110 lines
4.3 KiB
Scheme
110 lines
4.3 KiB
Scheme
;;; Gash --- Guile As SHell
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;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of Gash.
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;;;
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;;; Gash is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Gash is distributed in the hope that it will be useful, but WITHOUT ANY
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;;; WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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;;; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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;;; details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Gash. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(define-module (gash commands grep)
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#:use-module (ice-9 ftw)
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#:use-module (ice-9 getopt-long)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 regex)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (gash guix-utils)
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#:use-module (gash compress)
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#:use-module (gash config)
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#:use-module (gash io)
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#:use-module (gash ustar)
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#:use-module (gash util)
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#:use-module (gash shell-utils)
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#:export (
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grep
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))
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(define (grep . args)
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(let* ((option-spec
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'((help)
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(line-number (single-char #\n))
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(files-with-matches (single-char #\l))
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(files-without-match (single-char #\L))
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(with-file-name (single-char #\H))
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(no-file-name (single-char #\h))
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(only-matching (single-char #\o))
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(version (single-char #\V))))
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(options (getopt-long args option-spec))
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(help? (option-ref options 'help #f))
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(version? (option-ref options 'version #f))
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(files (option-ref options '() '())))
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(cond (version? (format #t "grep (GASH) ~a\n" %version))
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(help? (display "Usage: grep [OPTION]... PATTERN [FILE]...
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Options:
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--help display this help and exit
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-h, --no-filename suppress the file name prefix on output
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-H, --with-filename print file name with output lines
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-l, --files-with-matches print only names of FILEs with selected lines
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-L, --files-without-match print only names of FILEs with no selected lines
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-n, --line-number print line number with output lines
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-o, --only-matching show only the part of a line matching PATTERN
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-V, --version display version information and exit
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"))
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((null? files) #t)
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(else
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(let* ((pattern (car files))
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(files (if (pair? (cdr files)) (cdr files)
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(list "-")))
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(matches (append-map (cut grep+ pattern <>) files)))
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(define (display-match o)
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(let* ((s (grep-match-string o))
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(s (if (option-ref options 'only-matching #f)
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(substring s (grep-match-column o) (grep-match-end-column o))
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s))
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(s (if (option-ref options 'line-number #f)
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(string-append (number->string (grep-match-line o)) ":" s)
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s))
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(s (if (option-ref options 'with-file-name #f)
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(string-append (grep-match-file-name o) ":" s)
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s)))
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(stdout s)))
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(define (files-with-matches)
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(delete-duplicates (map grep-match-file-name matches)))
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(cond ((option-ref options 'files-with-matches #f)
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(let ((result (files-with-matches)))
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(and (pair? result)
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(for-each stdout result)
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0)))
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((option-ref options 'files-without-match #f)
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(let* ((result (files-with-matches))
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(result (filter (negate (cut member <> result)) files)))
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(and (pair? result)
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(for-each stdout result)
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0)))
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(else
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(and (pair? matches)
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(for-each display-match matches)
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0))))))))
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(define main grep)
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