63 lines
2.2 KiB
Text
63 lines
2.2 KiB
Text
import java.nio.charset.StandardCharsets
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import java.nio.file.Files
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import java.nio.file.Paths
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enum class AlignFunction {
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LEFT { override fun invoke(s: String, l: Int) = ("%-" + l + 's').format(("%" + s.length + 's').format(s)) },
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RIGHT { override fun invoke(s: String, l: Int) = ("%-" + l + 's').format(("%" + l + 's').format(s)) },
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CENTER { override fun invoke(s: String, l: Int) = ("%-" + l + 's').format(("%" + ((l + s.length) / 2) + 's').format(s)) };
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abstract operator fun invoke(s: String, l: Int): String
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}
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/** Aligns fields into columns, separated by "|".
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* @constructor Initializes columns aligner from lines in a list of strings.
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* @property lines Lines in a single string. Empty string does form a column.
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*/
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class ColumnAligner(val lines: List<String>) {
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operator fun invoke(a: AlignFunction) : String {
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var result = ""
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for (lineWords in words) {
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for (i in lineWords.indices) {
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if (i == 0)
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result += '|'
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result += a(lineWords[i], column_widths[i])
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result += '|'
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}
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result += '\n'
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}
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return result
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}
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private val words = arrayListOf<Array<String>>()
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private val column_widths = arrayListOf<Int>()
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init {
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lines.forEach {
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val lineWords = java.lang.String(it).split("\\$")
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words += lineWords
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for (i in lineWords.indices) {
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if (i >= column_widths.size) {
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column_widths += lineWords[i].length
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} else {
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column_widths[i] = Math.max(column_widths[i], lineWords[i].length)
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}
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}
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}
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}
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}
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fun main(args: Array<String>) {
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if (args.isEmpty()) {
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println("Usage: ColumnAligner file [L|R|C]")
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return
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}
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val ca = ColumnAligner(Files.readAllLines(Paths.get(args[0]), StandardCharsets.UTF_8))
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val alignment = if (args.size >= 2) args[1] else "L"
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when (alignment) {
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"L" -> print(ca(AlignFunction.LEFT))
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"R" -> print(ca(AlignFunction.RIGHT))
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"C" -> print(ca(AlignFunction.CENTER))
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else -> System.err.println("Error! Unknown alignment: " + alignment)
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}
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}
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