adding git details to bash prompt. fixes #2

bash/.bashrc

@@ -66,9 +66,41 @@ sh_yellow="\[\033[1;33m\]"
 sh_light_gray="\[\033[0;37m\]"
 sh_white="\[\033[1;37m\]"
 
+function git_prompt {
+	PCHANGED=""
+	PAHEAD=""
+	PBEHIND=""
+    local FULL_BRANCH="$(git symbolic-ref -q HEAD 2>/dev/null || git name-rev --name-only --no-undefined --always HEAD 2>/dev/null)"
+    PBRANCH="$(echo $FULL_BRANCH | sed 's/refs\/heads\///')"
+    if [ -n $PBRANCH ]; then
+        echo -n "${PBRANCH} "
+        # Are there unstaged changes in the working directory
+        local CHANGED=$(git status --porcelain --ignore-submodule -unormal 2>/dev/null | wc -l)
+        if [ $CHANGED -gt 0 ]; then
+            PCHANGED="◊"
+        fi
+        # Are we behind the origin?
+        local NUM_BEHIND="$(git log --oneline ..@{u} 2>/dev/null | wc -l | tr -d ' ' )"
+        if [ "$NUM_BEHIND" -gt 0 ]; then
+            PBEHIND="↓"
+        fi
+        # Are we ahead of the origin?
+        local NUM_AHEAD="$(git log --oneline @{u}.. 2>/dev/null | wc -l | tr -d ' ')"
+        if [ "$NUM_AHEAD" -gt 0 ]; then
+            PAHEAD="↑"
+        fi
+
+        if [[ -n $PCHANGED || -n $PAHEAD || -n $PBEHIND ]]; then
+            echo -n "${PCHANGED}${PBEHIND}${PAHEAD}"
+        fi
+    fi
+}
+
+
+
 # Make a pretty prompt.
 export PROMPT_COMMAND='history -a; if [ $? -ne 0 ];then ERROR_FLAG=1;else ERROR_FLAG=;fi;'
-export PS1=${HOSTCOLOUR}${sh_light_gray}'\t | \h'${sh_green}':\w'${sh_light_gray}' '${sh_light_gray}'${ERROR_FLAG:+'${sh_light_red}'}\$ '${sh_norm}
+export PS1=${HOSTCOLOUR}${sh_light_gray}'\t | \h'${sh_green}':\w'${sh_light_gray}' $(git_prompt)'${sh_light_gray}'${ERROR_FLAG:+'${sh_light_red}'}\$ '${sh_norm}
 
 # New files and folders should not be world readable
 umask 0027