Adding a formatting script.

dev/Project.toml

@@ -0,0 +1,2 @@
+[deps]
+JuliaFormatter = "98e50ef6-434e-11e9-1051-2b60c6c9e899"

dev/format.jl

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+using Pkg
+Pkg.activate(@__DIR__)
+Pkg.instantiate()
+
+using JuliaFormatter
+
+help = """
+Usage: format.jl [flags] [FILE/PATH]...
+
+Formats the given julia files using the ColBERT formatting options.
+If paths are given instead, it will format all *.jl files under
+the paths. If nothing is given, all changed julia files are formatted.
+
+    -v, --verbose
+        Print the name of the files being formatted with relevant details.
+
+    -h, --help
+        Print this help message.
+"""
+
+options = Dict{Symbol, Bool}()
+indices_to_remove = []      # used to delete options once processed
+
+for (index, arg) in enumerate(ARGS)
+    if arg[1] != '-'
+        continue
+    end
+    if arg in ["-v", "--verbose"]
+        opt = :verbose
+        push!(indices_to_remove, index)
+    elseif arg in ["-h", "--help"] 
+        opt = :help 
+        push!(indices_to_remove, index)
+    else
+        error("Option $arg is not supported.")
+    end
+    options[opt] = true
+end
+
+# remove options from args
+deleteat!(ARGS, indices_to_remove)
+
+# print help message if asked
+if haskey(options, :help)
+    write(stdout, help)
+    exit(0)
+end
+
+# otherwise format files
+if isempty(ARGS)
+    filenames = readlines(`git ls-files "*.jl"`)
+else
+    filenames = ARGS
+end
+
+write(stdout, "Formatting in progress.\n")
+format(filenames; options...)