69 lines
2.2 KiB
Scheme
69 lines
2.2 KiB
Scheme
#| -*-Scheme-*-
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Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
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1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
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2017, 2018, 2019, 2020 Massachusetts Institute of Technology
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This file is part of MIT/GNU Scheme.
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MIT/GNU Scheme is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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MIT/GNU Scheme is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with MIT/GNU Scheme; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
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USA.
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|#
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;;;; String Padding Stuff
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(define (pad-on-right-to string n)
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(let ((l (string-length string)))
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(if (> n l)
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(let ((result (string-allocate n)))
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(substring-move-right! string 0 l result 0)
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(substring-fill! result l n #\space)
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result)
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string)))
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(define (pad-on-left-to string n)
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(let ((l (string-length string)))
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(let ((delta (- n l)))
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(if (positive? delta)
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(let ((result (string-allocate n)))
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(substring-fill! result 0 delta #\space)
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(substring-move-right! string 0 l result delta)
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result)
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string))))
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(define (write-strings-densely strings #!optional port x-size)
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(let ((port (if (default-object? port) (current-output-port) port))
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(n (reduce max 0 (map string-length strings))))
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(let ((x-size
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(if (default-object? x-size) (output-port/x-size port) x-size)))
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(let ((n-per-line (max 1 (quotient (+ x-size 1) (+ 2 n)))))
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(if (not (null? strings))
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(let loop ((strings strings) (i 0))
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(write-string (pad-on-right-to (car strings) n) port)
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(let ((strings (cdr strings))
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(i (+ i 1)))
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(if (not (null? strings))
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(if (< i n-per-line)
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(begin
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(write-string " " port)
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(loop strings i))
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(begin
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(newline port)
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(loop strings 0)))))))))))
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