examples/scripts.v2/pf

   1 #! /bin/bash
   2 #
   3 # original from:
   4 #
   5 # @(#) p.ksh 1.1 93/11/09
   6 # p: page compressed & plain files in the order given
   7 # 92/01/23 john h. dubois iii (john@armory.com)
   8 # 92/02/14 changed incorrect zpack to pcat
   9 # 92/02/16 added help
  10 # 92/10/11 search for file.Z and file.z if file not found
  11 # 92/10/18 pass options to pager
  12 # 93/11/09 Understand gzipped files too
  13 #          Wait after printing message about unreadable files
  14 #          Make less prompt include name of file being uncompressed
  15 #
  16 # conversion to bash v2 by Chet Ramey; renamed to pf
  17 #
  18 DefPager=/local/bin/less
  19
  20 istrue()
  21 {
  22         test 0 -ne "$1"
  23 }
  24
  25 warn()
  26 {
  27         echo "$@" 1>&2
  28 }
  29
  30 if [ "$1" = -h ]; then
  31     echo \
  32 "$0: page a file.
  33 Usage: $0 [pager-option ...] [filename ...]
  34 Files are paged by the program specified in the user's PAGER
  35 environment variable, or by $DefPager if PAGER is not set.
  36 If no filename is given, text to page is read from the standard input.
  37 If filenames are given, they are either paged directly, or unpacked/
  38 uncompressed and then paged.  Files are assumed to be in packed, compressed,
  39 or gzipped format if the filename ends in .Z, .z, or .gz respectively.
  40 If a filename that does not end in .Z, .z, or .gz is not found, it is
  41 searched for with one of those extensions attached.
  42 Each group of plain files is paged by a single instance of the pager.
  43 Each packed or compressed file is paged by a separate instance of the
  44 pager.
  45 Initial arguments beginning with + or - are taken to be pager options and
  46 are passed to each instance of the pager.
  47 If a pager option takes a value it should be given with the option as a
  48 single argument (with no space between the option and the value)."
  49     exit 0
  50 fi
  51
  52 # Get pager options
  53 while [ $# -gt 0 ]; do
  54     case "$1" in
  55     -*|+*)      Opts="$Opts $1" ; shift;;
  56     *)  break;;
  57     esac
  58 done
  59
  60 [ -z "$PAGER" ] && PAGER=$DefPager
  61
  62 # Read from stdin
  63 [ $# = 0 ] && exec $PAGER $Opts
  64
  65 typeset -i filenum=0 badfile=0
  66
  67 for file; do
  68     if [ ! -r "$file" ]; then
  69         case "$file" in
  70         *.[Zz]|*.gz)
  71                 # Check if user specified a compressed file without giving its extension
  72                 for ext in Z z gz; do
  73                     if [ -r "$file.$ext" ]; then
  74                         file="$file.$ext"
  75                         break
  76                     fi
  77                 done;;
  78         esac
  79     fi
  80     if [ ! -r "$file" ]; then
  81         warn "$file: cannot read."
  82         badfile=1
  83     else
  84         files[filenum]=$file
  85         let filenum+=1
  86     fi
  87 done
  88
  89 if istrue $badfile && [ $filenum -gt 0 ]; then
  90     echo -n "Press return to continue..." 1>&2
  91     read
  92 fi
  93
  94 unset plain
  95
  96 for file in "${files[@]}"; do
  97     case "$file" in
  98     *.[zZ]|*.gz)
  99         set -- Z zcat z pcat gz gzcat
 100         # Find correct uncompression program
 101         while [ $# -gt 0 ]; do
 102             case "$file" in
 103             *.$1)
 104                 # Page any uncompressed files so that they will be read
 105                 # in the correct order
 106                 [ ${#plain[@]} -gt 0 ] && $PAGER $Opts "${plain[@]}"
 107                 unset plain[*]
 108                 # If page is less, set the prompt to include the name of
 109                 # the file being uncompressed.  Escape the . in the extension
 110                 # because less treats is specially in prompts (other dots
 111                 # in filenames will still be mucked with).
 112                 case "$PAGER" in
 113                 *less)  Prompt="-P[${file%.$1}\\.$1] (%pb\\%)" ;;
 114                 *)      unset Prompt ;;
 115                 esac
 116                 $2 "$file" | $PAGER "$Prompt" $Opts
 117                 break
 118             esac
 119             shift 2
 120         done
 121         ;;
 122     *)  plain[${#plain[@]}]=$file;;
 123     esac
 124 done
 125
 126 # Page any uncompressed files that haven't been paged yet
 127 [ ${#plain[@]} -gt 0 ] && exec $PAGER $Opts "${plain[@]}"