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  • How do I defer execution of some Ruby code until later and run it on demand in this scenario?

    - by Kyle Kaitan
    I've got some code that looks like the following. First, there's a simple Parser class for parsing command-line arguments with options. class Parser def initialize(&b); ...; end # Create new parser. def parse(args = ARGV); ...; end # Consume command-line args. def opt(...); ...; end # Declare supported option. def die(...); ...; end # Validation handler. end Then I have my own Parsers module which holds some metadata about parsers that I want to track. module Parsers ParserMap = {} def self.make_parser(kind, desc, &b) b ||= lambda {} module_eval { ParserMap[kind] = {:desc => "", :validation => lambda {} } ParserMap[kind][:desc] = desc # Create new parser identified by `<Kind>Parser`. Making a Parser is very # expensive, so we defer its creation until it's actually needed later # by wrapping it in a lambda and calling it when we actually need it. const_set(name_for_parser(kind), lambda { Parser.new(&b) }) } end # ... end Now when you want to add a new parser, you can call make_parser like so: make_parser :db, "login to database" do # Options that this parser knows how to parse. opt :verbose, "be verbose with output messages" opt :uid, "user id" opt :pwd, "password" end Cool. But there's a problem. We want to optionally associate validation with each parser, so that we can write something like: validation = lambda { |parser, opts| parser.die unless opts[:uid] && opts[:pwd] # Must provide login. } The interface contract with Parser says that we can't do any validation until after Parser#parse has been called. So, we want to do the following: Associate an optional block with every Parser we make with make_parser. We also want to be able to run this block, ideally as a new method called Parser#validate. But any on-demand method is equally suitable. How do we do that?

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  • Multi Module Project - Assembly plugin

    - by user209947
    I am using Maven 2.0.9 to build a multi module project. I have defined the assembly plugin in my parent pom. I can get my assemblies built using mvn install assembly:assembly This command runs the tests twice, once during install phase and another during assembly. I tried assembly:single but it throws an error. Any help to get my assemblies built without running the tests twice is much appreciated.

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  • How to launch a c program from another c program

    - by michael
    Hi, I have a c program which I can launch at command prompt. Is it possible for me the lunch this application in my another c program? If yes, how? All the google result shows me how to do that using pthread? Will that work? I suspect that I need a new process for my c program. Thank you.

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  • Speed up PostGreSQL createdb?

    - by John
    Is there a way to speed up PostgreSQL's createdb command? Normally I wouldn't care, but doing unit testing in Django creates a database every time, and it takes about 5 seconds. I'm using openSUSE 11.2 64-bit, PostgreSQL 8.4.2

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  • How to script a URL screenshot without X?

    - by cwopen
    I'd like to automate a 'screenshot' of arbitary URL's using a Linux build that doesn't have X installed. There appears to be some (costly) web services to do this, but I specifically want something I can do locally. Tried imagemagick without much success, though Mozilla used to have a command line option to do it?

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  • Get file name before the extension

    - by ryanprayogo
    I have some files in the same directory (in UNIX filesystem) that looks like: a.txt.name b.xml.name c.properties.name a.txt.name2 b.xml.name2 c.properties.name2 How do I get the string before the name or name2 part using some shell command? ie. the a.txt, b.xml, c.properties part?

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  • How to list all files in a repository in Mercurial (hg)?

    - by JamesWampler
    Is there a command in mercurial that will list all files currently under source control? I can do a dir /s to list all files in my folder and subfolders, but I have no idea which have been added to my repository. I have a variety of excluded file types and folders and I want verify that none of them were added before I set them up in my .hgignore file.

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  • svn, how to downalod a file from the site 'tigris'

    - by Robin
    hi, sorry for maybe this is stupid question, I just want download source code form the link as follows: http://argouml.tigris.org/source/browse/argouml/trunk/src/ I try to use the command : svn checkout http://argouml.tigris.org/source/browse/argouml/trunk/ but it throw error : svn: OPTIONS of 'http://argouml.tigris.org/source/browse/argouml/trunk': 200 OK (http://argouml.tigris.org) I am strange that , how to checkout the source code from the url ? many thanks for your help ! Regards

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  • Groovy rootLoader is null

    - by Geo
    When running a groovy script from Eclipse, the following line: def rootLoader = this.class.getClassLoader().getRootLoader() is null. When I run the script directly from command line, this is not null. How can I find out why this happens?

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  • How I can get PUID from mp3-file?

    - by volume
    I want to streamline my library on FreeBsd using PUID from MusicBrainz. I need a command line utility for this, but I have not been able to find. It would be nice to give input mp3-file and receive PUID as result.

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  • How to do svn ignore on a single file?

    - by Zando
    I know it's a basic question but I've tried every combination of propedit propset, etc. In an existing project, there's a file (let's call it 'error.log) I want to ignore for all future commits. What's the command-line syntax to do so?

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  • c#: how to send ctrl+z

    - by I__
    how do i convert ctrl+z to a string? i am sending this as an AT COMMAND to an attached device to this computer basically i just to put some chars in a string and ctrl+z in that string as well

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  • require_once file not found in php eclipse project

    - by ldj
    I have a php script that has the following requirement command: require_once 'HTTP/OAuth.php'; the file HTTP/OAuth.php is in php's include_path that is .:/usr/lib/php. Nevertheless in Eclipse the require_once line is marked with the following warning: Include filename: 'HTTP/OAuth.php' doesn't exist in project: How can I make my project see the include_path so it can find the require_once file? Thanks ldj

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  • Can I use php's fwrite with 644 file permissions?

    - by filip
    I am trying to set up automated .htaccess updating. This clearly needs to be as secure as possible, however right now the best I can do file permission-wise is 666. What can I do to setup either my server or php code so that my script's fwrite() command will work with 644 or better? For instance is there a way to set my script(s) to run as owner?

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  • GCommit doesn't work with fugitive.vim under windows xp?

    - by Paul Wicks
    I've just discovered fugitive.vim, which is pretty cool. However, I've run into a problem (this is using windows xp, msys git 1.7, fugitive.vim 1.1, and gvim 7.2). Adding files to the index and checking the status works just fine, but when I do a :GCommit, a command prompt flashes for a second and nothing happens. No way to type a commit message and nothing is committed. Is this a bug? Am I doing something wrong?

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