Make direnv use .venv/, show Python version in PS1.

.bashrc

@@ -74,20 +74,48 @@ do
     fi
 done
 
+trim() {
+    local var="$*"
+    # remove leading whitespace characters
+    var="${var#"${var%%[![:space:]]*}"}"
+    # remove trailing whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"
+    printf '%s' "$var"
+}
+
+shortest()
+{
+    # Returns the shortest of two strings
+    if [[ ${#1} -lt ${#2} ]]
+    then
+        printf "%s" "$1"
+    else
+        printf "%s" "$2"
+    fi
+
+}
 
 python_ps1()
 {
-    local pypath="$(which python 2>/dev/null)"
-    if [[ -z "$pypath" ]] || [[ "$pypath" == "/usr/bin/python" ]]
-    then
+    local relative venvpath pyversion _
+
+    venvpath="$(which python 2>/dev/null)"
+    venvpath="${venvpath%/bin/python}"
+
+    if [[ -z "$venvpath" ]] || [[ "$venvpath" == "/usr" ]]; then
         return
     fi
-    local relative="$(realpath --relative-to=$(pwd) -s "$pypath")"
-    if [[ ${#relative} -lt ${#pypath} ]]
-    then
-        pypath="$relative"
+
+    relative="$(realpath --relative-to="$(pwd)" -s "$venvpath")"
+    venvpath="$(shortest "$venvpath" "$relative")"
+
+    if [[ "$venvpath" == ".venv" ]]; then
+        venvpath=""  # No need to tell me my venv is in .venv, I can guess it.
     fi
-    printf "$1" "${pypath%/bin/python}"
+
+    read -r _ pyversion <<<"$(python --version)"
+
+    printf "$1" "$(trim "$venvpath $pyversion")"
 }
 
 if [[ "$TERM" != 'dumb' ]]
@@ -203,21 +231,14 @@ e()
 
 venv()
 {
-    # direnv-first venv creation.
-    if [[ -f .envrc ]]
-    then
-        echo '`.envrc` file already exists!'
-        return
-    fi
-    echo "layout python3" > .envrc
+    # Simple helper to use direnv to create Python venvs.
+    #
+    # See https://github.com/pappasam/jedi-language-server/issues/199#issuecomment-1836880575
+    # for more context.
+    printf "VIRTUAL_ENV=.venv\nlayout python3\n" > .envrc
     direnv allow .
 }
 
-pip-common()
-{
-    python -m pip install --upgrade --upgrade-strategy eager mypy black flake8 jedi-language-server pylint build twine grip tox pip
-}
-
 github-gpg()
 {
     curl https://github.com/$1.gpg | gpg --import-options show-only --import -