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42 lines
1.4 KiB
Markdown
42 lines
1.4 KiB
Markdown
# CMD executable PATH for ProDOS's BASIC.SYSTEM
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[](https://travis-ci.org/a2stuff/prodos-path)
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Build with [ca65](https://cc65.github.io/doc/ca65.html)
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Installation:
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* Copy target to ProDOS disk
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* From BASIC.SYSTEM prompt, run: `-PATH` from STARTUP (or by hand)
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Usage:
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```
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PATH prefix - set search path(s) - colon delimited
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PATH - view current search path(s)
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cmdname - load and execute named CMD, if in PATH
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```
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Once set, binary files of type `CMD` in the specified directories can be invoked by name.
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* CMD file is loaded at $4000 and invoked; should return (`rts`) on completion.
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* The command line will be present at $200 (`GETLN` input buffer).
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* Supports multi-segment, colon-separated paths, e.g. `/hd/cmds:/hd2/more.cmds`
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Example:
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```
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] -/hd/path - install it
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] PATH /hd/cmds:/h2/bin - set PATH
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] PATH - verify path
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/hd/cmds
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] BELL - will invoke /hd/cmds/BELL if present
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] HELLO - will invoke /hd/cmds/HELLO if present
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```
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Notes:
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* Allocates a permanent buffer to store the code and path (2 pages)
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* Can be invoked as lower case (e.g. `path ...`)
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* Applesoft BASIC commands are unaffected (but can't be CMD names)
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* Search order when a command is typed:
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* ProDOS BASIC.SYSTEM intrinsics (`CAT`, `PREFIX`, etc)
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* AppleSoft keywords (`LIST`, `PRINT`, etc)
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* CMD files in paths, in listed order
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