Added csv, tsv or markdown table to "pretty markdown table" Script

Scripts/convertToMarkdownTable.js

@@ -0,0 +1,48 @@
+/**
+{
+  "api":1,
+  "name":"Convert to pretty markdown table",
+  "description":"Converts csv, tsv or markdown table into pretty markdown table format.",
+  "author":"xshoji",
+  "icon":"term",
+  "tags":"csv,tsv,md,markdown"
+}
+**/
+function main(input) {
+  input.text = convertToPrettyMarkdownTableFormat(input.text);
+}
+
+function convertToPrettyMarkdownTableFormat(input) {
+  const list = input.trim().replace(/^(\r?\n)+$/g, "\n").split("\n").map(v => v.replace(/^\||\|$/g, ""));
+  const delimiter = [`|`, `\t`, `","`, `,`].find(v => list[0].split(v).length > 1);
+  if (delimiter === `|`) {
+    // If input text is markdown table format, removes header separator.
+    list.splice(1, 1);
+  }
+  const tableElements = list.map(record => record.split(delimiter).map(v => v.trim()));
+  const calcBytes = (character) => {
+    let length = 0;
+    for (let i = 0; i < character.length; i++) {
+      const c = character.charCodeAt(i);
+      // Multibyte handling
+      (c >= 0x0 && c < 0x81) || (c === 0xf8f0) || (c >= 0xff61 && c < 0xffa0) || (c >= 0xf8f1 && c < 0xf8f4) ? length += 1 : length += 2;
+    }
+    return length;
+  };
+  const columnMaxLengthList = tableElements[0].map((v, i) => i).reduce((map, columnIndex) => {
+    let maxLength = 0;
+    tableElements.forEach(record => maxLength < calcBytes(record[columnIndex]) ? maxLength = calcBytes(record[columnIndex]) : null);
+    if (maxLength === 1) {
+      // Avoids markdown header line becomes only ":" ( ":-" is correct. ).
+      maxLength = 2;
+    }
+    map[columnIndex] = maxLength;
+    return map;
+  }, {})
+  const formattedTableElements = tableElements.map(record => record.map((value, columnIndex) => value + "".padEnd(columnMaxLengthList[columnIndex] - calcBytes(value), " ")));
+  const headerValues = formattedTableElements.shift();
+  const tableLine = headerValues.map(v => "".padStart(calcBytes(v), "-").replace(/^./, ":"));
+  formattedTableElements.unshift(tableLine);
+  formattedTableElements.unshift(headerValues);
+  return formattedTableElements.map(record => "| " + record.join(" | ") + " |").join("\n");
+}