Current Dev State

static/js/ketcher2/node_modules/shelljs/src/tail.js

@@ -0,0 +1,79 @@
+var common = require('./common');
+var fs = require('fs');
+
+common.register('tail', _tail, {
+  canReceivePipe: true,
+  cmdOptions: {
+    'n': 'numLines',
+  },
+});
+
+//@
+//@ ### tail([{'-n': \<num\>},] file [, file ...])
+//@ ### tail([{'-n': \<num\>},] file_array)
+//@ Available options:
+//@
+//@ + `-n <num>`: Show the last `<num>` lines of the files
+//@
+//@ Examples:
+//@
+//@ ```javascript
+//@ var str = tail({'-n': 1}, 'file*.txt');
+//@ var str = tail('file1', 'file2');
+//@ var str = tail(['file1', 'file2']); // same as above
+//@ ```
+//@
+//@ Read the end of a file.
+function _tail(options, files) {
+  var tail = [];
+  var pipe = common.readFromPipe();
+
+  if (!files && !pipe) common.error('no paths given');
+
+  var idx = 1;
+  if (options.numLines === true) {
+    idx = 2;
+    options.numLines = Number(arguments[1]);
+  } else if (options.numLines === false) {
+    options.numLines = 10;
+  }
+  options.numLines = -1 * Math.abs(options.numLines);
+  files = [].slice.call(arguments, idx);
+
+  if (pipe) {
+    files.unshift('-');
+  }
+
+  var shouldAppendNewline = false;
+  files.forEach(function (file) {
+    if (file !== '-') {
+      if (!fs.existsSync(file)) {
+        common.error('no such file or directory: ' + file, { continue: true });
+        return;
+      } else if (fs.statSync(file).isDirectory()) {
+        common.error("error reading '" + file + "': Is a directory", {
+          continue: true,
+        });
+        return;
+      }
+    }
+
+    var contents = file === '-' ? pipe : fs.readFileSync(file, 'utf8');
+
+    var lines = contents.split('\n');
+    if (lines[lines.length - 1] === '') {
+      lines.pop();
+      shouldAppendNewline = true;
+    } else {
+      shouldAppendNewline = false;
+    }
+
+    tail = tail.concat(lines.slice(options.numLines));
+  });
+
+  if (shouldAppendNewline) {
+    tail.push(''); // to add a trailing newline once we join
+  }
+  return tail.join('\n');
+}
+module.exports = _tail;