# All files / src/lib/progress node-progress.ts

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93.75% Branches 60/64
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     /* eslint-disable */
    /*
     * Patch #1 for node-progress to fix display issue in certain terminals.
     * Issue related: https://github.com/MarkBind/markbind/issues/416
     * The **only** changes are based on the following PR and its comments:
     * https://github.com/visionmedia/node-progress/pull/168
     * As the above PR is not merged since 2017, this is a temporary patch
     * to fix the issue for markbind's usecase.
     */

    /*
     * Patch #2 for node-progress to allow logging without disturbing the progress bar.
     * The changes are based on the following PR:
     * https://github.com/visionmedia/node-progress/pull/155
     */

    /*
     * Patch #3 Rewrite the progress bar into TypeScript and make it ESM compatible.
     */

    /*!
     * node-progress
     * Copyright(c) 2011 TJ Holowaychuk <tj@vision-media.ca>
     * MIT Licensed
     */

    import { WriteStream } from 'tty';

    /**
     * Progress bar options interface
     */
    export interface ProgressBarOptions {
      /** Current completed index */
      curr?: number;
      /** Total number of ticks to complete */
      total: number;
      /** The displayed width of the progress bar defaulting to total */
      width?: number;
      /** The output stream defaulting to stderr */
      stream?: NodeJS.WriteStream;
      /** Head character defaulting to complete character */
      head?: string;
      /** Completion character defaulting to "=" */
      complete?: string;
      /** Incomplete character defaulting to "-" */
      incomplete?: string;
      /** Minimum time between updates in milliseconds defaulting to 16 */
      renderThrottle?: number;
      /** Optional function to call when the progress bar completes */
      callback?: (progressBar: ProgressBar) => void;
      /** Will clear the progress bar upon termination */
      clear?: boolean;
      /** Optional boolean to force stderr to be TTY */
      forceTTY?: boolean;
    }

    /**
     * Token object for progress bar template replacement
     */
    export interface ProgressBarTokens {
      [key: string]: string | number;
    }

    /**
     * Character configuration for progress bar display
     */
    interface ProgressBarChars {
      complete: string;
      incomplete: string;
      head: string;
    }

    /**
     * ProgressBar class for displaying progress in terminal
     *
     * Tokens:
     *   - `:bar` the progress bar itself
     *   - `:current` current tick number
     *   - `:total` total ticks
     *   - `:elapsed` time elapsed in seconds
     *   - `:percent` completion percentage
     *   - `:eta` eta in seconds
     *   - `:rate` rate of ticks per second
     */
    export class ProgressBar {
      public fmt: string;
      public curr: number;
      public total: number;
      public width: number;
      public clear: boolean;
      public chars: ProgressBarChars;
      public renderThrottle: number;
      public lastRender: number;
      public callback: (progressBar: ProgressBar) => void;
      public tokens: ProgressBarTokens;
      public lastDraw: string;
      public stream: NodeJS.WriteStream;
      public start?: Date;
      public complete?: boolean;

      /**
       * Initialize a ProgressBar with the given format string and options
       * @param fmt Format string for the progress bar
       * @param options Configuration options or total number
       */
      constructor(fmt: string, options: ProgressBarOptions | number) {
        // Handle options parameter - can be number (total) or options object
        let opts: ProgressBarOptions;
        if (typeof options === 'number') {
          opts = { total: options };
        } else {
          opts = options || {} as ProgressBarOptions;
          if (typeof fmt !== 'string') throw new Error('format required');
          if (typeof opts.total !== 'number') throw new Error('total required');
        }

        this.stream = opts.stream || process.stderr;

        // patch #1
        // options.forceTTY is undefined in git-bash on mintty Windows
        if (!process.stderr.isTTY) {
          const tty = WriteStream.prototype;
          Object.getOwnPropertyNames(tty).forEach((key: string) => {
            (process.stderr as any)[key] = (tty as any)[key];
          });
          (process.stderr as any).columns = 80;
        } // end patch

        this.fmt = fmt;
        this.curr = opts.curr || 0;
        this.total = opts.total;
        this.width = opts.width || this.total;
        this.clear = opts.clear || false;
        this.chars = {
          complete: opts.complete || '=',
          incomplete: opts.incomplete || '-',
          head: opts.head || (opts.complete || '=')
        };
        this.renderThrottle = opts.renderThrottle !== 0 ? (opts.renderThrottle || 16) : 0;
        this.lastRender = -Infinity;
        this.callback = opts.callback || (() => {});
        this.tokens = {};
        this.lastDraw = '';
      }

      /**
       * "tick" the progress bar with optional `len` and optional `tokens`.
       * @param len Length to increment or tokens object
       * @param tokens Optional tokens for template replacement
       */
      public tick(len?: number | ProgressBarTokens, tokens?: ProgressBarTokens): void {
        let increment: number = 1;

        if (len !== 0) {
          increment = (typeof len === 'number' ? len : 1) || 1;
        }

        // swap tokens
        if (typeof len === 'object') {
          tokens = len;
          increment = 1;
        }
        if (tokens) this.tokens = tokens;

        // start time for eta
        if (this.curr === 0) this.start = new Date();

        this.curr += increment;

        // try to render
        this.render();

        // progress complete
        if (this.curr >= this.total) {
          this.render(undefined, true);
          this.complete = true;
          this.terminate();
          this.callback(this);
          return;
        }
      }

      /**
       * Method to render the progress bar with optional `tokens` to place in the
       * progress bar's `fmt` field.
       * @param tokens Optional tokens for template replacement
       * @param force Force rendering even if throttled
       */
      public render(tokens?: ProgressBarTokens, force?: boolean): void {
        const forceRender = force !== undefined ? force : false;
        if (tokens) this.tokens = tokens;

        if (!this.stream.isTTY) return;

        const now = Date.now();
        const delta = now - this.lastRender;
        if (!forceRender && (delta < this.renderThrottle)) {
          return;
        } else {
          this.lastRender = now;
        }

        let ratio = this.curr / this.total;
        ratio = Math.min(Math.max(ratio, 0), 1);

        const percent = Math.floor(ratio * 100);
        let incomplete: string, complete: string, completeLength: number;
        const elapsed = this.start ? new Date().getTime() - this.start.getTime() : 0;
        const eta = (percent === 100) ? 0 : elapsed * (this.total / this.curr - 1);
        const rate = this.curr / (elapsed / 1000);

        /* populate the bar template with percentages and timestamps */
        let str = this.fmt
          .replace(':current', this.curr.toString())
          .replace(':total', this.total.toString())
          .replace(':elapsed', isNaN(elapsed) ? '0.0' : (elapsed / 1000).toFixed(1))
          .replace(':eta', (isNaN(eta) || !isFinite(eta)) ? '0.0' : (eta / 1000).toFixed(1))
          .replace(':percent', percent.toFixed(0) + '%')
          .replace(':rate', Math.round(rate).toString());

        /* compute the available space (non-zero) for the bar */
        let availableSpace = Math.max(0, (this.stream as any).columns - str.replace(':bar', '').length);
        if (availableSpace && process.platform === 'win32') {
          availableSpace = availableSpace - 1;
        }

        const width = Math.min(this.width, availableSpace);

        /* TODO: the following assumes the user has one ':bar' token */
        completeLength = Math.round(width * ratio);
        complete = Array(Math.max(0, completeLength + 1)).join(this.chars.complete);
        incomplete = Array(Math.max(0, width - completeLength + 1)).join(this.chars.incomplete);

        /* add head to the complete string */
        if (completeLength > 0) {
          complete = complete.slice(0, -1) + this.chars.head;
        }

        /* fill in the actual progress bar */
        str = str.replace(':bar', complete + incomplete);

        /* replace the extra tokens */
        if (this.tokens) {
          for (const key in this.tokens) {
            str = str.replace(':' + key, this.tokens[key].toString());
          }
        }

        if (this.lastDraw !== str) {
          (this.stream as any).cursorTo(0);
          this.stream.write(str);
          (this.stream as any).clearLine(1);
          this.lastDraw = str;
        }
      }

      /**
       * "update" the progress bar to represent an exact percentage.
       * The ratio (between 0 and 1) specified will be multiplied by `total` and
       * floored, representing the closest available "tick." For example, if a
       * progress bar has a length of 3 and `update(0.5)` is called, the progress
       * will be set to 1.
       *
       * A ratio of 0.5 will attempt to set the progress to halfway.
       * @param ratio The ratio (between 0 and 1 inclusive) to set the overall completion to
       * @param tokens Optional tokens for template replacement
       */
      public update(ratio: number, tokens?: ProgressBarTokens): void {
        const goal = Math.floor(ratio * this.total);
        const delta = goal - this.curr;

        this.tick(delta, tokens);
      }

      /**
       * "interrupt" the progress bar and write a message above it.
       * @param message The message to write
       */
      public interrupt(message: string): void {
        // clear the current line
        (this.stream as any).clearLine();
        // move the cursor to the start of the line
        (this.stream as any).cursorTo(0);
        // write the message text
        this.stream.write(message);
        // terminate the line after writing the message
        this.stream.write('\n');
        // re-display the progress bar with its lastDraw
        this.stream.write(this.lastDraw);
      }

      /**
       * Terminates a progress bar.
       */
      public terminate(): void {
        if (this.clear) {
          if ((this.stream as any).clearLine) {
            (this.stream as any).clearLine();
            (this.stream as any).cursorTo(0);
          }
        } else {
          this.stream.write('\n');
        }
      }

      // patch #2 Add interruptBegin & interruptEnd
      /**
       * Begin a interrupt so the user can manually write messages above the bar.
       */
      public interruptBegin(): void {
        (this.stream as any).clearLine();
        (this.stream as any).cursorTo(0);
      }

      /**
       * End a interrupt, rendering the last draw again.
       */
      public interruptEnd(): void {
        this.stream.write(this.lastDraw);
      } // end patch
    }