Make OG fud installable as a script again (#2534)

Looks like dadff7e removed the `fud`
command-line tool. This brings it back—with the goal of being able to
`uv tool install ./fud`. I think it is exciting that no one noticed for
a little while; that means that no one tried to set up OG fud from
scratch in that time!

I am still getting some errors, when I do this install with `uv`, about
a missing dependency on the `calyx-py` library. But we're getting
closer?

Author: sampsyo

docs/intro.md

@@ -183,7 +183,6 @@ Congratulations! You've simulated your first hardware design with Calyx.
 [icarus verilog]: http://iverilog.icarus.com
 [jq]: https://stedolan.github.io/jq/
 [jq-install]: https://stedolan.github.io/jq/
-[flit]: https://flit.readthedocs.io/en/latest/
 [interpreter]: ./running-calyx/interpreter.md
 [homebrew]: https://brew.sh
 [fud-icarus]: ./running-calyx/fud/index.md#icarus-verilog

docs/running-calyx/fud/index.md

@@ -17,32 +17,29 @@ The source for fud is [here](https://github.com/calyxir/calyx/tree/master/fud).
 
 `fud` currently has a dependency on [calyx-py](builder/calyx-py.md), which you need to install first.
 
-You need [Flit](https://flit.readthedocs.io/en/latest/) to install `fud`. Install it with `pip3 install flit`.
-
-You can then install `fud` with
+You need [uv][] to install `fud`.
+Follow its [installation instructions][uv install].
+Then:
 
 ```bash
-cd fud && flit install
+uv tool install ./fud
 ```
-(If using this method to install `fud`, `pip3` should be version >= 20)
 
 If you are working on `fud` itself, you can install it with a symlink with:
-```bash
-cd fud && flit install --symlink
-```
-
-You can also install `fud` with
 
 ```bash
-flit build
-pip3 install dist/fud-0.3.0-py3-none-any.whl
+uv tool install -e ./fud
 ```
 
 Finally, point `fud` to the root of the repository:
+
 ```
 fud config global.root <full path to Calyx repository>
 ```
 
+[uv]: https://docs.astral.sh/uv/
+[uv install]: https://docs.astral.sh/uv/#installation
+
 ## Configuration
 
 Fud uses a global configuration file to locate tool paths and default values.

docs/running-calyx/fud/xilinx.md

@@ -17,14 +17,6 @@ You can set `fud` up to use either a local installation of the Xilinx tools or o
 The simplest way to use the Xilinx tools is to synthesize RTL or HLS designs to collect statistics about them.
 This route will not produce actual, runnable executables; see the next section for that.
 
-### Installing Dependencies
-
-`fud` uses extra dependencies to invoke the Xilinx toolchains.
-Run the following command to install all required dependencies:
-```
-cd fud && flit install -s --deps all
-```
-
 ### Setting up Remote Tools
 
 > Follow these instructions if you're attempting to run `vivado` or `vivado-hls` on a server from your local machine. If you are working directly on a server with these tools, skip to the [run instructions](#run).

fud/pyproject.toml

@@ -21,8 +21,12 @@ dependencies = [
     "numpy",
     "simplejson",
     "networkx>=2.6",
+    "calyx-ast",
 ]
 
 [project.optional-dependencies]
 remote = ["paramiko", "scp"]
 fpga = ["pynq"]
+
+[project.scripts]
+fud = "fud.main:main"