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PROGRAM:

NAME

makeppbuiltin -- Stand-alone access to builtin commands in makepp

DESCRIPTION

?: -?, A: -A,
--args-file,
--arguments-file, D: $DIRECTNAMEFLAGS, H: -h,
--help, I: -I,
--include,
--include-dir, M: -M,
$MAKEPPBUILTINFLAGS,
--module, V: -V,
--version

makeppbuiltin [ metaoption ... ] command -?|--help

mppb [ metaoption ... ] command -?|--help

makeppbuiltin [ metaoption ... ] command [ option ... ] [ argument ... ]

mppb [ metaoption ... ] command [ option ... ] [ argument ... ]

or

ln makeppbuiltin command

command -?|--help

command [ option ... ] [ argument ... ]

This command allows you to call the builtin commands makepp provides, from outside makepp
as well. This could be necessary if you've installed things with Makeppfile targets that
use &install, but there is no corresponding &uninstall target. Or you need a feature not
usually found in the Unix counterparts like "ln -r". That's what this command is for.

The commands get a simple additional "--help" option, which their builtin counterparts
lack. This works by parsing the command's option declaration. It cannot however find
out, what other arguments the command expects.

The metaoptions allow loading your own command or helper functions, but only if it comes
from a module. Valid options are:

-A filename
--args-file=filename
--arguments-file=filename
Read the file and parse it as possibly quoted whitespace- and/or newline-separated
options.

-?
-h
--help
Print out a brief summary of the options.

-I directory
--include=directory
--include-dir=directory
Add directory to Perl load path @INC.

-M module[=arg,...]
--module=module[=arg,...]
Load module and import any functions it exports.

-V
--version
Print out the version number.

DIRECT CALL

If you like to call such a command more frequently, you can call it directly, by linking
"makeppbuiltin" to the name of that command. The name of the builtin can occur anywhere
within the file-name without directory. So any of the following links would invoke the
builtin "template" command (but the last would need to be escaped from the Shell):

template
template.pl
makepptemplate
templatepp
&template

DIFFERENCES

There are a few notable differences between the usual call within a Makeppfile rule, and a
stand-alone call:

Syntax
Builtin commands are not parsed by the Shell within makepp. There are subtle
differences in how makepp quotes work, e.g. dollar signs are expanded by makepp even
within single quotes, and need to be doubled to escape them. Various characters, like
"*", "&" or "|" are not special to makepp and need not be escaped.

Difference: To start the command stand-alone you are probably using a Shell. Here you
must adapt such special cases to the syntactical requirements of the Shell.

Variables and Functions
Before makepp executes the rule actions, they will already have undergone expression
expansion of makepp variables and functions.

Difference: When called from the Shell, you will instead get unprotected Shell
variables and expressions expanded, before the comand is called.

Perl Code
Each Makeppfile lives in its own (anonymous) Perl package. Anything you do therein is
available when running builtin commands. For example, you can set variables or define
functions, and use them within the Perl code of those commands that accept it.

Difference: In stand-alone usage there is no such context. Everything you need, must
be in the Perl code you pass the command, or in modules you use.

ENVIRONMENT

Makeppbuiltin looks at the following environment variables:

$MAKEPPBUILTINFLAGS
Any flags in this environment variable are interpreted as command line options before
any explicit options. Quotes are interpreted like in makefiles.

$DIRECTNAMEFLAGS
This variable is used instead of $MAKEPPBUILTINFLAGS when makeppbuiltin is linked to
directname as explained under "DIRECT CALL".

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