feat: initial commit

node_modules/inquirer/lib/utils/screen-manager.js

@@ -0,0 +1,142 @@
+'use strict';
+var _ = require('lodash');
+var util = require('./readline');
+var cliWidth = require('cli-width');
+var stripAnsi = require('strip-ansi');
+var stringWidth = require('string-width');
+
+function height(content) {
+  return content.split('\n').length;
+}
+
+function lastLine(content) {
+  return _.last(content.split('\n'));
+}
+
+class ScreenManager {
+  constructor(rl) {
+    // These variables are keeping information to allow correct prompt re-rendering
+    this.height = 0;
+    this.extraLinesUnderPrompt = 0;
+
+    this.rl = rl;
+  }
+
+  render(content, bottomContent) {
+    this.rl.output.unmute();
+    this.clean(this.extraLinesUnderPrompt);
+
+    /**
+     * Write message to screen and setPrompt to control backspace
+     */
+
+    var promptLine = lastLine(content);
+    var rawPromptLine = stripAnsi(promptLine);
+
+    // Remove the rl.line from our prompt. We can't rely on the content of
+    // rl.line (mainly because of the password prompt), so just rely on it's
+    // length.
+    var prompt = rawPromptLine;
+    if (this.rl.line.length) {
+      prompt = prompt.slice(0, -this.rl.line.length);
+    }
+
+    this.rl.setPrompt(prompt);
+
+    // SetPrompt will change cursor position, now we can get correct value
+    var cursorPos = this.rl._getCursorPos();
+    var width = this.normalizedCliWidth();
+
+    content = this.forceLineReturn(content, width);
+    if (bottomContent) {
+      bottomContent = this.forceLineReturn(bottomContent, width);
+    }
+
+    // Manually insert an extra line if we're at the end of the line.
+    // This prevent the cursor from appearing at the beginning of the
+    // current line.
+    if (rawPromptLine.length % width === 0) {
+      content += '\n';
+    }
+
+    var fullContent = content + (bottomContent ? '\n' + bottomContent : '');
+    this.rl.output.write(fullContent);
+
+    /**
+     * Re-adjust the cursor at the correct position.
+     */
+
+    // We need to consider parts of the prompt under the cursor as part of the bottom
+    // content in order to correctly cleanup and re-render.
+    var promptLineUpDiff = Math.floor(rawPromptLine.length / width) - cursorPos.rows;
+    var bottomContentHeight =
+      promptLineUpDiff + (bottomContent ? height(bottomContent) : 0);
+    if (bottomContentHeight > 0) {
+      util.up(this.rl, bottomContentHeight);
+    }
+
+    // Reset cursor at the beginning of the line
+    util.left(this.rl, stringWidth(lastLine(fullContent)));
+
+    // Adjust cursor on the right
+    if (cursorPos.cols > 0) {
+      util.right(this.rl, cursorPos.cols);
+    }
+
+    /**
+     * Set up state for next re-rendering
+     */
+    this.extraLinesUnderPrompt = bottomContentHeight;
+    this.height = height(fullContent);
+
+    this.rl.output.mute();
+  }
+
+  clean(extraLines) {
+    if (extraLines > 0) {
+      util.down(this.rl, extraLines);
+    }
+
+    util.clearLine(this.rl, this.height);
+  }
+
+  done() {
+    this.rl.setPrompt('');
+    this.rl.output.unmute();
+    this.rl.output.write('\n');
+  }
+
+  releaseCursor() {
+    if (this.extraLinesUnderPrompt > 0) {
+      util.down(this.rl, this.extraLinesUnderPrompt);
+    }
+  }
+
+  normalizedCliWidth() {
+    var width = cliWidth({
+      defaultWidth: 80,
+      output: this.rl.output
+    });
+    return width;
+  }
+
+  breakLines(lines, width) {
+    // Break lines who're longer than the cli width so we can normalize the natural line
+    // returns behavior across terminals.
+    width = width || this.normalizedCliWidth();
+    var regex = new RegExp('(?:(?:\\033[[0-9;]*m)*.?){1,' + width + '}', 'g');
+    return lines.map(line => {
+      var chunk = line.match(regex);
+      // Last match is always empty
+      chunk.pop();
+      return chunk || '';
+    });
+  }
+
+  forceLineReturn(content, width) {
+    width = width || this.normalizedCliWidth();
+    return _.flatten(this.breakLines(content.split('\n'), width)).join('\n');
+  }
+}
+
+module.exports = ScreenManager;