Extensive changes to support multiple xscheme buffers:
(run-scheme): Break up into new functions to facilitate starting processes in other buffers. (xscheme-start, xscheme-read-command-line): New functions. (start-scheme, select-scheme) (default-xscheme-runlight) (global-set-scheme-interaction-buffer) (local-set-scheme-interaction-buffer) (local-clear-scheme-interaction-buffer) (exit-scheme-interaction-mode) (verify-xscheme-buffer): New functions. (xscheme-process-name, xscheme-buffer-name) (xscheme-runlight): New internal vars. (default-xscheme-runlight): New const. (xscheme-start-process): Add args for the process/buffer names. (reset-scheme): Pass process/buffer names. (scheme-interaction-mode): Initialize new local vars. (reset-scheme, xscheme-send-string-2, xscheme-process-running-p) (xscheme-select-process-buffer, xscheme-process-buffer) (xscheme-send-region, xscheme-send-char, xscheme-send-interrupt) (xscheme-goto-output-point, xscheme-write-message-1): Use new var xscheme-process-name. (xscheme-start-process): Initialize xscheme-process-name and xscheme-buffer-name in the process buffer. Pass buffer name to xscheme-modeline-initialize. (xscheme-modeline-initialize): Add argument to specify buffer name for mode-line vars. (xscheme-process-sentinel): Make sure sentinel is run in the process buffer so it sees its local vars. (xscheme-process-filter-initialize, xscheme-set-runlight): More elaborate logic to handle multiple-buffer mode lines. (xscheme-enter-input-wait): Re-enable control-G handler upon entering input wait. (scheme-interaction-mode): Add arg to preserve local vars. (xscheme-enter-interaction-mode) (xscheme-enter-debugger-mode): Preserve local vars. (xscheme-start-process): Clobber local vars. (scheme-interaction-mode-commands): Allow end user to add commands to scheme-interaction-mode keymap. (scheme-interaction-mode-commands-alist): New variable. (xscheme-send-string): Don't use insert-before-markers. Implement a per-buffer kill ring: (xscheme-insert-expression) (xscheme-rotate-yank-pointer, xscheme-yank) (xscheme-yank-pop, xscheme-yank-push): New functions. (xscheme-expressions-ring) (xscheme-expressions-ring-yank-pointer) (xscheme-expressions-ring-max): New variables. (xscheme-send-string-1): Call xscheme-insert-expression to save expression in ring. (xscheme-yank-previous-send): Now an alias for xscheme-yank. (xscheme-previous-send): Deleted variable. (xscheme-send-string-2, xscheme-send-char, xscheme-send-proceed, xscheme-send-control-g-interrupt): Use process-send-string rather than send-string. (xscheme-send-region): Insert a newline after an expression that is submitted in the interaction buffer, for consistency with recent changes to Edwin. (xscheme-delete-output): New function mimics comint-delete-output. (xscheme-last-input-end): New internal variable. (xscheme-process-filter-output): Update xscheme-last-input-end. (xscheme-send-control-g-interrupt): Make sure that xscheme-control-g-disabled-p is looked up in the right buffer. (xscheme-enable-control-g): Clear C-g message if visible. (xscheme-control-g-message-string): New internal var. (xscheme-send-control-g-interrupt): Use new var. (xscheme-send-control-g-interrupt, xscheme-send-interrupt): Delay after sending interrupt in order to work around race condition. (xscheme-send-control-g-interrupt, xscheme-send-interrupt) (xscheme-send-char): Use xscheme-send-char rather than send-string to send single char. (xscheme-process-filter, xscheme-process-filter-alist): Add support for evaluating expressions outside of the call-excursion. (xscheme-process-filter:string-action-noexcursion): New func. (xscheme-write-value): Change output string to match that used by Edwin. (xscheme-coerce-prompt): Don't write a space after a command prompt. The PROMPT-FOR-COMMAND- procedures will take care of this for us. (reset-scheme): Delete process after killing it.
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