(guile.info.gz) Intro to Using Guile Modules

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(guile.info.gz) Intro to Writing New Modules

 
 5.5.1 Intro to Using Existing Modules
 -------------------------------------
 
 Guile comes with a lot of useful modules, for example for string
 processing or command line parsing.  Additionally, there exist many
 Guile modules written by other Guile hackers, but which have to be
 installed manually.
 
    Existing modules have to be placed in places where Guile looks for
 them by default or in colon-separated directories in the environment
 variable `GUILE_LOAD_PATH'.  When this variable is set, those
 directories are searched first, then the the default.  The following
 command shows the complete list of directories searched:
 
      guile -c '(write %load-path) (newline)'
 
    Suppose you want to use the procedures and variables exported by the
 module `(ice-9 popen)', which provides the means for communicating with
 other processes over pipes.  Add the following line to your currently
 running Guile REPL or the top of your script file.
 
      (use-modules (ice-9 popen))
 
    This will load the module and make the procedures exported by
 `(ice-9 popen)' automatically available.  The next step could be to
 open a pipe to `ls' and read the contents of the current directory, one
 line at a time.
 
      (define p (open-input-pipe "ls -l"))
      (read-line p)
      =>
      "total 30"
      (read-line p)
      =>
      "drwxr-sr-x    2 mgrabmue mgrabmue     1024 Mar 29 19:57 CVS"
 

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(guile.info.gz) Guile Modules

(guile.info.gz) Intro to Writing New Modules