ui: 'with-paginated-output-port' gives access to the wrapped port.
* guix/ui.scm (pager-port-mapping): New variable. (pager-wrapped-port): New procedure. (call-with-paginated-output-port): Parameterize 'pager-port-mapping'.
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guix/ui.scm
20
guix/ui.scm
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@ -124,6 +124,7 @@ (define-module (guix ui)
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file-hyperlink
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location->hyperlink
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pager-wrapped-port
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with-paginated-output-port
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relevance
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package-relevance
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@ -1665,6 +1666,20 @@ (define (package-relevance package regexps)
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zero means that PACKAGE does not match any of REGEXPS."
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(relevance package regexps %package-metrics))
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(define pager-port-mapping
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;; If a pager is being used, via 'with-paginated-output-port', this maps the
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;; pager port (pipe) to the underlying output port.
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(make-parameter #f))
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(define* (pager-wrapped-port #:optional (port (current-output-port)))
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"If PORT is a pipe to a pager created by 'with-paginated-output-port',
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return the underlying port. Otherwise return #f."
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(match (pager-port-mapping)
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((pager . wrapped)
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(and (eq? pager port) wrapped))
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(_
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#f)))
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(define* (call-with-paginated-output-port proc
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#:key (less-options "FrX"))
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(let ((pager-command-line (or (getenv "GUIX_PAGER")
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@ -1691,7 +1706,10 @@ (define* (call-with-paginated-output-port proc
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char-set:whitespace))))))
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(dynamic-wind
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(const #t)
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(lambda () (proc pager))
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(lambda ()
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(parameterize ((pager-port-mapping
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(cons pager (current-output-port))))
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(proc pager)))
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(lambda () (close-pipe pager))))
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(proc (current-output-port)))))
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