surshar / claude-code

Claude Code is an agentic coding tool that lives in your terminal, understands your codebase, and helps you code faster by executing routine tasks, explaining complex code, and handling git workflows - all through natural language commands.

Built by Anthropic · github.com/anthropics

mods/diff: an asked diff is cut to the room the prompt's context has left, and dropped with a status when none is leftBrowse files

poteat authored on Sep 10, 2026 parent d920522 · commit 1c97c29b184b

6 changed files+79 -8compared with d920522

Amods/diff/hooks/ask/ask-cut-note.ts

Amods/diff/hooks/ask/fitted-ask-text-of.ts

Mmods/diff/hooks/ask/index.ts

Mmods/diff/hooks/limits/sizes/index.ts

Amods/diff/hooks/limits/sizes/prompt-context-max-chars.ts

Mmods/diff/hooks/register.ts

Amods/diff/hooks/ask/ask-cut-note.ts+5 -0

		@@ -1,0 +1,5 @@
	1	+/**
	2	+ * The line an ask ends with when its diff was cut to fit the prompt.
	3	+ */
	4	+export const ASK_CUT_NOTE =
	5	+ '(The rest of this diff was cut: it did not fit in the prompt.)'

Amods/diff/hooks/ask/fitted-ask-text-of.ts+33 -0

		@@ -1,0 +1,33 @@
	1	+import { ASK_CUT_NOTE } from './ask-cut-note.js'
	2	+
	3	+/**
	4	+ * An armed ask's text as it fits in the room a prompt's context has left:
	5	+ * whole when it fits, else its first lines and ASK_CUT_NOTE.
	6	+ *
	7	+ * @param text the armed ask's text
	8	+ * @param room the characters the context has left
	9	+ * @returns the text to attach, or undefined when not even its first line fits
	10	+ */
	11	+export function fittedAskTextOf(text: string, room: number): string \| undefined {
	12	+ if (text.length <= room) {
	13	+ return text
	14	+ }
	15	+
	16	+ const kept: string[] = []
	17	+ let used = ASK_CUT_NOTE.length
	18	+
	19	+ for (const line of text.split('\n')) {
	20	+ const cost = line.length + 1
	21	+
	22	+ if (used + cost > room) {
	23	+ break
	24	+ }
	25	+
	26	+ kept.push(line)
	27	+ used += cost
	28	+ }
	29	+
	30	+ const hasBody = kept.length > 1
	31	+
	32	+ return hasBody ? `${kept.join('\n')}\n${ASK_CUT_NOTE}` : undefined
	33	+}

Mmods/diff/hooks/ask/index.ts+2 -0

		@@ -1,4 +1,6 @@
1	1	export * from './armed-ask'
2	2	export * from './armed-ask-of.js'
	3	+export * from './ask-cut-note.js'
	4	+export * from './fitted-ask-text-of.js'
3	5
4	6	export * as default from '.'

Mmods/diff/hooks/limits/sizes/index.ts+1 -0

		@@ -6,5 +6,6 @@
6	6	export * from './max-listed-directories.js'
7	7	export * from './max-untracked-probes.js'
8	8	export * from './pane-top-pad-rows.js'
	9	+export * from './prompt-context-max-chars.js'
9	10
10	11	export * as default from '.'

Amods/diff/hooks/limits/sizes/prompt-context-max-chars.ts+5 -0

		@@ -1,0 +1,5 @@
	1	+/**
	2	+ * The most characters a prompt's context carries, its entries together; the
	3	+ * engine refuses a context past it, so an ask is fitted to what is left.
	4	+ */
	5	+export const PROMPT_CONTEXT_MAX_CHARS = 32_000

Mmods/diff/hooks/register.ts+33 -8

		@@ -40,6 +40,7 @@
40	40	let hasShownOnce = false
41	41	let wasDrawnSinceProbe = false
42	42	let armed: Ask.ArmedAsk \| null = null
	43	+ let carrying: Ask.ArmedAsk \| null = null
43	44	let isRefreshing = false
44	45	let isRefreshQueued = false
45	46	let generation = 0
		@@ -592,21 +593,45 @@
592	593	on('prompt.submit', async ($, e, next) => {
593	594	const asked = armed
594	595
595		- if (!host \|\| !asked) {
	596	+ if (!host \|\| !asked \|\| carrying === asked) {
596	597	return next(e)
597	598	}
598	599
599		- const result = await next({
600		- ...e,
601		- context: [...(e.context ?? []), asked.text],
602		- })
	600	+ const context = e.context ?? []
	601	+ const used = context.reduce((sum, entry) => sum + entry.length, 0)
	602	+ const text = Ask.fittedAskTextOf(
	603	+ asked.text,
	604	+ Limits.PROMPT_CONTEXT_MAX_CHARS - used,
	605	+ )
603	606
604		- if (result.drop === undefined && armed === asked) {
	607	+ if (text === undefined) {
605	608	disarm(host)
	609	+ host.status(
	610	+ `${Views.sanitizeName(asked.path)}'s diff did not fit in the prompt ` +
	611	+ `and was dropped`,
	612	+ )
606	613	redraw(host)
607		- Record.recorderOf(host).asked(asked.lines)
	614	+
	615	+ return next(e)
608	616	}
609	617
610		- return result
	618	+ carrying = asked
	619	+
	620	+ try {
	621	+ const result = await next({ ...e, context: [...context, text] })
	622	+
	623	+ if (result.drop === undefined) {
	624	+ Record.recorderOf(host).asked(asked.lines)
	625	+
	626	+ if (armed === asked) {
	627	+ disarm(host)
	628	+ redraw(host)
	629	+ }
	630	+ }
	631	+
	632	+ return result
	633	+ } finally {
	634	+ carrying = null
	635	+ }
611	636	})
612	637	}