Add minimal HG prompt to powerline themes

themes/powerline/powerline.base.bash

@@ -86,6 +86,8 @@ function __powerline_scm_prompt {
       scm_prompt+="${SCM_CHAR}${SCM_BRANCH}${SCM_STATE}"
     elif [[ "${SCM_P4_CHAR}" == "${SCM_CHAR}" ]]; then
       scm_prompt+="${SCM_CHAR}${SCM_BRANCH}${SCM_STATE}"
+    elif [[ "${SCM_HG_CHAR}" == "${SCM_CHAR}" ]]; then
+      scm_prompt+="${SCM_CHAR}${SCM_BRANCH}${SCM_STATE}"
     fi
     echo "${scm_prompt}${scm}|${color}"
   fi

themes/powerline/powerline.theme.bash

@@ -15,6 +15,7 @@ PYTHON_VENV_THEME_PROMPT_COLOR=35
 
 SCM_NONE_CHAR=""
 SCM_GIT_CHAR=${POWERLINE_SCM_GIT_CHAR:=" "}
+SCM_HG_CHAR=${POWERLINE_SCM_HG_CHAR:="☿ "}
 SCM_THEME_PROMPT_CLEAN=""
 SCM_THEME_PROMPT_DIRTY=""
 SCM_THEME_PROMPT_CLEAN_COLOR=25