Add convenient project base

.gitignore

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+/target
+output/
+.env

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc2022"
+version = "0.0.0"
+dependencies = [
+ "itertools",
+]
+
+[[package]]
+name = "either"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90e5c1c8368803113bf0c9584fc495a58b86dc8a29edbf8fe877d21d9507e797"
+
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]

Cargo.toml

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+[package]
+name = "aoc2022"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+itertools = "0.10.5"

README.md

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+# Advent Of Code 2022
+
+My solutions for [Advent Of Code](https://adventofcode.com) 2022.
+
+## Usage
+
+This project uses [`just`](https://github.com/casey/just) to speed up some commands. For some commands to work (like downloading puzzle input or submitting a solution) a session token needs to be provided in the `AOC_SESSION` environment variable. The easiest way to set it is to create the file `.env` with `AOC_SESSION=your token` inside in the root of this repository. The token can be received by reading the session cookie from the AOC website.
+
+Download the puzzle input, create a file for the current day and open it in vscode:
+
+```shell
+just begin        # Prepare the current day
+just day=09 begin # Prepare day 9
+```
+
+Run:
+
+```shell
+just        # Runs the current day
+just day=09 # Runs day 9
+```
+
+After running a puzzle the output is saved to `output/XX.log`. This log will be read when submitting puzzles:
+
+```shell
+just submit 1        # Submit the first half of a puzzle
+just submit 2        # Submit the second half of a puzzle
+just day=09 submit 2 # Submit the second half of the puzzle for day 9
+```
+
+Submit looks for a line containing `level-1-solution=123` to submit 123 as the solution to level 1. There is a convenience function `solved_level_1` in `lib.rs` you can use to avoid printing this line manually.

justfile

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+set dotenv-load
+
+day := `date +%d`
+dayWithout0 := trim_start_match(day, "0")
+year := "2022"
+file := "src/bin/" + day + ".rs"
+
+# Format, lint, and run the program for today.
+run: _output-folder
+    rustfmt src/bin/{{day}}.rs
+    cargo clippy
+    # Hide warning here because we just ran clippy
+    RUSTFLAGS=-Awarnings cargo run --release --bin {{day}} | tee "output/{{day}}.log"
+
+# Begin working on todays problem. Downloads input, creates template and opens the problem and code.
+begin: _input-folder
+    echo "use aoc2022::*;\n\nconst INPUT: &str = include_str!(\"../../input/{{day}}\");\n\nfn main() {\n\n}" >> {{file}}
+    curl --silent "https://adventofcode.com/{{year}}/day/{{dayWithout0}}/input" -H "Cookie: session=$AOC_SESSION" > "input/{{day}}"
+    code {{file}}
+    open "https://adventofcode.com/{{year}}/day/{{dayWithout0}}"
+
+# Submit a solution from the previously run program for the given level (1 or 2).
+submit level:
+    # Find the solution and pass it to the _submit command.
+    just _submit {{level}} $(pcregrep -o1 "^level-{{level}}-solution=(.*)$" output/{{day}}.log)
+
+_submit level solution:
+    curl --silent "https://adventofcode.com/{{year}}/day/{{dayWithout0}}/answer" \
+        -X "POST" \
+        -H "Cookie: session=$AOC_SESSION" \
+        --data "level={{level}}&answer={{solution}}" \
+        | xmllint --html --xpath "//main" - 2> /dev/null
+
+_output-folder:
+    mkdir -p output
+
+_input-folder:
+    mkdir -p input

src/lib.rs

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+/// Remember the passed value as the solution for the current puzzle.
+/// Prints a specially formatted line so that the solution can be found from the justfile.
+pub fn solved_level_1<S: ToString>(s: S) {
+    println!("level-1-solution={}", s.to_string());
+}
+
+/// See [solved_level_1].
+pub fn solved_level_2<S: ToString>(s: S) {
+    println!("level-2-solution={}", s.to_string());
+}