Add a (slightly) better CLI #10
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@samis Thanks! Could you squash the commits? |
mverzilli
suggested changes
Feb 19, 2017
| output_file = "" | ||
| OptionParser.parse! do |parser| | ||
| parser.banner = "Usage: crystal_lib [arguments]" | ||
| parser.on("-o FILE", "--output=FILE", "The file to output the generated code to.") { |filename| output_file = filename } |
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Clarify the default if it's not specified (for example: "defaults to output.cr"). Actually, it'd be nice if the default took the same name as the input file, except with the cr extension.
| OptionParser.parse! do |parser| | ||
| parser.banner = "Usage: crystal_lib [arguments]" | ||
| parser.on("-o FILE", "--output=FILE", "The file to output the generated code to.") { |filename| output_file = filename } | ||
| parser.on("-h", "--help", "Show this help") { puts parser; Process.exit(0) } |
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We should provide an option to print to the console, as it works currently.
| output_file = "output.cr" | ||
| end | ||
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| node = Crystal::Parser.parse(ARGF.gets_to_end) |
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This breaks when the user doesn't provide an input file. It should show usage instead.
| require "option_parser" | ||
| output_file = "" | ||
| OptionParser.parse! do |parser| | ||
| parser.banner = "Usage: crystal_lib [arguments]" |
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Some sort of clarification that the last argument should be the input file is missing here.
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This adds a minimal, but still working CLI allowing to specify both the input and the output files on the command line. While it's very basic and does not support reading from stdin or outputting to stdout, it does work.