cvsignore -> gitignore converter

cvsignore2git.sh

#!/bin/sh

if [ ! -d .git ]; then
  echo ERROR: Please run this in the root of the git repository
  exit 1
fi

cat > .gitignore <<'EOF'
# CVS global ignores
RCS
SCCS
CVS
CVS.adm
RCSLOG
cvslog.*
tags
TAGS
.make.state
.nse_depinfo
*~
#*
.#*
,*
_$*
*$
*.old
*.bak
*.BAK
*.orig
*.rej
.del-*
*.a
*.olb
*.o
*.obj
*.so
*.exe
*.Z
*.elc
*.ln
core

EOF

split_cvsignore_line () {
    perl -pe 's!^\s+!!;s!\s+!\n!g;'
}

if [ -r $HOME/.cvsignore -o "$CVSIGNORE" ]; then
    echo '# User global ignores'
    [ -r $HOME/.cvsignore ] && cat $HOME/.cvsignore | split_cvsignore_line
    [ "$CVSIGNORE" ] && echo "$CVSIGNORE" | split_cvsignore_line
    echo
fi >> .gitignore

echo '# Project ignores (converted from .cvsignore files)' >> .gitignore
find -name .cvsignore | while read f ; do
    dir="$(dirname "$f" | sed -r 's:^\.::')"
    cat "$f" | split_cvsignore_line | awk '{print "'"$dir"'/"$1}' >> .gitignore
    git rm -f "$f"
done
git add .gitignore
git commit -m 'Automatically converted .cvsignore files to .gitignore using https://gist.github.com/xkr47/8bc17d69f5b8733250c0'

Improved version of http://stackoverflow.com/a/24016535/1356047

• adds the default ignores implied by CVS
• adds user ignores from ~/.cvsignore and $CVSIGNORE environment variable (if present)
• changes all filename processing to ensure special characters (like spaces) in .cvsignore paths get correctly processed
• split multiple entries on single .cvsignore line to multiple .gitignore lines
• automatically creates a commit that
  • removes the .cvsignore files
  • adds the .gitignore file