Created
May 17, 2019 06:52
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a simple implement of grep
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| val filesHere = (new java.io.File(args(0))).listFiles | |
| def fileLines(file: java.io.File) = | |
| scala.io.Source.fromFile(file).getLines().toList | |
| def grep(pattern: String) = | |
| for ( | |
| file <- filesHere | |
| if file.getName.endsWith(".scala"); | |
| line <- fileLines(file) | |
| if line.trim.matches(pattern) | |
| ) println(file + ": " + line.trim) | |
| grep(args(1)) |
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