create venv fish function

.config/fish/functions/venv.fish

@@ -1,24 +1,86 @@
-# taken from https://jinyuz.dev/2020/07/switching-from-pyenv-rbenv-goenv-and-nvm-to-asdf/
-function venv --argument-names 'python_version' --description 'Create virtualenv named the same as current directory'
-  set -l python_bin
+# https://treyhunner.com/2024/10/switching-from-virtualenvwrapper-to-direnv-starship-and-uv/
+function venv
+    set -l force false
+    set -l venv_name
+    set -l dir_name (basename $PWD)
+    set -l uv_args
+    set -l python_version
 
-  if not test -n "$python_version"
-    # Use default python version set by asdf
-    set python_bin ($HOME/.asdf/bin/asdf which python)
-  else
-    set python_bin $ASDF_DIR/installs/python/$python_version/bin/python
-  end
+    # Parse options
+    set -l options
+    for arg in $argv
+        switch $arg
+            case -f --force
+                set force true
+            case --python
+                set -a options $arg
+                set python_version true
+            case '*'
+                if test "$python_version" = true
+                    set -a options $arg
+                    set python_version false
+                else
+                    set -a options $arg
+                end
+        end
+    end
 
-  set -l venv_name (basename $PWD | tr . -)
+    # Determine venv name
+    if test (count $options) -eq 0
+        set venv_name $dir_name
+    else if test -n "$python_version"
+        set venv_name $dir_name
+    else
+        set venv_name $options[-1]
+        set -e options[-1]
+    end
 
-  echo
-  if not test -e $python_bin
-    echo "Python version `$python_version` is not installed."
-    return 1
-  end
+    # Check if .envrc already exists
+    if test -f .envrc; and test $force = false
+        echo "Error: .envrc already exists. Use --force or -f to recreate." >&2
+        return 1
+    end
 
-  echo Creating virtualenv `$venv_name`
-  $python_bin -m venv $HOME/.virtualenvs/$venv_name
-  source $HOME/.virtualenvs/$venv_name/bin/activate.fish
+    # Remove existing .envrc and venv if force is true
+    if test $force = true
+        test -f .envrc && rm .envrc
+        test -d $venv_name && rm -rf $venv_name
+    end
+
+    # Prepare uv arguments
+    set -a uv_args --seed
+    set -a uv_args --prompt $venv_name
+    set -a uv_args $options
+    set -a uv_args $venv_name
+
+    # Create venv using uv with all passed arguments
+    if not uv venv $uv_args
+        echo "Error: Failed to create venv" >&2
+        return 1
+    end
+
+    # Check for uv.lock and run uv sync if it exists
+    if test -f uv.lock
+        echo "Found uv.lock, running uv sync..."
+        if not uv sync
+            echo "Warning: uv sync failed" >&2
+        end
+    end
+
+    # Create .envrc
+    echo "layout python" >.envrc
+
+    # Update ~/.projects without duplication
+    set -l projects_file ~/.projects
+    set -l project_entry "$dir_name = $PWD"
+    if test -f $projects_file
+        # Remove any existing entries for this project
+        set -l temp_file (mktemp)
+        grep -v "^$dir_name =" $projects_file >$temp_file
+        mv $temp_file $projects_file
+    end
+    echo $project_entry >>$projects_file
+
+    # Allow direnv to immediately activate the virtual environment
+    direnv allow
 end
-