git: add remote info support

With this new option, we get information about which remote branch we're
tracking. On top of this, we'll get information about ahead/behind
commits when we diverged from remote. The output format will be in the
form:

'local...remote +ahead -behind',

where ahead and behind are the number of commits ahead and behind.

This functionality is controlled by a new option called
'@dracula-git-show-remote-status'.

Note that for this to be properly displayed, we need to increase the
size of the right status bar when the git plugin is enabled.

In order to be easier to introduce the change, getMessage() was also a
bit changed in order to be easier to append the remote info.

Signed-off-by: Nuno Sá <noname.nuno@gmail.com>

INSTALL.md

@@ -212,6 +212,12 @@ Hide untracked files from being displayed as local changes
 set -g @dracula-git-no-untracked-files true
 ```
 
+Show remote tracking branch together with diverge/sync state
+```bash
+# default is false
+set -g @dracula-git-show-remote-status true
+```
+
 #### weather options
 
 Switch from default fahrenheit to celsius

scripts/dracula.sh

@@ -129,7 +129,8 @@ main()
 
     if [ $plugin = "git" ]; then
       IFS=' ' read -r -a colors  <<< $(get_tmux_option "@dracula-git-colors" "green dark_gray")
-        script="#($current_dir/git.sh)"     
+      tmux set-option -g status-right-length 250
+      script="#($current_dir/git.sh)"
     fi
 
     if [ $plugin = "battery" ]; then

scripts/git.sh

@@ -8,6 +8,7 @@ IFS=' ' read -r -a current_symbol <<< $(get_tmux_option "@dracula-git-show-curre
 IFS=' ' read -r -a diff_symbol <<< $(get_tmux_option "@dracula-git-show-diff-symbol" "!")
 IFS=' ' read -r -a no_repo_message <<< $(get_tmux_option "@dracula-git-no-repo-message" "")
 IFS=' ' read -r -a no_untracked_files <<< $(get_tmux_option "@dracula-git-no-untracked-files" "false")
+IFS=' ' read -r -a show_remote_status <<< $(get_tmux_option "@dracula-git-show-remote-status" "false")
 
 # Get added, modified, updated and deleted files from git status
 getChanges()
@@ -110,11 +111,30 @@ getBranch()
     fi
 }
 
+getRemoteInfo()
+{
+    base=$(git -C $path for-each-ref --format='%(upstream:short) %(upstream:track)' "$(git -C $path symbolic-ref -q HEAD)")
+    remote=$(echo "$base" | cut -d" " -f1)
+    out=""
+
+    if [ -n "$remote" ]; then
+        out="...$remote"
+        ahead=$(echo "$base" | grep -E -o 'ahead[ [:digit:]]+' | cut -d" " -f2)
+        behind=$(echo "$base" | grep -E -o 'behind[ [:digit:]]+' | cut -d" " -f2)
+
+        [ -n "$ahead" ] && out+=" +$ahead"
+        [ -n "$behind" ] && out+=" -$behind"
+    fi
+
+    echo "$out"
+}
+
 # return the final message for the status bar
 getMessage()
 {
     if [ $(checkForGitDir) == "true" ]; then
         branch="$(getBranch)"
+        output=""
 
         if [ $(checkForChanges) == "true" ]; then 
             
@@ -122,25 +142,28 @@ getMessage()
             
             if [ "${hide_status}" == "false" ]; then
                 if [ $(checkEmptySymbol $diff_symbol) == "true" ]; then
-                    echo "${changes} $branch"                    
+		     output=$(echo "${changes} $branch")
                 else
-                    echo "$diff_symbol ${changes} $branch"
+		     output=$(echo "$diff_symbol ${changes} $branch")
                 fi
             else
                 if [ $(checkEmptySymbol $diff_symbol) == "true" ]; then
-                    echo "$branch"
+		     output=$(echo "$branch")
                 else
-                    echo "$diff_symbol $branch"                    
+		     output=$(echo "$diff_symbol $branch")
                 fi
             fi
 
         else
             if [ $(checkEmptySymbol $current_symbol) == "true" ]; then
-                echo "$branch"
+	         output=$(echo "$branch")
             else
-                echo "$current_symbol $branch"
+		 output=$(echo "$current_symbol $branch")
             fi
         fi
+
+        [ "$show_remote_status" == "true" ] && output+=$(getRemoteInfo)
+        echo "$output"
     else
         echo $no_repo_message
     fi