✨ feat(fish): auto activate python env

.config/fish/conf.d/venv.fish

@@ -0,0 +1,30 @@
+# Based on https://gist.github.com/bastibe/c0950e463ffdfdfada7adf149ae77c6f
+# Changes:
+# * Instead of overriding cd, we detect directory change. This allows the script to work
+#   for other means of cd, such as z.
+# * Update syntax to work with new versions of fish.
+# * Handle virtualenvs that are not located in the root of a git directory.
+
+function __auto_source_venv --on-variable PWD --description "Activate/Deactivate virtualenv on directory change"
+    status --is-command-substitution; and return
+
+    # Check if we are inside a git directory
+    if git rev-parse --show-toplevel &>/dev/null
+        set gitdir (realpath (git rev-parse --show-toplevel))
+        set cwd (pwd -P)
+        # While we are still inside the git directory, find the closest
+        # virtualenv starting from the current directory.
+        while string match "$gitdir*" "$cwd" &>/dev/null
+            if test -e "$cwd/.venv/bin/activate.fish"
+                source "$cwd/.venv/bin/activate.fish" &>/dev/null
+                return
+            else
+                set cwd (path dirname "$cwd")
+            end
+        end
+    end
+    # If virtualenv activated but we are not in a git directory, deactivate.
+    if test -n "$VIRTUAL_ENV"
+        deactivate
+    end
+end