ranger/scope.sh

   1 #!/usr/bin/env sh
   2 # ranger supports enhanced previews.  If the option "use_preview_script"
   3 # is set to True and this file exists, this script will be called and its
   4 # output is displayed in ranger.  ANSI color codes are supported.
   5
   6 # NOTES: This script is considered a configuration file.  If you upgrade
   7 # ranger, it will be left untouched. (You must update it yourself.)
   8 # Also, ranger disables STDIN here, so interactive scripts won't work properly
   9
  10 # Meanings of exit codes:
  11 # code | meaning    | action of ranger
  12 # -----+------------+-------------------------------------------
  13 # 0    | success    | success. display stdout as preview
  14 # 1    | no preview | failure. display no preview at all
  15 # 2    | plain text | display the plain content of the file
  16 # 3    | fix width  | success. Don't reload when width changes
  17 # 4    | fix height | success. Don't reload when height changes
  18 # 5    | fix both   | success. Don't ever reload
  19 # 6    | image      | success. display the image $cached points to as an image preview
  20 # 7    | image      | success. display the file directly as an image
  21
  22 # Meaningful aliases for arguments:
  23 path="$1"            # Full path of the selected file
  24 width="$2"           # Width of the preview pane (number of fitting characters)
  25 height="$3"          # Height of the preview pane (number of fitting characters)
  26 cached="$4"          # Path that should be used to cache image previews
  27 preview_images="$5"  # "True" if image previews are enabled, "False" otherwise.
  28
  29 maxln=200    # Stop after $maxln lines.  Can be used like ls | head -n $maxln
  30
  31 # Find out something about the file:
  32 mimetype=$(file --mime-type -Lb "$path")
  33 extension=$(/bin/echo "${path##*.}" | awk '{print tolower($0)}')
  34
  35 # Functions:
  36 # runs a command and saves its output into $output.  Useful if you need
  37 # the return value AND want to use the output in a pipe
  38 try() { output=$(eval '"$@"'); }
  39
  40 # writes the output of the previously used "try" command
  41 dump() { /bin/echo "$output"; }
  42
  43 # a common post-processing function used after most commands
  44 trim() { head -n "$maxln"; }
  45
  46 # wraps highlight to treat exit code 141 (killed by SIGPIPE) as success
  47 safepipe() { "$@"; test $? = 0 -o $? = 141; }
  48
  49 # Image previews, if enabled in ranger.
  50 if [ "$preview_images" = "True" ]; then
  51     case "$mimetype" in
  52         # Image previews for SVG files, disabled by default.
  53         ###image/svg+xml)
  54         ###   convert "$path" "$cached" && exit 6 || exit 1;;
  55         # Image previews for image files. w3mimgdisplay will be called for all
  56         # image files (unless overriden as above), but might fail for
  57         # unsupported types.
  58         image/*)
  59             exit 7;;
  60         # Image preview for video, disabled by default.:
  61         ###video/*)
  62         ###    ffmpegthumbnailer -i "$path" -o "$cached" -s 0 && exit 6 || exit 1;;
  63     esac
  64 fi
  65
  66 case "$extension" in
  67     # Archive extensions:
  68     7z|a|ace|alz|arc|arj|bz|bz2|cab|cpio|deb|gz|jar|lha|lz|lzh|lzma|lzo|\
  69     rpm|rz|t7z|tar|tbz|tbz2|tgz|tlz|txz|tZ|tzo|war|xpi|xz|Z|zip)
  70         try als "$path" && { dump | trim; exit 0; }
  71         try acat "$path" && { dump | trim; exit 3; }
  72         try bsdtar -lf "$path" && { dump | trim; exit 0; }
  73         exit 1;;
  74     rar)
  75         try unrar -p- lt "$path" && { dump | trim; exit 0; } || exit 1;;
  76     # PDF documents:
  77     pdf)
  78         try pdftotext -l 10 -nopgbrk -q "$path" - && \
  79             { dump | trim | fmt -s -w $width; exit 0; } || exit 1;;
  80     # BitTorrent Files
  81     torrent)
  82         try transmission-show "$path" && { dump | trim; exit 5; } || exit 1;;
  83     # ODT Files
  84     odt|ods|odp|sxw)
  85         try odt2txt "$path" && { dump | trim; exit 5; } || exit 1;;
  86     # HTML Pages:
  87     htm|html|xhtml)
  88         try w3m    -dump "$path" && { dump | trim | fmt -s -w $width; exit 4; }
  89         try lynx   -dump "$path" && { dump | trim | fmt -s -w $width; exit 4; }
  90         try elinks -dump "$path" && { dump | trim | fmt -s -w $width; exit 4; }
  91         ;; # fall back to highlight/cat if the text browsers fail
  92 esac
  93
  94 case "$mimetype" in
  95     # Syntax highlight for text files:
  96     text/* | */xml)
  97         if [ "$(tput colors)" -ge 256 ]; then
  98             pygmentize_format=terminal256
  99             highlight_format=xterm256
 100         else
 101             pygmentize_format=terminal
 102             highlight_format=ansi
 103         fi
 104         try safepipe highlight --out-format=${highlight_format} "$path" && { dump | trim; exit 5; }
 105         try safepipe pygmentize -f ${pygmentize_format} "$path" && { dump | trim; exit 5; }
 106         exit 2;;
 107     # Ascii-previews of images:
 108     image/*)
 109         img2txt --gamma=0.6 --width="$width" "$path" && exit 4 || exit 1;;
 110     # Display information about media files:
 111     video/* | audio/*)
 112         exiftool "$path" && exit 5
 113         # Use sed to remove spaces so the output fits into the narrow window
 114         try mediainfo "$path" && { dump | trim | sed 's/  \+:/: /;';  exit 5; } || exit 1;;
 115 esac
 116
 117 exit 1