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(defun maproc-impl (cmd-lambda put-expr get-expr) (tree-bind (pipe-rd . pipe-wr) (pipe) (with-stream (cmd-stdout (open-fileno pipe-wr "w")) (with-stream (cmd-out (open-fileno pipe-rd "r")) (match-case (fork) (0 (close-stream cmd-out) (with-stream (cmd-in (let ((*stdout* cmd-stdout)) [cmd-lambda])) [put-expr cmd-in]) (exit* 0)) (nil (error "fork failed")) (@pid (close-stream cmd-stdout) (let ((out [get-expr cmd-out])) (wait pid) out))))))) (defun map-command-lines (command lines) (maproc-impl (lambda () (open-command command "w")) (lambda (strm) (put-lines lines strm)) (lambda (strm) (let ((lines (get-lines strm))) (prog1 lines (len lines)))))) (defun map-command-str (command str) (maproc-impl (lambda () (open-command command "w")) (lambda (strm) (put-string str strm)) (lambda (strm) (get-string strm)))) (defun map-process-lines (program args lines) (maproc-impl (lambda () (open-process program "w" args)) (lambda (strm) (put-lines lines strm)) (lambda (strm) (let ((lines (get-lines strm))) (prog1 lines (len lines)))))) (defun map-process-str (program args str) (maproc-impl (lambda () (open-process program "w" args)) (lambda (strm) (put-string str strm)) (lambda (strm) (get-string strm)))) (prinl (map-command-lines "tr '[a-z]' '[A-Z]'" '#"a b c")) (prinl (map-process-lines "tr" '#"[a-z] [A-Z]" '#"a b c")) (prinl (map-command-str "tr '[a-z]' '[A-Z]'" "abc")) (prinl (map-process-str "tr" '#"[a-z] [A-Z]" "abc"))