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shell: add "loop hook"
This hook is called during every iteration, allowing regular screen refresh when video is involved.
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@ -56,7 +56,9 @@
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; Pointer to a hook to call when a cmd name isn't found
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.equ SHELL_CMDHOOK SHELL_BUF+SHELL_BUFSIZE
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.equ SHELL_RAMEND SHELL_CMDHOOK+2
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; Pointer to a routine to call at each shell loop interation
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.equ SHELL_LOOPHOOK SHELL_CMDHOOK+2
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.equ SHELL_RAMEND SHELL_LOOPHOOK+2
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; *** CODE ***
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shellInit:
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@ -66,6 +68,7 @@ shellInit:
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ld (SHELL_BUF), a
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ld hl, noop
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ld (SHELL_CMDHOOK), hl
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ld (SHELL_LOOPHOOK), hl
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; print welcome
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ld hl, .welcome
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@ -77,7 +80,10 @@ shellInit:
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; Inifite loop that processes input. Because it's infinite, you should jump
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; to it rather than call it. Saves two precious bytes in the stack.
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shellLoop:
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; First, let's wait until something is typed.
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; First, call the loop hook
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ld ix, (SHELL_LOOPHOOK)
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call callIX
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; Then, let's wait until something is typed.
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call stdioGetC
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jr nz, shellLoop ; nothing typed? loop
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; got it. Now, is it a CR or LF?
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