Fix duplicate output when more than 1 line (fixes #153)

lib/elements/autocomplete.js

@@ -2,7 +2,7 @@
 
 const color = require('kleur');
 const Prompt = require('./prompt');
-const { cursor } = require('sisteransi');
+const { erase, cursor } = require('sisteransi');
 const { style, clear, figures, strip } = require('../util');
 
 const getVal = (arr, i) => arr[i] && (arr[i].value || arr[i].title || arr[i]);
@@ -214,50 +214,36 @@ class AutocompletePrompt extends Prompt {
 
   render() {
     if (this.closed) return;
+    if (!this.firstRender) this.out.write(clear(this.outputText));
     super.render();
-    if (this.lineCount) this.out.write(cursor.down(this.lineCount));
 
-    let prompt = color.bold(`${style.symbol(this.done, this.aborted)} ${this.msg} `)
-      + `${style.delimiter(this.completing)} `;
-    let length = strip(prompt).length;
-
-    if (this.done && this.suggestions[this.page][this.select]) {
-        prompt += `${this.suggestions[this.page][this.select].title}`;
-    } else {
-        this.rendered = `${this.transform.render(this.input)}`;
-        length += this.rendered.length;
-        prompt += this.rendered;
-    }
+    this.outputText = [
+      color.bold(style.symbol(this.done, this.aborted)),
+      color.bold(this.msg),
+      style.delimiter(this.completing),
+      this.done && this.suggestions[this.page][this.select]
+          ? this.suggestions[this.page][this.select].title
+          : this.rendered = this.transform.render(this.input)
+    ].join(' ');
 
     if (!this.done) {
-      this.lineCount = this.suggestions[this.page].length;
-      let suggestions = this.suggestions[this.page].reduce((acc, item, i) =>
-        acc + `\n${i === this.select ? color.cyan(item.title) : item.title}`, '');
+      const suggestions = this.suggestions[this.page].reduce(
+          (acc, item, i) => acc + `\n${i === this.select ? color.cyan(item.title) : item.title}`, '');
       if (suggestions && !this.isFallback) {
-        prompt += suggestions;
+        this.outputText += suggestions;
         if (this.suggestions.length > 1) {
-          this.lineCount++;
-          prompt += color.blue(`\nPage ${this.page+1}/${this.suggestions.length}`);
+          this.outputText += color.blue(`\nPage ${this.page+1}/${this.suggestions.length}`);
         }
       } else {
         const fallbackIndex = getIndex(this.choices, this.fallback);
-        const fallbackTitle = fallbackIndex !== undefined
-          ? getTitle(this.choices, fallbackIndex)
-          : this.fallback;
-        prompt += `\n${color.gray(fallbackTitle)}`;
-        this.lineCount++;
+        const fallbackTitle = !isNaN(fallbackIndex)
+            ? getTitle(this.choices, fallbackIndex)
+            : this.fallback;
+        this.outputText += `\n${color.gray(fallbackTitle)}`;
       }
     }
 
-    this.out.write(this.clear + prompt);
-    this.clear = clear(prompt);
-
-    if (this.lineCount && !this.done) {
-      let pos = cursor.up(this.lineCount);
-      pos += cursor.left+cursor.to(length);
-      pos += cursor.move(-this.rendered.length+this.cursor*this.scale);
-      this.out.write(pos);
-    }
+    this.out.write(erase.line + cursor.to(0) + this.outputText);
   }
 }
 

lib/elements/confirm.js

@@ -1,6 +1,6 @@
 const color = require('kleur');
 const Prompt = require('./prompt');
-const { style } = require('../util');
+const { style, clear } = require('../util');
 const { erase, cursor } = require('sisteransi');
 
 /**
@@ -67,20 +67,18 @@ class ConfirmPrompt extends Prompt {
   render() {
     if (this.closed) return;
     if (this.firstRender) this.out.write(cursor.hide);
+    else this.out.write(clear(this.outputText));
     super.render();
-
-    this.out.write(
-      erase.line +
-        cursor.to(0) +
-        [
-          style.symbol(this.done, this.aborted),
-          color.bold(this.msg),
-          style.delimiter(this.done),
-          this.done
-            ? this.value ? this.yesMsg : this.noMsg
-            : color.gray(this.initialValue ? this.yesOption : this.noOption)
-        ].join(' ')
-    );
+
+    this.outputText = [
+      style.symbol(this.done, this.aborted),
+      color.bold(this.msg),
+      style.delimiter(this.done),
+      this.done ? (this.value ? this.yesMsg : this.noMsg)
+          : color.gray(this.initialValue ? this.yesOption : this.noOption)
+    ].join(' ');
+
+    this.out.write(erase.line + cursor.to(0) + this.outputText);
   }
 }
 

lib/elements/date.js

@@ -2,7 +2,7 @@
 
 const color = require('kleur');
 const Prompt = require('./prompt');
-const { style, clear, figures, strip } = require('../util');
+const { style, clear, figures } = require('../util');
 const { erase, cursor } = require('sisteransi');
 const { DatePart, Meridiem, Day, Hours, Milliseconds, Minutes, Month, Seconds, Year } = require('../dateparts');
 
@@ -26,6 +26,7 @@ const dfltLocales = {
   weekdaysShort: 'Sun,Mon,Tue,Wed,Thu,Fri,Sat'.split(',')
 }
 
+
 /**
  * DatePrompt Base Element
  * @param {Object} opts Options
@@ -108,7 +109,7 @@ class DatePrompt extends Prompt {
     this.out.write('\n');
     this.close();
   }
-  
+
   async validate() {
     let valid = await this.validator(this.value);
     if (typeof valid === 'string') {
@@ -179,34 +180,25 @@ class DatePrompt extends Prompt {
   render() {
     if (this.closed) return;
     if (this.firstRender) this.out.write(cursor.hide);
-    else this.out.write(erase.lines(1));
+    else this.out.write(clear(this.outputText));
     super.render();
-    let clear = erase.line + (this.lines ? erase.down(this.lines) : '') + cursor.to(0);
-    this.lines = 0;
-
-    let error = '';
-    if (this.error) {
-      let lines = this.errorMsg.split('\n');
-      error = lines.reduce((a, l, i) => a + `\n${i ? ` ` : figures.pointerSmall} ${color.red().italic(l)}`, ``);
-      this.lines = lines.length;
-    }
 
     // Print prompt
-    let prompt = [
+    this.outputText = [
       style.symbol(this.done, this.aborted),
       color.bold(this.msg),
       style.delimiter(false),
       this.parts.reduce((arr, p, idx) => arr.concat(idx === this.cursor && !this.done ? color.cyan().underline(p.toString()) : p), [])
-        .join(''),
+          .join('')
     ].join(' ');
-    
-    let position = '';
-    if (this.lines) {
-        position += cursor.up(this.lines);
-        position += cursor.left+cursor.to(strip(prompt).length);
+
+    // Print error
+    if (this.error) {
+      this.outputText += this.errorMsg.split('\n').reduce(
+          (a, l, i) => a + `\n${i ? ` ` : figures.pointerSmall} ${color.red().italic(l)}`, ``);
     }
 
-    this.out.write(clear+prompt+error+position);
+    this.out.write(erase.line + cursor.to(0) + this.outputText);
   }
 }
 

lib/elements/number.js

@@ -1,7 +1,7 @@
 const color = require('kleur');
 const Prompt = require('./prompt');
 const { cursor, erase } = require('sisteransi');
-const { style, clear, figures, strip } = require('../util');
+const { style, figures, ansi, clear, lines } = require('../util');
 
 const isNumber = /[0-9]/;
 const isDef = any => any !== undefined;
@@ -170,32 +170,30 @@ class NumberPrompt extends Prompt {
 
   render() {
     if (this.closed) return;
-    super.render();
-    let clear = erase.line + (this.lines ? erase.down(this.lines) : ``) + cursor.to(0);
-    this.lines = 0;
-
-    let error = ``;
-    if (this.error) {
-      let lines = this.errorMsg.split(`\n`);
-      error += lines.reduce((a, l, i) => a + `\n${i ? ` ` : figures.pointerSmall} ${color.red().italic(l)}`, ``);
-      this.lines = lines.length;
+    if (!this.firstRender) {
+      if (this.outputError)
+        this.out.write(cursor.down(lines(this.outputError) - 1) + clear(this.outputError));
+      this.out.write(clear(this.outputText));
     }
+    super.render();
+    this.outputError = '';
 
-    let underline = !this.done || (!this.done && !this.placeholder);
-    let prompt = [
+    // Print prompt
+    this.outputText = [
       style.symbol(this.done, this.aborted),
       color.bold(this.msg),
       style.delimiter(this.done),
-      underline ? color[this.color]().underline(this.rendered) : this.rendered
+      !this.done || (!this.done && !this.placeholder)
+          ? color[this.color]().underline(this.rendered) : this.rendered
     ].join(` `);
 
-    let position = ``;
-    if (this.lines) {
-      position += cursor.up(this.lines);
-      position += cursor.left+cursor.to(strip(prompt).length);
+    // Print error
+    if (this.error) {
+      this.outputError += this.errorMsg.split(`\n`)
+          .reduce((a, l, i) => a + `\n${i ? ` ` : figures.pointerSmall} ${color.red().italic(l)}`, ``);
     }
 
-    this.out.write(clear+prompt+error+position);
+    this.out.write(erase.line + cursor.to(0) + this.outputText + ansi.save + this.outputError + ansi.restore);
   }
 }
 

lib/elements/prompt.js

@@ -23,7 +23,7 @@ class Prompt extends EventEmitter {
     readline.emitKeypressEvents(this.in, rl);
 
     if (this.in.isTTY) this.in.setRawMode(true);
-    const isSelect = ['SelectPrompt', 'MultiselectPrompt'].indexOf(this.constructor.name) > -1;
+    const isSelect = [ 'SelectPrompt', 'MultiselectPrompt' ].indexOf(this.constructor.name) > -1;
     const keypress = (str, key) => {
       let a = action(key, isSelect);
       if (a === false) {

lib/elements/select.js

@@ -3,7 +3,7 @@
 const color = require('kleur');
 const Prompt = require('./prompt');
 const { style, clear, figures } = require('../util');
-const { erase, cursor } = require('sisteransi');
+const { cursor } = require('sisteransi');
 
 /**
  * SelectPrompt Base Element
@@ -22,7 +22,7 @@ class SelectPrompt extends Prompt {
     this.hint = opts.hint || '- Use arrow-keys. Return to submit.';
     this.warn = opts.warn || '- This option is disabled';
     this.cursor = opts.initial || 0;
-    this.choices = opts.choices.map((ch, idx) => {
+    this.choices = opts.choices.map((ch, idx) => {
       if (typeof ch === 'string')
         ch = {title: ch, value: idx};
       return {
@@ -107,37 +107,37 @@ class SelectPrompt extends Prompt {
   render() {
     if (this.closed) return;
     if (this.firstRender) this.out.write(cursor.hide);
-    else this.out.write(erase.lines(this.choices.length + 1));
+    else this.out.write(clear(this.outputText));
     super.render();
 
     // Print prompt
-    this.out.write([
-        style.symbol(this.done, this.aborted),
-        color.bold(this.msg),
-        style.delimiter(false),
-        this.done ? this.selection.title : this.selection.disabled
-                  ? color.yellow(this.warn) : color.gray(this.hint)
-      ].join(' '));
+    this.outputText = [
+      style.symbol(this.done, this.aborted),
+      color.bold(this.msg),
+      style.delimiter(false),
+      this.done ? this.selection.title : this.selection.disabled
+          ? color.yellow(this.warn) : color.gray(this.hint)
+    ].join(' ');
 
     // Print choices
     if (!this.done) {
-      this.out.write(
-        '\n' +
+      this.outputText += '\n' +
           this.choices
-            .map((v, i) => {
-              let title, prefix;
-              if (v.disabled) {
-                title = this.cursor === i ? color.gray().underline(v.title) : color.strikethrough().gray(v.title);
-                prefix = this.cursor === i ? color.bold().gray(figures.pointer) + ' ' : '  ';
-              } else {
-                title = this.cursor === i ? color.cyan().underline(v.title) : v.title;
-                prefix = this.cursor === i ? color.cyan(figures.pointer) + ' ' : '  ';
-              }
-              return `${prefix} ${title}`;
-            })
-            .join('\n')
-      );
+              .map((v, i) => {
+                let title, prefix;
+                if (v.disabled) {
+                  title = this.cursor === i ? color.gray().underline(v.title) : color.strikethrough().gray(v.title);
+                  prefix = this.cursor === i ? color.bold().gray(figures.pointer) + ' ' : '  ';
+                } else {
+                  title = this.cursor === i ? color.cyan().underline(v.title) : v.title;
+                  prefix = this.cursor === i ? color.cyan(figures.pointer) + ' ' : '  ';
+                }
+                return `${prefix} ${title}`;
+              })
+              .join('\n');
     }
+
+    this.out.write(this.outputText);
   }
 }
 

lib/elements/text.js

@@ -1,7 +1,7 @@
 const color = require('kleur');
 const Prompt = require('./prompt');
-const { cursor } = require('sisteransi');
-const { style, clear, strip, figures } = require('../util');
+const { erase, cursor } = require('sisteransi');
+const { style, clear, lines, ansi, figures } = require('../util');
 
 /**
  * TextPrompt Base Element
@@ -154,36 +154,27 @@ class TextPrompt extends Prompt {
 
   render() {
     if (this.closed) return;
+    if (!this.firstRender) {
+      if (this.outputError)
+        this.out.write(cursor.down(lines(this.outputError) - 1) + clear(this.outputError));
+      this.out.write(clear(this.outputText));
+    }
     super.render();
-    let erase = (this.lines ? cursor.down(this.lines) : ``)+this.clear;
-    this.lines = 0;
+    this.outputError = '';
 
-    let prompt = [
+    this.outputText = [
       style.symbol(this.done, this.aborted),
       color.bold(this.msg),
       style.delimiter(this.done),
       this.red ? color.red(this.rendered) : this.rendered
     ].join(` `);
 
-    let error = ``;
     if (this.error) {
-      let lines = this.errorMsg.split(`\n`);
-      error += lines.reduce((a, l, i) => a += `\n${i ? ' ' : figures.pointerSmall} ${color.red().italic(l)}`, ``);
-      this.lines = lines.length;
-    }
-
-    let position = ``;
-    if (this.lines) {
-      position += cursor.up(this.lines);
-      position += cursor.left+cursor.to(strip(prompt).length);
+      this.outputError += this.errorMsg.split(`\n`)
+          .reduce((a, l, i) => a + `\n${i ? ' ' : figures.pointerSmall} ${color.red().italic(l)}`, ``);
     }
-    position += cursor.move(this.placeholder ?
-      -this.initial.length*this.scale :
-      -this.rendered.length+this.cursor*this.scale
-    );
 
-    this.out.write(erase+prompt+error+position);
-    this.clear = clear(prompt+error);
+    this.out.write(erase.line + cursor.to(0) + this.outputText + ansi.save + this.outputError + ansi.restore);
   }
 }