Theme barbuk - add venv glyph and fix venv display in ssh mode (Bash-it#1681)

* Add python venv glyph

* Fix venv display (tested for local and ssh prompt)

* Add documentation for python venv

Author: BarbUk

themes/barbuk/README.md

@@ -29,6 +29,7 @@ BARBUK_GIT_BRANCH_ICON=''
 BARBUK_HG_CHAR='☿ '
 BARBUK_SVN_CHAR='⑆ '
 BARBUK_EXIT_CODE_ICON=' '
+BARBUK_PYTHON_VENV_CHAR=' '
 ```
 
 ### Customize glyphs
@@ -97,3 +98,9 @@ chmod 400 /etc/sudoers.d/keepenv
 ```bash
 user@hostname in  ~/bash-it on  master ✓ ❯
 ```
+
+### Python venv
+
+```bash
+  flask ~/test on  master ✓ ❯
+```

themes/barbuk/barbuk.theme.bash

@@ -10,6 +10,7 @@ SCM_GIT_CHAR_ICON_BRANCH=${BARBUK_GIT_BRANCH_ICON:=''}
 SCM_HG_CHAR=${BARBUK_HG_CHAR:='☿ '}
 SCM_SVN_CHAR=${BARBUK_SVN_CHAR:='⑆ '}
 EXIT_CODE_ICON=${BARBUK_EXIT_CODE_ICON:=' '}
+PYTHON_VENV_CHAR=${BARBUK_PYTHON_VENV_CHAR:=' '}
 
 # Ssh user and hostname display
 SSH_INFO=${BARBUK_SSH_INFO:=true}
@@ -90,12 +91,12 @@ function _prompt {
 
     # Detect python venv
     if [[ -n "${CONDA_DEFAULT_ENV}" ]]; then
-        python_venv="${CONDA_DEFAULT_ENV}"
+        python_venv="$PYTHON_VENV_CHAR${CONDA_DEFAULT_ENV} "
     elif [[ -n "${VIRTUAL_ENV}" ]]; then
-        python_venv=$(basename "${VIRTUAL_ENV}")
+        python_venv="$PYTHON_VENV_CHAR$(basename "${VIRTUAL_ENV}") "
     fi
 
-    PS1="\\n${ssh_info} ${python_venv} ${purple}$(scm_char)${dir_color}\\w${normal}$(scm_prompt_info)${exit_code}"
+    PS1="\\n${ssh_info} ${purple}$(scm_char)${python_venv}${dir_color}\\w${normal}$(scm_prompt_info)${exit_code}"
 
     [[ ${#PS1} -gt $((COLUMNS*3)) ]] && wrap_char="\\n"
     PS1="${PS1}${wrap_char}❯${normal} "