python dev: add uv and ruff

with helix language configuration snipped from
https://github.com/helix-editor/helix/discussions/6816#discussioncomment-10550791

.config/helix/languages.toml

@@ -25,15 +25,6 @@ inlayHints.discriminantHints.enable = "fieldless"
 inlayHints.lifetimeElisionHints.enable = "skip_trivial"
 inlayHints.typeHints.hideClosureInitialization = false
 
-[language-server.jinja-lsp]
-command = "jinja-lsp"
-config = { templates = "./templates", backend = ["./src"], lang = "rust"}
-timeout = 5
-
-[[language]]
-name = "jinja"
-language-servers = ["jinja-lsp"]
-
 [[language]]
 name = "ai-chat"
 language-servers = ["lsp-ai"]
@@ -90,6 +81,51 @@ model = "model2"
 max_tokens = 64
 max_context = 1024
 
+[language-server.jinja-lsp]
+command = "jinja-lsp"
+config = { templates = "./templates", backend = ["./src"], lang = "rust"}
+timeout = 5
+
+
+[[language]]
+name = "jinja"
+language-servers = ["jinja-lsp"]
+
+[[language]]
+name = "python"
+language-id = "python"
+roots = ["pyproject.toml", "setup.py", "poetry.lock", ".git", ".jj", ".venv/"]
+language-servers = ["ruff", "pyright"]
+auto-format = true
+# formatter = { command = "black", args = ["--quiet", "-", "--line-length=80"] }
+formatter = { command = "ruff", args = ["format", "-" ] }
+file-types = ["py", "ipynb"]
+comment-token = "#"
+shebangs = ["python"]
+
+[language-server.pyright]
+command = "pyright-langserver"
+args = ["--stdio"]
+
+[language-server.ruff]
+command = "ruff"
+args = ["server"]
+environment = { "RUFF_TRACE" = "messages" }
+
+[language-server.ruff.config.settings]
+lineLength = 80
+logLevel = "debug"
+
+[language-server.ruff.config.settings.lint]
+# select = ["E", "F", "W", "B", "I", "RUF", "N", "LOG", "ERA", "W", "D", "UP", "ANN", "ASYNC", "S", "RET", "TCH", "ARG", "PTH", "DOC"]
+preview = true
+
+[language-server.ruff.config.settings.format]
+preview = true
+# quote-style = "double"
+docstring-code-format = true
+# indent-style = "space"
+
 [[language]]
 name = "rust"
 language-servers = ["rust-analyzer", "lsp-ai"]

.profile

@@ -22,3 +22,5 @@ if [ -d "$HOME/bin" ] ; then
 fi
 
 . "$HOME/.cargo/env"
+
+. "$HOME/.local/share/../bin/env"

README.org

@@ -211,8 +211,11 @@ Install [[https://difftastic.wilfred.me.uk/][difftastic]] ([[https://github.com/
 *** setup development stuff
 
 https://realpython.com/dependency-management-python-poetry/
+and then try =uv=:
   #+begin_src bash
     sudo dnf install python3-lsp-server+all
+    curl -LsSf https://astral.sh/uv/install.sh | sh
+    uv tool install ruff@latest
   #+end_src
 
 ** NEXT Moving to Guix