#!/bin/sh

#

# Check the format of the source files in the current directory - checks for a

# line length of 80 characters max and no tab characters.

#

# Optionally arguments are files or directories to check.

#

# -v: output the long lines (makes fixing them easier)

# -e: spawn an editor for each file that needs a change ($EDITOR must be

#     defined).  When using -e the script MUST be run from an interactive

#     command line.

verbose=

edit=

vers=

test "$1" = "-v" && {

   shift

   verbose=yes

}

test "$1" = "-e" && {

   shift

   if test -n "$EDITOR"

   then

      edit=yes

      # Copy the standard streams for the editor

      exec 3>&0 4>&1 5>&2

   else

      echo "chkfmt -e: EDITOR must be defined" >&2

      exit 1

   fi

}

# Function to edit a single file - if the file isn't changed ask the user

# whether or not to continue.  This stuff only works if the script is run from

# the command line (otherwise, don't specify -e or you will be sorry).

doed(){

   cp "$file" "$file".orig

   "$EDITOR" "$file" 0>&3 1>&4 2>&5 3>&- 4>&- 5>&- || exit 1

   if cmp -s "$file".orig "$file"

   then

      rm "$file".orig

      echo -n "$file: file not changed, type anything to continue: " >&5

      read ans 0>&3

      test -n "$ans" || return 1

   fi

   return 0

}

# In beta versions the version string which appears in files can be a little

# long and cause spuriously overlong lines.  To avoid this subtitute the version

# string with a 'standard' version a.b.cc before checking for long lines.

if test -r png.h

then

   vers="`sed -n -e \

   's/^#define PNG_LIBPNG_VER_STRING .\([0-9]\.[0-9]\.[0-9][0-9a-z]*\).$/\1/p' \

   png.h`"

   echo "chkfmt: checking version $vers"

fi

if test -z "$vers"

then

   echo "chkfmt: png.h not found, ignoring version number" >&2

fi

test -n "$1" || set -- .

find "$@" \( -type d \( -name '.git' -o -name '.libs' -o -name 'projects' \) \

   -prune \) -o \( -type f \

   ! -name '*.[oa]' ! -name '*.l[oa]' !  -name '*.png' ! -name '*.out' \

   ! -name '*.jpg' ! -name '*.patch' ! -name '*.obj' ! -name '*.exe' \

   ! -name '*.com' ! -name '*.tar.*' ! -name '*.zip' ! -name '*.ico' \

   ! -name '*.res' ! -name '*.rc' ! -name '*.mms' ! -name '*.rej' \

   ! -name '*.dsp' ! -name '*.orig' ! -name '*.dfn' ! -name '*.swp' \

   ! -name '~*' ! -name '*.3' \

   ! -name 'missing' ! -name 'mkinstalldirs' ! -name 'depcomp' \

   ! -name 'aclocal.m4' ! -name 'install-sh' ! -name 'Makefile.in' \

   ! -name 'ltmain.sh' ! -name 'config*' -print \) | {

   st=0

   while read file

   do

      case "$file" in

      *.mak|*[Mm]akefile.*|*[Mm]akefile)

         # Makefiles require tabs, dependency lines can be this long.

         check_tabs=

         line_length=100;;

      *.awk)

         # Includes literal tabs

         check_tabs=

         # The following is arbitrary

         line_length=132;;

      *contrib/*/*.[ch])

         check_tabs=yes

         line_length=96;;

      *)

         check_tabs=yes

         line_length=80;;

      esac

      # Note that vers can only contain 0-9, . and a-z

      if test -n "$vers"

      then

         sed -e "s/$vers/a.b.cc/g" "$file" >"$file".$$

      else

         cp "$file" "$file".$$

      fi

      splt="`fold -$line_length "$file".$$ | diff -c "$file".$$ -`"

      rm "$file".$$

      if test -n "$splt"

      then

         echo "$file: lines too long"

         st=1

         if test -n "$EDITOR" -a -n "$edit"

         then

            doed "$file" || exit 1

         elif test -n "$verbose"

         then

            echo "$splt"

         fi

      fi

      if test -n "$check_tabs"

      then

         tab="`tr -c -d '\t' <"$file"`"

         if test -n "$tab"

         then

            echo "$file: file contains tab characters"

            st=1

            if test -n "$EDITOR" -a -n "$edit"

            then

               doed "$file" || exit 1

            elif test -n "$verbose"

            then

               echo "$splt"

            fi

         fi

      fi

   done

   exit $st

}