feat: Add syntax highlighting to agent message code blocks by charlesvien · Pull Request #1119 · PostHog/Twig

charlesvien · 2026-03-04T23:26:50Z

Closes #1050

Add Lezer-based syntax highlighting using existing CodeMirror language parsers
Create HighlightedCode component for rendering colorized code segments
Wire fenced code blocks in MarkdownRenderer to use the new highlighter
Support 20+ languages (TS, JS, Python, Rust, Go, HTML, CSS, SQL, etc.)
Include both dark and light theme palettes with parser caching

charlesvien · 2026-03-04T23:27:14Z

fix: Navigate on notification click, auto-scroll on tab focus, prevent escape canceling agent in dialog #1122
feat: Add configurable diff open mode setting #1120
feat: Add syntax highlighting to agent message code blocks #1119 👈 (View in Graphite)
feat: Auto-regenerate task titles and suppress queued notifications #1117 : 1 other dependent PR (#1118 )
fix: Collapse plan edits, defer shell creation and fix update notification #1115
fix: Handle archiving tasks without workspace association #1114
fix: Fix branch selector overflow and polish tool call rows #1113
fix: Stop embedding file content in prompts and fix image preview #1112
feat: Implement session self-recovery via S3 history recreation #1099
feat: Upgrade Claude Code adapter (see desc) #1091 : 1 other dependent PR (#1093 )
fix: Update title prompt, scope reauth during onboarding, header overflow #1098 : 1 other dependent PR (#1100 )
feat: Improve agent session lifeycle and bump SDKs #1089
fix: Address feedback nits and bug reports (see desc) #1092
main

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charlesvien · 2026-03-05T09:33:15Z

Merge activity

Mar 5, 9:33 AM UTC: Graphite rebased this pull request as part of a merge.
Mar 5, 9:35 AM UTC: @charlesvien merged this pull request with Graphite.

charlesvien changed the title ~~Add syntax highlighting to agent message code blocks~~ feat: Add syntax highlighting to agent message code blocks Mar 4, 2026

This was referenced Mar 4, 2026

fix: Collapse plan edits, defer shell creation and fix update notification #1115

Merged

feat: Auto-regenerate task titles and suppress queued notifications #1117

Merged

This was referenced Mar 4, 2026

Auto-regenerate task titles during conversation #1118

Closed

feat: Add configurable diff open mode setting #1120

Merged

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch from 0aa04cf to 458c625 Compare March 4, 2026 23:36

charlesvien force-pushed the 03-04-syntax_highlighting branch from edc7d79 to 81182bd Compare March 4, 2026 23:36

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch from 458c625 to 4284713 Compare March 4, 2026 23:57

charlesvien force-pushed the 03-04-syntax_highlighting branch from 81182bd to 37a9ac1 Compare March 4, 2026 23:57

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch from 4284713 to e244743 Compare March 5, 2026 01:58

charlesvien force-pushed the 03-04-syntax_highlighting branch from 37a9ac1 to ed67f0f Compare March 5, 2026 01:58

charlesvien mentioned this pull request Mar 5, 2026

fix: Navigate on notification click, auto-scroll on tab focus, prevent escape canceling agent in dialog #1122

Merged

charlesvien force-pushed the 03-04-syntax_highlighting branch from ed67f0f to 3db5a1c Compare March 5, 2026 04:44

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch from e244743 to 55cff69 Compare March 5, 2026 04:44

charlesvien marked this pull request as ready for review March 5, 2026 04:47

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch from 55cff69 to ec0db5f Compare March 5, 2026 05:20

charlesvien force-pushed the 03-04-syntax_highlighting branch from dda239f to ca24cdf Compare March 5, 2026 05:20

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch from ec0db5f to ea1bb04 Compare March 5, 2026 05:23

charlesvien force-pushed the 03-04-syntax_highlighting branch from ca24cdf to eefc2af Compare March 5, 2026 05:23

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch from ea1bb04 to 8d5d350 Compare March 5, 2026 07:20

charlesvien force-pushed the 03-04-syntax_highlighting branch from eefc2af to 5ba2910 Compare March 5, 2026 07:20

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch from 8d5d350 to 4d87100 Compare March 5, 2026 07:52

charlesvien force-pushed the 03-04-syntax_highlighting branch from 5ba2910 to 29c8d7f Compare March 5, 2026 07:52

joshsny approved these changes Mar 5, 2026

View reviewed changes

charlesvien force-pushed the 03-04-syntax_highlighting branch from 29c8d7f to 4b4f995 Compare March 5, 2026 08:39

charlesvien force-pushed the 03-04-syntax_highlighting branch from 4b4f995 to 7075527 Compare March 5, 2026 08:53

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch 2 times, most recently from 213e7bf to 6dcb2f9 Compare March 5, 2026 09:09

charlesvien force-pushed the 03-04-syntax_highlighting branch from 7075527 to 0558c25 Compare March 5, 2026 09:09

charlesvien force-pushed the 03-04-suppress_prompt-complete_notification_when_messages_are_queued branch 4 times, most recently from 8781ad8 to 4057594 Compare March 5, 2026 09:24

graphite-app bot changed the base branch from 03-04-suppress_prompt-complete_notification_when_messages_are_queued to graphite-base/1119 March 5, 2026 09:27

charlesvien force-pushed the graphite-base/1119 branch from 4057594 to b0f4faa Compare March 5, 2026 09:29

charlesvien force-pushed the 03-04-syntax_highlighting branch from 0558c25 to 229cdc4 Compare March 5, 2026 09:29

charlesvien changed the base branch from graphite-base/1119 to 03-04-suppress_prompt-complete_notification_when_messages_are_queued March 5, 2026 09:29

Base automatically changed from 03-04-suppress_prompt-complete_notification_when_messages_are_queued to main March 5, 2026 09:32

charlesvien added 2 commits March 5, 2026 09:32

Add syntax highlighting to agent message code blocks

2de0f1a

Add @lezer/common and @lezer/highlight as explicit dependencies

ae2c8e9

charlesvien force-pushed the 03-04-syntax_highlighting branch from 229cdc4 to ae2c8e9 Compare March 5, 2026 09:32

charlesvien merged commit fc98bb0 into main Mar 5, 2026
13 checks passed

charlesvien deleted the 03-04-syntax_highlighting branch March 5, 2026 09:35

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feat: Add syntax highlighting to agent message code blocks#1119

feat: Add syntax highlighting to agent message code blocks#1119
charlesvien merged 2 commits intomainfrom
03-04-syntax_highlighting

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charlesvien commented Mar 4, 2026 •

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charlesvien commented Mar 4, 2026 •

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charlesvien commented Mar 5, 2026 •

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