lustre/kernel_patches/scripts/extract_description

   1 #!/bin/sh
   2
   3 insert_line()
   4 {
   5         PATTERN="$1"
   6         LINE="$2"
   7         FILE="$3"
   8         awk ' BEGIN { found=0; }
   9                 /'"$PATTERN"'/ {
  10                         print;
  11                         if (!found)
  12                                 printf("%s\n", "'$LINE'");
  13                         found=1;
  14                         next;
  15                 }
  16                 { print; }
  17         ' < "$FILE"
  18 }
  19
  20 # extract the description from the top of a patch
  21 # filter stdin
  22 # collapse adjacent blank lines to a single blank line
  23 # remove any lines that look like diffstat output
  24 # stop output on encountering a line beginning with '---' (beginning of patch)
  25
  26         TMPFILE=`mktemp /tmp/xdtmp.XXXXXX` || exit 1
  27         formail -kfcb -X 'From:' -X 'Subject:' |\
  28         awk '
  29                 BEGIN { found_end=0; lastone="x"; }
  30                 /^ .* [|] +[0-9]+ [+-]+$/ {
  31                         #/* we found something like diffstat output... */
  32                         if (found_end == 1) {
  33                                 /* we are past end of diffstat, let it pass */
  34                                 print;
  35                         }
  36                         next;
  37                 }
  38                 /^ [1-9][0-9]* files changed/ {
  39                         #/* end of diffstat output, stop filtering diffstat */
  40                         found_end=1;
  41                         next;
  42                 }
  43                 /^--- / { exit; }
  44                 {
  45                         #/* collapse adjacent blank lines to 1 blank line */
  46                         if ( $0 == "" && lastone == "" )
  47                                 next;
  48                         else
  49                                 print;
  50                         lastone=$0;
  51                 }
  52         ' | awk '{ if ($0 == "" && FNR == 1)  next; print; }' > "$TMPFILE"
  53
  54         descs=`head -10 $TMPFILE | grep -c '^[  ]*DESC[         ]*$'`
  55         if [ "$descs" = "0" ]
  56         then
  57                 # DESC is not 1st non blank line in the file
  58                 echo "DESC"
  59                 descs=0
  60         fi
  61         edescs=`grep -c '^EDESC$' "$TMPFILE"`
  62         subjects=`grep -c '^[   ]*Subject[:]' "$TMPFILE"`
  63         froms=`grep -c '^[      ]*From[:]' "$TMPFILE"`
  64         if [ "$edescs" = "0" ]
  65         then
  66                 if [ "$subjects" != "0" ]
  67                 then
  68                         insert_line '^Subject[:]' 'EDESC' "$TMPFILE"
  69                 else
  70                         if [ "$froms" != "0" ]
  71                         then
  72                                 insert_line '^From[:]' 'EDESC' "$TMPFILE"
  73                         else
  74                                 if [ "$descs" = "0" ]
  75                                 then
  76                                         # blank DESC line...
  77                                         echo '(undescribed patch)'
  78                                         echo EDESC
  79                                         cat "$TMPFILE"
  80                                 else
  81                                         insert_line '^DESC$' "EDESC" "$TMPFILE"
  82                                 fi
  83                         fi
  84                 fi
  85         else
  86                 cat $TMPFILE
  87         fi