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Loading packages in your Tcl program

In Tcl, extra bundles of code can be loaded from packages which are files of more ... brought in with package require from a folder that's listed in the auto_path variable.

Packages are defined with a package provide in the source code of the package which must be indexed in a file called pkgIndex.tcl. Failure to index will result in Tcl failing to find the package. There's a built in Tcl command called pkg_mkIndex which allows you to generate the index automatically.

Namespaces are technically different to packages, but it'c common practise to define a package in a Tcl namespace to avoid any risk of conflicting names of procedures, and to make it clearer for the maintenance programmer later on to know what's loaded from where.

Example of a program that loads packages - [here]. The packages it loads are [here] (without a namespace and [here] for one with a namespace

(written 2015-10-09)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T213 - Tcl/Tk - Libraries, Packages and Namespaces
  [3418] Tcl packages, pkg_mkIndex, pkgIndex.tcl -what are they and why use them. - (2011-09-03)
  [3417] What is a namespace and why do we need them? - (2011-09-03)
  [3066] Separating groups of variables into namespaces - (2010-11-24)
  [2476] Tcl - uplevel to run code at calling level - (2009-10-24)
  [1529] Tcl - learning how to use namespaces, packages and libraries together - (2008-02-02)
  [1339] Packages and Namespaces are like Suitcases and Aircraft - (2007-09-09)
  [146] example of Tcl namespaces and packages - (2004-12-10)


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