Here's my Library loader script:
use [Patches Files Provided Do_Script Defer_Script Script Header
Requires Provides] [
do Patches: %Patches.r
Files: exclude read %./ reduce [Rebol/script/header/File
Patches]
Provided: make block! 100
Do_Script: [
do Script
if all [
not none? Provides
Provides: get Provides
any [
word? Provides
block? Provides
]
] [
insert tail Provided Provides
]
true
]
foreach File Files [
Defer_Script: [
insert/only tail Files Script
]
Script: any [
if block? File [
File
]
if all [
file? File
found? find/last File %.r
] [
load/header File
]
]
if Script [
Header: first Script
Requires: in Header 'Requires
Provides: in Header 'Provides
any [
if none? Requires Do_Script
if word? Requires: get Requires [
either found? find Provided
Requires Do_Script Defer_Script
]
if block? Requires [
either empty? exclude Requires
Provided Do_Script Defer_Script
]
]
]
]
]
It examines each script's header for the 'Requires and 'Provides fields,
like (from my ML.r %script):
Requires: [Build-Tag Push Pop]
Provides: [ML]
It doesn't attempt to do any versioning or downloading, just 'load-s and
'do-es scripts so that scripts that require words defined are 'do-ne
after scripts that provide values for those words. For the above
example, the files that provide 'Build-Tag, 'Push & 'Pop are 'do-ne
before the file containing a value for 'ML.
One problem the above script has, it that if a script requires a value
for a word that no other script provides, the above function never
returns. I haven't figured out a solution for this. Can anyone think of
one?
Andrew J Martin
Attendance Officer
Speaking in tongues and performing miracles.
Colenso High School
Arnold Street, Napier.
Tel: 64-6-8310180 ext 826
Fax: 64-6-8336759
http://colenso.net/scripts/Wiki.r?AJM
http://www.colenso.school.nz/
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