sync_gist(): skip sync dirty repos, warn instead.

README.md

@@ -81,6 +81,8 @@ After that, you may run `gister sync` to fetch all your gists to local.
 
 Warn: `sync` can only fetch up to 10 million gists for you. If you have more than 10 million gists, you need to modify the source of `gister` yourself.
 
+Also note that `gister sync` will not sync dirty repos.
+It will gives a warning on the stdout.
 
 ### publish
 

gister.sh

@@ -243,7 +243,11 @@ sync_gist() {
  if test $time_difference_abs -le 6; then
  echo "[x] $gist_id"
  else
- git pull && git push
+ if [ $(git status --porcelain | wc -l) -eq 0 ]; then # clean
+ git pull && git push
+ else # dirty
+ echo "DIRTY $gist_id"
+ fi
  fi
  else
  cd $gisthome/tree