92 lines
2.6 KiB
Scheme
92 lines
2.6 KiB
Scheme
;; some helpers for the implementation of completion functions
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;; it's a hack
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(define (syscall-error? thing)
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(and (pair? thing)
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(eq? (condition-type thing) 'syscall-error)))
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(define (glob-carefully pattern)
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(call-with-current-continuation
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(lambda (esc)
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(with-handler
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(lambda (c more)
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(if (syscall-error? c)
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(esc '())
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(more)))
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(lambda ()
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(glob pattern))))))
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(define (files-in-dir file-filter dir)
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(debug-message "files-in-dir " file-filter " " dir)
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(filter-map file-filter
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(glob-carefully (string-append dir "*"))))
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(define (complete-path path)
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(debug-message "complete-path " path ", " (cwd))
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(let ((dir (file-name-directory path)))
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(glob-carefully (string-append path "*"))))
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(define (file-exists-and-is-directory? fname)
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(call-with-current-continuation
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(lambda (esc)
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(with-handler
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(lambda (c more)
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(if (error? c)
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(esc #f)
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(more)))
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(lambda ()
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(and (file-exists? fname) (file-directory? fname)))))))
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(define (complete-with-filesystem-objects filter partial-name)
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(debug-message "complete-with-filesystem-objects " filter " " partial-name)
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(if (and (file-name-directory? partial-name)
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(file-exists-and-is-directory? partial-name))
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(files-in-dir filter partial-name)
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(filter-map filter (complete-path partial-name))))
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(define (make-completer-for-file-with-extension extensions)
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(lambda (command to-complete)
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(complete-with-filesystem-objects
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(lambda (file)
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(and (member (file-name-extension file) extensions)
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file))
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(or (to-complete-prefix to-complete) (cwd)))))
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(define (complete-executables/path partial-name)
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(complete-with-filesystem-objects
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(lambda (file)
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(call-with-current-continuation
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(lambda (esc)
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(with-handler
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(lambda (c more)
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(if (error? c)
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(esc #f)
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(more)))
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(lambda ()
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(and (or (file-executable? file) (file-directory? file))
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file))))))
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partial-name))
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;; completion functions for arguments and redirection
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(define (find-completions-for-arg cmd to-complete)
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(debug-message "find-completions-for-arg " cmd "," to-complete)
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(let ((prefix (to-complete-prefix to-complete)))
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(complete-with-filesystem-objects
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(lambda (file)
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(call-with-current-continuation
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(lambda (esc)
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(with-handler
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(lambda (c more)
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(if (error? c)
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(esc #f)
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(more)))
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(lambda ()
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(if (file-directory? file)
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(file-name-as-directory file)
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file))))))
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(or (to-complete-prefix to-complete) (cwd)))))
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;; #### no special treatment yet
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(define find-completions-for-redir find-completions-for-arg)
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