Add justfiles for 2021 solutions

2021/Justfile

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+@_run_day DAY PART INPUT:
+    just \
+        --working-directory "./day-{{DAY}}" \
+        --justfile "./day-{{DAY}}/Justfile" \
+        part {{PART}} {{INPUT}}
+
+day DAYS="all" PARTS="one,two" INPUT_FILE="":
+    #!/usr/bin/env ruby
+    days = "{{DAYS}}" == "all" ? Dir["day-*"] : "{{DAYS}}".split(",")
+    input_file = "{{INPUT_FILE}}".then do |f|
+        (f.include?("/") || f.empty?) ? f : "inputs/#{f}.txt"
+    end
+    days.each do |day|
+        day = day.delete_prefix("day-")
+        "{{PARTS}}".split(",").each do |part|
+            part_num = part == "one" ? 1 : 2
+            puts "Day #{day}.#{part_num}: " + `just _run_day #{day} #{part} '#{input_file}'`
+        end
+    end

2021/day-01/Justfile

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+@part PART INPUT_FILE="inputs/puzzle.txt":
+    ruby part_{{PART}}.rb {{INPUT_FILE}}

2021/day-02/Justfile

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+@part PART INPUT_FILE="inputs/puzzle.txt":
+    gnatmake -q -gnat2020 part_{{PART}}
+    ./part_{{PART}} {{INPUT_FILE}}
+
+clean:
+    rm *.ali *.o part_one part_two

2021/day-03/Justfile

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+@part PART INPUT_FILE="inputs/puzzle.txt":
+    perl part_{{PART}}.pl {{INPUT_FILE}}

2021/day-04/Justfile

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+@part PART INPUT_FILE="inputs/puzzle.txt":
+    go run part_{{PART}}.go {{INPUT_FILE}}

2021/day-05/Justfile

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+@part PART INPUT_FILE="inputs/puzzle.txt":
+    nim r --hints:off part_{{PART}}.nim {{INPUT_FILE}}

2021/day-06/Justfile

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+@part PART INPUT_FILE="inputs/puzzle.txt":
+    just _inko part_{{PART}}.inko {{INPUT_FILE}}
+
+_inko FILE INPUT_FILE:
+    #!/usr/bin/env sh
+    if type -p inko; then
+        inko run --include . {{FILE}} {{INPUT_FILE}}
+    else
+        echo "inko not found in PATH"
+    fi

2021/day-07/Justfile

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+@part PART INPUT_FILE="inputs/puzzle.txt":
+    just _swift part_{{PART}}.swift {{INPUT_FILE}}
+
+_swift FILE INPUT_FILE:
+    #!/usr/bin/env sh
+    if test -p swift; then
+        swift {{FILE}} {{INPUT_FILE}}
+    else
+        echo "swift not found in PATH"
+    fi

2021/day-08/Justfile

@@ -1,6 +1,6 @@
-@part_one INPUT_FILE:
-    mcs -out:part_one.exe common.cs part_one.cs
-    mono part_one.exe {{INPUT_FILE}}
+@part PART INPUT_FILE="inputs/puzzle.txt":
+    mcs -out:part_{{PART}}.exe common.cs part_{{PART}}.cs
+    mono part_{{PART}}.exe {{INPUT_FILE}}
 
 clean:
     rm *.exe