is a paragraph with _emphasis_ END <h1>This is a heading</h1>
Then I get the output that I expect: <p>This is a paragraph with <em>emphasis</em></p> I can't figure out how to do this with OSProcess though. I've tried: UnixProcess waitForCommand: ('/usr/local/bin/markdown <<END hello world END') but with no luck. I've also tried using OSProcess at a lower level, setting up the stream input object, but it seems to require a reference to an actual file, rather than just a stream. Anyone have any ideas? I want to take an arbitrary string and use that as the input to my markdown command, and then store that output in an instance variable. I could use some help. Thanks, Pat
On Oct 5, 2010, at 5:05 PM, Pat Maddox wrote:
I'm trying to do something which (I think) is very simple: I just want to run a line of text through Markdown and get the output.
I've spent all day reading through the code for OSProcess and CommandShell. It took me a while, but I finally figured out I can run a command and get its output with:
UnixProcess waitForCommandOutput: 'ls ~'
The next problem I'm having is getting markdown to run on an arbitrary string. If I go into my shell and do:
$ /usr/local/bin/markdown <<END
# This is a heading This is a paragraph with _emphasis_ END <h1>This is a heading</h1>
Then I get the output that I expect: <p>This is a paragraph with <em>emphasis</em></p>
I can't figure out how to do this with OSProcess though. I've tried:
UnixProcess waitForCommand: ('/usr/local/bin/markdown <<END hello world END')
but with no luck. I've also tried using OSProcess at a lower level, setting up the stream input object, but it seems to require a reference to an actual file, rather than just a stream.
Anyone have any ideas? I want to take an arbitrary string and use that as the input to my markdown command, and then store that output in an instance variable. I could use some help.
Thanks, Pat
Okay I've got something which appears to work fine. (OSProcess thisOSProcess command: '/usr/local/bin/markdown' input: '#this is a heading this is a paragraph _with emphasis_') output Kind of a painful day, but glad to be moving on :) Pat
David may help you. Cheers Mariano On Wed, Oct 6, 2010 at 2:27 AM, Pat Maddox <patmaddox@me.com> wrote:
On Oct 5, 2010, at 5:05 PM, Pat Maddox wrote:
I'm trying to do something which (I think) is very simple: I just want to run a line of text through Markdown and get the output.
I've spent all day reading through the code for OSProcess and CommandShell. It took me a while, but I finally figured out I can run a command and get its output with:
UnixProcess waitForCommandOutput: 'ls ~'
The next problem I'm having is getting markdown to run on an arbitrary string. If I go into my shell and do:
$ /usr/local/bin/markdown <<END
# This is a heading This is a paragraph with _emphasis_ END <h1>This is a heading</h1>
Then I get the output that I expect: <p>This is a paragraph with <em>emphasis</em></p>
I can't figure out how to do this with OSProcess though. I've tried:
UnixProcess waitForCommand: ('/usr/local/bin/markdown <<END hello world END')
but with no luck. I've also tried using OSProcess at a lower level, setting up the stream input object, but it seems to require a reference to an actual file, rather than just a stream.
Anyone have any ideas? I want to take an arbitrary string and use that as the input to my markdown command, and then store that output in an instance variable. I could use some help.
Thanks, Pat
Okay I've got something which appears to work fine.
(OSProcess thisOSProcess command: '/usr/local/bin/markdown' input: '#this is a heading this is a paragraph _with emphasis_') output
Kind of a painful day, but glad to be moving on :)
Pat
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Hi Pat, I'm not familiar with Markdown, but it sounds like you want to run an external process (Markdown), write to its standard input from Smalltalk, and read its standard input back into Smalltalk. Try using class PipeableOSProcess for this. There are some examples in the class side methods that show how it works. PipeableOSProcess works at a higher level than the classes in OSProcess, and it will handle the issues of connecting the external process to your image through pipes. Be careful about reading the output from your external Markdown process. Pipes by default work in blocking mode, see #setNonblocking to change this. If you do a read on the output of a blocking pipe, and if there is no data available, your VM will block and your image will be locked up. So save your image frequently until you get the details worked out ;) HTH, Dave On Thu, Oct 07, 2010 at 01:00:24AM +0200, Mariano Martinez Peck wrote:
David may help you.
Cheers
Mariano
On Wed, Oct 6, 2010 at 2:27 AM, Pat Maddox <patmaddox@me.com> wrote:
On Oct 5, 2010, at 5:05 PM, Pat Maddox wrote:
I'm trying to do something which (I think) is very simple: I just want to run a line of text through Markdown and get the output.
I've spent all day reading through the code for OSProcess and CommandShell. It took me a while, but I finally figured out I can run a command and get its output with:
UnixProcess waitForCommandOutput: 'ls ~'
The next problem I'm having is getting markdown to run on an arbitrary string. If I go into my shell and do:
$ /usr/local/bin/markdown <<END
# This is a heading This is a paragraph with _emphasis_ END <h1>This is a heading</h1>
Then I get the output that I expect: <p>This is a paragraph with <em>emphasis</em></p>
I can't figure out how to do this with OSProcess though. I've tried:
UnixProcess waitForCommand: ('/usr/local/bin/markdown <<END hello world END')
but with no luck. I've also tried using OSProcess at a lower level, setting up the stream input object, but it seems to require a reference to an actual file, rather than just a stream.
Anyone have any ideas? I want to take an arbitrary string and use that as the input to my markdown command, and then store that output in an instance variable. I could use some help.
Thanks, Pat
Okay I've got something which appears to work fine.
(OSProcess thisOSProcess command: '/usr/local/bin/markdown' input: '#this is a heading this is a paragraph _with emphasis_') output
Kind of a painful day, but glad to be moving on :)
Pat
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participants (3)
-
David T. Lewis -
Mariano Martinez Peck -
Pat Maddox