[react] feat: Improved error handling when pattern drafting fails (#205)

If drafting a part fails, the logs store contains an array [message, stacktrace] instead of a simple string. Handle this in the LogView.

Also display an error message in the DraftView when there were errors during drafting.

![image](/attachments/62cdebe3-7825-4382-88fd-395337cda58b)

after clicking the button:

![image](/attachments/f909887b-b9bd-467e-9e13-f850c38d76b3)

(could also display the stack traces, but they're quite unhelpful and you can find them in the browser console anyway, the code for that is commented out)

Closes #163

Reviewed-on: https://codeberg.org/freesewing/freesewing/pulls/205
Reviewed-by: Joost De Cock <joostdecock@noreply.codeberg.org>
Co-authored-by: Jonathan Haas <haasjona@gmail.com>
Co-committed-by: Jonathan Haas <haasjona@gmail.com>

packages/react/components/Editor/components/views/DraftErrorHandler.mjs

@@ -0,0 +1,59 @@
+// Dependencies
+import React, { useState } from 'react'
+import { Popout } from '../../../Popout/index.mjs'
+import { CloseIcon, ExpandIcon } from '../../../Icon/index.mjs'
+import { Link } from '../../../Link/index.mjs'
+import { LogEntry } from './LogEntry.mjs'
+
+export const DraftErrorHandler = ({ failure, errors }) => {
+  const [expanded, setExpanded] = useState(false)
+  const [hidden, setHidden] = useState(false)
+
+  if (hidden || (!failure && errors.length === 0)) {
+    return null
+  }
+
+  return (
+    <Popout error>
+      <p>
+        Sorry, there were problems drafting your pattern with the given measurements and options.
+      </p>
+      <p>
+        Please double check your measurements according to{' '}
+        <Link href="/docs/measurements/">our documentation</Link>. Also check{' '}
+        <Link href="https://v4.freesewing.org/docs/about/faq/measurements-issues/">
+          our common measurement issues FAQ entry
+        </Link>
+        .
+      </p>
+      <p>
+        If you believe your measurements are correct and/or if you'd like further assistance, you
+        can ask for help <Link href="https://forum.freesewing.eu">on our forum</Link>,{' '}
+        <Link href="https://discord.freesewing.org">our Discord server</Link>, or{' '}
+        <Link href="https://codeberg.org/freesewing/freesewing/issues">report an issue</Link>.
+      </p>
+
+      <div className={'tw-mt-4'}>
+        <button
+          className={`tw-daisy-btn tw-daisy-btn-primary`}
+          onClick={() => setExpanded(!expanded)}
+        >
+          <ExpandIcon />
+          Show error details
+        </button>
+        <button className={`tw-daisy-btn tw-ml-4`} onClick={() => setHidden(true)}>
+          <CloseIcon />
+          Hide
+        </button>
+      </div>
+      {expanded ? (
+        <div className={'tw-mt-8'}>
+          {failure ? <LogEntry key="failure" logEntry={failure} /> : null}
+          {errors.map((line, i) => (
+            <LogEntry key={i} logEntry={line} />
+          ))}
+        </div>
+      ) : null}
+    </Popout>
+  )
+}

packages/react/components/Editor/components/views/DraftView.mjs

@@ -1,10 +1,11 @@
 // Dependencies
 import React from 'react'
-import { draft, missingMeasurements, bundlePatternTranslations } from '../../lib/index.mjs'
+import { bundlePatternTranslations, draft, missingMeasurements } from '../../lib/index.mjs'
 // Components
 import { Null } from '@freesewing/react/components/Null'
 import { ZoomablePattern } from '../ZoomablePattern.mjs'
 import { PatternLayout } from '../PatternLayout.mjs'
+import { DraftErrorHandler } from './DraftErrorHandler.mjs'
 
 /**
  * The draft view allows users to tweak their pattern
@@ -38,7 +39,7 @@ export const DraftView = ({ Design, state, update, config, plugins = [], PluginO
   /*
    * First, attempt to draft
    */
-  const { pattern } = draft(Design, state.settings, plugins)
+  const { pattern, failure, errors } = draft(Design, state.settings, plugins)
 
   /*
    * Create object holding strings for translation
@@ -52,6 +53,7 @@ export const DraftView = ({ Design, state, update, config, plugins = [], PluginO
       const __html = pattern.render()
       output = (
         <>
+          <DraftErrorHandler {...{ failure, errors }} />
           <PluginOutput {...{ pattern, Design, state, update, config }} />
           <ZoomablePattern update={update}>
             <div className="tw-w-full tw-h-full" dangerouslySetInnerHTML={{ __html }} />
@@ -65,6 +67,7 @@ export const DraftView = ({ Design, state, update, config, plugins = [], PluginO
     renderProps = pattern.getRenderProps()
     output = (
       <>
+        <DraftErrorHandler {...{ failure, errors }} />
         <PluginOutput {...{ pattern, Design, state, update, config, strings }} />
         <ZoomablePattern
           renderProps={renderProps}

packages/react/components/Editor/components/views/InspectView.mjs

@@ -9,6 +9,7 @@ import { Null } from '@freesewing/react/components/Null'
 import { ZoomablePattern } from '../ZoomablePattern.mjs'
 import { PatternLayout } from '../PatternLayout.mjs'
 import { Xray } from '@freesewing/react/components/Xray'
+import { DraftErrorHandler } from './DraftErrorHandler.mjs'
 
 /**
  * The inspect view allows users to inspect their pattern
@@ -47,7 +48,7 @@ export const InspectView = ({ Design, state, update, config }) => {
   /*
    * First, attempt to draft
    */
-  const { pattern } = draft(Design, state.settings)
+  const { pattern, failure, errors } = draft(Design, state.settings, plugins)
 
   /*
    * Create object holding strings for translation
@@ -57,6 +58,7 @@ export const InspectView = ({ Design, state, update, config }) => {
   const renderProps = pattern.getRenderProps()
   const output = (
     <>
+      <DraftErrorHandler {...{ failure, errors }} />
       <ZoomablePattern
         renderProps={renderProps}
         patternLocale={state.locale || 'en'}

packages/react/components/Editor/components/views/LayoutView.mjs

@@ -7,6 +7,7 @@ import { draft } from '../../lib/index.mjs'
 // Components
 import { PatternLayout } from '../PatternLayout.mjs'
 import { MovablePattern } from '../MovablePattern.mjs'
+import { DraftErrorHandler } from './DraftErrorHandler.mjs'
 
 export const LayoutView = (props) => {
   const { config, state, update, Design } = props
@@ -23,9 +24,10 @@ export const LayoutView = (props) => {
    * Now draft the pattern
    */
   const { pattern, failure, errors } = draft(Design, settings, [tilerPlugin(pageSettings)])
-  if (failure) return <p>Draft failed. FIXME: Handle this gracefully.</p>
 
   const output = (
+    <>
+      <DraftErrorHandler {...{ failure, errors }} />
       <MovablePattern
         {...{
           update,
@@ -34,6 +36,7 @@ export const LayoutView = (props) => {
           state,
         }}
       />
+    </>
   )
 
   return <PatternLayout {...{ update, Design, output, state, pattern, config }} />

packages/react/components/Editor/components/views/LogEntry.mjs

@@ -0,0 +1,14 @@
+import React from 'react'
+import Markdown from 'react-markdown'
+
+export const LogEntry = ({ logEntry }) => (
+  <>
+    <div className="log-entry tw-mb-2">
+      <Markdown>{Array.isArray(logEntry) ? logEntry[0] : logEntry}</Markdown>
+    </div>
+    {/* uncomment to enable stacktrace view
+     Array.isArray(logEntry) && logEntry[1].stack ? (
+      <Highlight title="Stacktrace" raw={logEntry[1]?.stack} />
+    ) : null */}
+  </>
+)

packages/react/components/Editor/components/views/LogView.mjs

@@ -3,10 +3,10 @@ import { draft } from '../../lib/index.mjs'
 // Hooks
 import React from 'react'
 // Components
-import Markdown from 'react-markdown'
 import { H1, H3 } from '@freesewing/react/components/Heading'
 import { HeaderMenu } from '../HeaderMenu.mjs'
 import { Tabs, Tab } from '@freesewing/react/components/Tab'
+import { LogEntry } from './LogEntry.mjs'
 
 // The log levels
 const levels = ['error', 'warn', 'info', 'debug']
@@ -36,7 +36,7 @@ export const LogView = (props) => {
                   <>
                     <H3>{level}</H3>
                     {pattern.setStores[0].logs[level].map((line, i) => (
-                      <Markdown key={i}>{line}</Markdown>
+                      <LogEntry key={i} logEntry={line} />
                     ))}
                   </>
                 ) : null}
@@ -50,7 +50,7 @@ export const LogView = (props) => {
                   <>
                     <H3>{level}</H3>
                     {pattern.store.logs[level].map((line, i) => (
-                      <Markdown key={i}>{line}</Markdown>
+                      <LogEntry key={i} logEntry={line} />
                     ))}
                   </>
                 ) : null}