200 lines
7.5 KiB
Scheme
200 lines
7.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2017, 2018 Ludovic Courtès <ludo@gnu.org>
|
|
;;;
|
|
;;; This file is part of GNU Guix.
|
|
;;;
|
|
;;; GNU Guix is free software; you can redistribute it and/or modify it
|
|
;;; under the terms of the GNU General Public License as published by
|
|
;;; the Free Software Foundation; either version 3 of the License, or (at
|
|
;;; your option) any later version.
|
|
;;;
|
|
;;; GNU Guix is distributed in the hope that it will be useful, but
|
|
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;;; GNU General Public License for more details.
|
|
;;;
|
|
;;; You should have received a copy of the GNU General Public License
|
|
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
(define-module (guix man-db)
|
|
#:use-module (guix zlib)
|
|
#:use-module ((guix build utils) #:select (find-files))
|
|
#:use-module (gdbm) ;gdbm-ffi
|
|
#:use-module (srfi srfi-9)
|
|
#:use-module (srfi srfi-26)
|
|
#:use-module (ice-9 match)
|
|
#:use-module (ice-9 rdelim)
|
|
#:use-module (ice-9 regex)
|
|
#:export (mandb-entry?
|
|
mandb-entry-file-name
|
|
mandb-entry-name
|
|
mandb-entry-section
|
|
mandb-entry-synopsis
|
|
mandb-entry-kind
|
|
|
|
mandb-entries
|
|
write-mandb-database))
|
|
|
|
;;; Comment:
|
|
;;;
|
|
;;; Scan gzipped man pages and create a man-db database. The database is
|
|
;;; meant to be used by 'man -k KEYWORD'.
|
|
;;;
|
|
;;; The implementation here aims to be simpler than that of 'man-db', and to
|
|
;;; produce deterministic output. See <https://bugs.gnu.org/29654>.
|
|
;;;
|
|
;;; Code:
|
|
|
|
(define-record-type <mandb-entry>
|
|
(mandb-entry file-name name section synopsis kind)
|
|
mandb-entry?
|
|
(file-name mandb-entry-file-name) ;e.g., "../abiword.1.gz"
|
|
(name mandb-entry-name) ;e.g., "ABIWORD"
|
|
(section mandb-entry-section) ;number
|
|
(synopsis mandb-entry-synopsis) ;string
|
|
(kind mandb-entry-kind)) ;'ultimate | 'link
|
|
|
|
(define (mandb-entry<? entry1 entry2)
|
|
(match entry1
|
|
(($ <mandb-entry> file1 name1 section1)
|
|
(match entry2
|
|
(($ <mandb-entry> file2 name2 section2)
|
|
(or (< section1 section2)
|
|
(string<? (basename file1) (basename file2))))))))
|
|
|
|
(define abbreviate-file-name
|
|
(let ((man-file-rx (make-regexp "(.+)\\.[0-9][a-z]?(\\.gz)?$")))
|
|
(lambda (file)
|
|
(match (regexp-exec man-file-rx (basename file))
|
|
(#f
|
|
(basename file))
|
|
(matches
|
|
(match:substring matches 1))))))
|
|
|
|
(define (entry->string entry)
|
|
"Return the wire format for ENTRY as a string."
|
|
(match entry
|
|
(($ <mandb-entry> file name section synopsis kind)
|
|
;; See db_store.c:make_content in man-db for the format.
|
|
(string-append (abbreviate-file-name file) "\t"
|
|
(number->string section) "\t"
|
|
(number->string section)
|
|
|
|
;; Timestamp that we always set to the epoch.
|
|
"\t0\t0"
|
|
|
|
;; See "db_storage.h" in man-db for the different kinds.
|
|
"\t"
|
|
(case kind
|
|
((ultimate) "A") ;ultimate man page
|
|
((link) "B") ;".so" link to other man page
|
|
(else "A")) ;something that doesn't matter much
|
|
|
|
"\t-\t-\t"
|
|
|
|
(if (string-suffix? ".gz" file) "gz" "")
|
|
"\t"
|
|
|
|
synopsis "\x00"))))
|
|
|
|
;; The man-db schema version we're compatible with.
|
|
(define %version-key "$version$\x00")
|
|
(define %version-value "2.5.0\x00")
|
|
|
|
(define (write-mandb-database file entries)
|
|
"Write ENTRIES to FILE as a man-db database. FILE is usually
|
|
\".../index.db\", and is a GDBM database."
|
|
(let ((db (gdbm-open file GDBM_WRCREAT)))
|
|
(gdbm-set! db %version-key %version-value)
|
|
|
|
;; Write ENTRIES in sorted order so we get deterministic output.
|
|
(for-each (lambda (entry)
|
|
(gdbm-set! db
|
|
(string-append (mandb-entry-file-name entry)
|
|
"\x00")
|
|
(entry->string entry)))
|
|
(sort entries mandb-entry<?))
|
|
(gdbm-close db)))
|
|
|
|
(define (read-synopsis port)
|
|
"Read from PORT a man page synopsis."
|
|
(define (section? line)
|
|
;; True if LINE starts with ".SH", ".PP", or so.
|
|
(string-prefix? "." (string-trim line)))
|
|
|
|
(define (extract-synopsis str)
|
|
(match (string-contains str "\\-")
|
|
(#f "")
|
|
(index
|
|
(string-map (match-lambda
|
|
(#\newline #\space)
|
|
(chr chr))
|
|
(string-trim-both (string-drop str (+ 2 index)))))))
|
|
|
|
;; Synopses look like "Command \- Do something.", possibly spanning several
|
|
;; lines.
|
|
(let loop ((lines '()))
|
|
(match (read-line port 'concat)
|
|
((? eof-object?)
|
|
(extract-synopsis (string-concatenate-reverse lines)))
|
|
((? section?)
|
|
(extract-synopsis (string-concatenate-reverse lines)))
|
|
(line
|
|
(loop (cons line lines))))))
|
|
|
|
(define* (man-page->entry file #:optional (resolve identity))
|
|
"Parse FILE, a gzipped man page, and return a <mandb-entry> for it."
|
|
(define (string->number* str)
|
|
(if (and (string-prefix? "\"" str)
|
|
(> (string-length str) 1)
|
|
(string-suffix? "\"" str))
|
|
(string->number (string-drop (string-drop-right str 1) 1))
|
|
(string->number str)))
|
|
|
|
;; Note: This works for both gzipped and uncompressed files.
|
|
(call-with-gzip-input-port (open-file file "r0")
|
|
(lambda (port)
|
|
(let loop ((name #f)
|
|
(section #f)
|
|
(synopsis #f)
|
|
(kind 'ultimate))
|
|
(if (and name section synopsis)
|
|
(mandb-entry file name section synopsis kind)
|
|
(let ((line (read-line port)))
|
|
(if (eof-object? line)
|
|
(mandb-entry file name (or section 0) (or synopsis "")
|
|
kind)
|
|
(match (string-tokenize line)
|
|
((".TH" name (= string->number* section) _ ...)
|
|
(loop name section synopsis kind))
|
|
((".SH" (or "NAME" "\"NAME\""))
|
|
(loop name section (read-synopsis port) kind))
|
|
((".so" link)
|
|
(match (and=> (resolve link)
|
|
(cut man-page->entry <> resolve))
|
|
(#f
|
|
(loop name section synopsis 'link))
|
|
(alias
|
|
(mandb-entry file
|
|
(mandb-entry-name alias)
|
|
(mandb-entry-section alias)
|
|
(mandb-entry-synopsis alias)
|
|
'link))))
|
|
(_
|
|
(loop name section synopsis kind))))))))))
|
|
|
|
(define (man-files directory)
|
|
"Return the list of man pages found under DIRECTORY, recursively."
|
|
;; Filter the list to ensure that broken symlinks are excluded.
|
|
(filter file-exists? (find-files directory "\\.[0-9][a-z]?(\\.gz)?$")))
|
|
|
|
(define (mandb-entries directory)
|
|
"Return mandb entries for the man pages found under DIRECTORY, recursively."
|
|
(map (lambda (file)
|
|
(man-page->entry file
|
|
(lambda (link)
|
|
(let ((file (string-append directory "/" link
|
|
".gz")))
|
|
(and (file-exists? file) file)))))
|
|
(man-files directory)))
|