lesspipe

Tout d'abord, je signale que ~/.lessfilter ça ne fonctionne que sous debian.

lesspipe regarde le contenu de la variable LESSOPEN. Logiquement, on créé un script lesspipe qui renvoie ses variables lorsqu'on l'exécute sans argument :

$ lesspipe
export LESSOPEN="| /usr/bin/lesspipe %s";
export LESSCLOSE="/usr/bin/lesspipe %s %s";

D'où le eval $(lesspipe) pour l'activer. Il se trouve que le lesspipe fourni par debian cherche un fichier ~/.lessfilter, ce qui permet à chaque utilisateur d'avoir son script perso. Mais ce n'est pas le cas sous toutes les distribs.

Pour ma part, j'ai refait un lesspipe à ma sauce, d'abord inspiré de ceux trouvés dans les distribs que j'ai utilisés, puis alimenté au fur et à mesure des fichiers que j'ai voulu lire avec less. Le voici aujourd'hui :

#!/bin/sh
# input preprocessor for less
# print LESSOPEN variable, when called without args
# (use it with absolute path)
if [ $# -eq 0 ]; then
 echo "LESSOPEN=\"|0ドル %s\""
 echo "LESSCHARSET=utf-8"
 if env | grep -q '^LESS=' ; then
 if ! echo $LESS | grep -q '\-R' ; then
 echo "LESS=\"-R $LESS\""
 fi
 else
 echo "LESS=-R"
 fi
 echo "export LESS LESSOPEN LESSCHARSET"
 exit
fi
# Check usage
if [ $# -gt 1 ]; then
 echo "Usage: Don't use it directly"
 echo 'Launch "eval $(/path/to/lesspipe.sh)" to use it with less'
fi
# We just determine file type of 1ドル
# and determine which viewer is appropriate
case "$(file -Lb "1ドル")" in
# Folder
directory)
 ls -la "1ドル" 2>/dev/null ;;
# Archive
POSIX[[:space:]]tar[[:space:]]archive*)
 tar tvvf "1ドル" 2>/dev/null ;;
gzip[[:space:]]compressed[[:space:]]data*) # Test if tar or man 
 if gzip -dc "1ドル" | file - | grep -q 'tar archive' ; then
 tar tvvf "1ドル" 2>/dev/null
 elif gzip -dc "1ドル" | file - | grep -q 'roff' ; then
 gzip -dc "1ドル" | nroff -S -mandoc -
 else
 gzip -dc "1ドル" 2>/dev/null
 fi ;;
bzip2[[:space:]]compressed[[:space:]]data*)
 if bzip2 -dc "1ドル" | file - | grep -q 'tar archive' ; then
 tar tvvf "1ドル" 2>/dev/null
 elif bzip2 -dc "1ドル" | file - | grep -q 'roff' ; then
 bzip2 -dc "1ドル" | nroff -S -mandoc -
 else
 bzip2 -dc "1ドル" 2>/dev/null
 fi ;;
cpio[[:space:]]archive)
 which cpio >/dev/null && cpio -it < "1ドル" 2>/dev/null ;;
[Xx][Zz][[:space:]]compressed[[:space:]]data*)
 if xz -dc "1ドル" | file - | grep 'tar archive' ; then
 xz -dc "1ドル" | tar tvvf - 2>/dev/null
 else
 xz -dc "1ドル" 2>/dev/null
 fi ;;
data) # Test if lzma archive
 if xz -t "1ドル" ; then
 if xz -F lzma -dc "1ドル" | file - | grep 'tar archive' ; then
 xz -F lzma -dc "1ドル" | tar tvvf - 2>/dev/null
 else
 xz -F lzma -dc "1ドル" 2>/dev/null
 fi
 else
 echo "Unrecognized file"
 fi ;;
ISO[[:space:]]9660[[:space:]]CD-ROM[[:space:]]filesystem[[:space:]]data*)
 if which isoinfo >/dev/null ; then
 echo "1ドル:" ; isoinfo -d -i "1ドル"
 echo
 echo '***Contents:' ; isoinfo -f -i "1ドル"
 fi ;;
Zip[[:space:]]archive[[:space:]]data*)
 unzip -l "1ドル" 2>/dev/null ;;
RAR[[:space:]]archive[[:space:]]data*)
 which unrar >/dev/null && unrar l "1ドル" 2>/dev/null ;;
# Distributions Packages
Debian[[:space:]]binary[[:space:]]package*)
 if which dpkg >/dev/null ; then
 echo "1ドル:" ; dpkg --info "1ドル"
 echo
 echo '*** Contents:' ; dpkg-deb --contents "1ドル"
 else
 ar p "1ドル" data.tar.gz | tar tzvf -
 fi ;;
RPM*)
 if which rpm >/dev/null ; then
 echo "1ドル:" ; rpm -q -i -p "1ドル"
 echo
 echo '*** Contents:' ; rpm -q -l -p "1ドル"
 elif which rpm2cpio >/dev/null ; then
 rpm2cpio "1ドル" | cpio -it
 elif which rpm2tar >/dev/null ; then
 rpm2tar -O "1ドル" | tar tvf -
 fi ;;
# Printable documents
PDF[[:space:]]document*)
 which pdftotext >/dev/null && pdftotext "1ドル" - 2>/dev/null ;;
PostScript[[:space:]]document*)
 if which pdftotext >/dev/null && which ps2pdf >/dev/null ; then
 ps2pdf "1ドル" > /tmp/less-$$ 2>/dev/null
 pdftotext /tmp/less-$$ - 2>/dev/null
 rm -f /tmp/less-$$
 fi ;;
TeX[[:space:]]DVI[[:space:]]file*)
 which dvi2tty >/dev/null && dvi2tty "1ドル" >/dev/null ;;
# Editable documents
LaTeX*document[[:space:]]text)
 which highlight >/dev/null && highlight -S tex -O ansi "1ドル" 2>/dev/null ;;
HTML[[:space:]]document[[:space:]]text)
 which highlight >/dev/null && highlight -S html -O ansi "1ドル" 2>/dev/null ;;
OpenDocument[[:space:]]Text)
 which odt2txt >/dev/null && odt2txt "1ドル" 2>/dev/null ;;
CDF[[:space:]]V2[[:space:]]Document*) # MS Office document
 if echo "1ドル" | grep -q '\.doc$' ; then
 which catdoc >/dev/null && catdoc "1ドル" 2>/dev/null
 elif echo "1ドル" | grep -q '\.xls$' ; then
 which xls2csv >/dev/null && xls2csv "1ドル" 2>/dev/null
 fi ;;
troff*)
 nroff -S -mandoc "1ドル" 2>/dev/null ;;
# text
*[Pp]erl*script*text*)
 if which pygmentize >/dev/null ; then
 pygmentize -l pl "1ドル" 2>/dev/null
 elif which highlight >/dev/null ; then
 highlight -S perl -O ansi "1ドル" 2>/dev/null
 fi ;;
*[Pp]ython*script*text*)
 if which pygmentize >/dev/null ; then
 pygmentize -l py "1ドル" 2>/dev/null
 elif which highlight >/dev/null ; then
 highlight -S python -O ansi "1ドル" 2>/dev/null
 fi ;;
*sh*script*text*)
 if which pygmentize >/dev/null ; then
 pygmentize -l sh "1ドル" 2>/dev/null
 elif which highlight >/dev/null ; then
 highlight -S Bash -O ansi "1ドル" 2>/dev/null
 fi ;;
*[Pp]ython*script*text*)
 if which pygmentize >/dev/null ; then
 pygmentize -l py "1ドル" 2>/dev/null
 elif which highlight >/dev/null ; then
 highlight -S Bash -O ansi "1ドル" 2>/dev/null
 fi ;;
*[pP][hH][pP]*script*text*)
 if which pygmentize >/dev/null ; then
 pygmentize -l php "1ドル" 2>/dev/null
 elif which highlight >/dev/null ; then
 highlight -S php -O ansi "1ドル" 2>/dev/null
 fi ;;
*C*program*text)
 if which pygmentize >/dev/null ; then
 pygmentize -l c "1ドル" 2>/dev/null
 elif which highlight >/dev/null ; then
 highlight -S c -O ansi "1ドル" 2>/dev/null
 fi ;;
*text)
 if echo "1ドル" | grep -q 'Makefile' ; then
 if which pygmentize >/dev/null ; then
 pygmentize -l make "1ドル" 2>/dev/null
 elif which highlight >/dev/null ; then
 highlight -S make -O ansi "1ドル" 2>/dev/null
 fi
 else
 cat "1ドル" 2>/dev/null
 fi ;;
# Images
JPEG[[:space]]image[[:space:]]data*)
 which identify >/dev/null && identify "1ドル" 2>/dev/null
 which jp2a >/dev/null && jp2a --color "1ドル" 2>/dev/null ;;
*image[[:space:]]data*)
 which identify >/dev/null && identify "1ドル" 2>/dev/null
 which jp2a >/dev/null && convert "1ドル" jpg:- 2>/dev/null | jp2a --color - 2>/dev/null ;;
# Others
# *)
# cat "1ドル" ;;
esac