From 9aeef93245a5e44f2bc5dce4e150f33d4ba4d229 Mon Sep 17 00:00:00 2001
From: Sergey Linev <S.Linev@gsi.de>
Date: Tue, 24 Sep 2024 15:50:13 +0200
Subject: [PATCH] Try several dirs when loading font

---
 modules/base/BasePainter.mjs | 20 +++-----------------
 modules/base/FontHandler.mjs | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 18 deletions(-)

diff --git a/modules/base/BasePainter.mjs b/modules/base/BasePainter.mjs
index 210ee9c78..88c375161 100644
--- a/modules/base/BasePainter.mjs
+++ b/modules/base/BasePainter.mjs
@@ -1,6 +1,6 @@
 import { select as d3_select } from '../d3.mjs';
-import { settings, internals, isNodeJs, isFunc, isStr, isObject, btoa_func, getDocument, source_dir, httpRequest } from '../core.mjs';
-import { detectFont, addCustomFont, getCustomFont, FontHandler } from './FontHandler.mjs';
+import { settings, internals, isNodeJs, isFunc, isStr, isObject, btoa_func, getDocument } from '../core.mjs';
+import { detectFont, addCustomFont, getCustomFont, loadFontFile, FontHandler } from './FontHandler.mjs';
 import { approximateLabelWidth, replaceSymbolsInTextNode } from './latex.mjs';
 import { getColor } from './colors.mjs';
 
@@ -754,20 +754,6 @@ function addHighlightStyle(elem, drag) {
    }
 }
 
-/** @summary Read font file from some pre-configured locations
-  * @return {Promise} with base64 code of the font
-  * @private */
-async function readFontFile(fname) {
-   return isNodeJs() ? import('fs').then(fs => {
-      let path = 'fonts/' + fname;
-      if (source_dir.indexOf('file://') === 0)
-         path = source_dir.slice(7) + path;
-      else
-         path = '../../' + path;
-      return fs.readFileSync(path).toString('base64');
-   }) : httpRequest(source_dir + 'fonts/' + fname, 'bin').then(buf => btoa_func(buf));
-}
-
 /** @summary Create pdf for existing SVG element
   * @return {Promise} with produced PDF file as url string
   * @private */
@@ -856,7 +842,7 @@ async function svgToPDF(args, as_buffer) {
 
       if (need_symbols && !custom_fonts.symbol) {
          if (!getCustomFont('symbol'))
-            pr2 = readFontFile('symbol.ttf').then(base64 => addCustomFont(25, 'symbol', 'ttf', base64));
+            pr2 = loadFontFile('symbol.ttf').then(base64 => addCustomFont(25, 'symbol', 'ttf', base64));
 
          pr2 = pr2.then(() => {
             const fh = getCustomFont('symbol'),
diff --git a/modules/base/FontHandler.mjs b/modules/base/FontHandler.mjs
index 8a649e6ad..c480a61d2 100644
--- a/modules/base/FontHandler.mjs
+++ b/modules/base/FontHandler.mjs
@@ -1,3 +1,6 @@
+import { isNodeJs, httpRequest, btoa_func, source_dir } from '../core.mjs';
+
+
 const kArial = 'Arial', kTimes = 'Times New Roman', kCourier = 'Courier New', kVerdana = 'Verdana', kSymbol = 'Symbol', kWingdings = 'Wingdings',
 // average width taken from symbols.html, counted only for letters and digits
 root_fonts = [null,  // index 0 not exists
@@ -215,4 +218,31 @@ function detectFont(node) {
    return handler;
 }
 
-export { FontHandler, addCustomFont, getCustomFont, detectFont };
+/** @summary Read font file from some pre-configured locations
+  * @return {Promise} with base64 code of the font
+  * @private */
+async function loadFontFile(fname) {
+   const locations = [source_dir + 'fonts/'];
+   if (isNodeJs())
+      locations.push('../../fonts/');
+
+   console.log('Trying to load ', fname, 'from', locations);
+
+   async function tryNext() {
+      if (locations.length === 0)
+         throw new Error(`Fail to load ${fname} font`);
+      let path = locations.shift() + fname;
+      const pr = isNodeJs() ? import('fs').then(fs => {
+         if (path.indexOf('file://') === 0)
+            path = path.slice(7);
+         return fs.readFileSync(path).toString('base64');
+      }) : httpRequest(path, 'bin').then(buf => btoa_func(buf));
+
+      return pr.catch(() => tryNext());
+   }
+
+   return tryNext();
+}
+
+
+export { FontHandler, addCustomFont, getCustomFont, detectFont, loadFontFile };