bd9a8d9788
Adds repo-wide git changes view with refresh controls and keeps right drawer shortcuts fixed while tabs scroll.
87 lines
2.7 KiB
TypeScript
87 lines
2.7 KiB
TypeScript
import { applyPatch, parsePatch } from "diff"
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type ParsedPatchIndex = ReturnType<typeof parsePatch>[number]
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type ParsedHunk = ParsedPatchIndex["hunks"][number]
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type SdkPatch = {
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oldFileName: string
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newFileName: string
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oldHeader?: string
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newHeader?: string
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hunks: Array<{
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oldStart: number
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oldLines: number
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newStart: number
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newLines: number
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lines: Array<string>
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}>
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index?: string
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}
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function invertPatchLine(line: string): string {
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if (!line) return line
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const op = line[0]
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if (op === "+") return `-${line.slice(1)}`
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if (op === "-") return `+${line.slice(1)}`
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return line
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}
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function reverseParsedHunk(hunk: ParsedHunk): ParsedHunk {
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return {
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oldStart: hunk.newStart,
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oldLines: hunk.newLines,
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newStart: hunk.oldStart,
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newLines: hunk.oldLines,
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lines: hunk.lines.map(invertPatchLine),
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linedelimiters: Array.isArray((hunk as any).linedelimiters) ? (hunk as any).linedelimiters : [],
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} as ParsedHunk
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}
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function reverseParsedIndex(index: ParsedPatchIndex): ParsedPatchIndex {
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const hunks = Array.isArray(index.hunks) ? index.hunks : []
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return {
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...index,
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oldFileName: (index as any).newFileName,
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newFileName: (index as any).oldFileName,
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oldHeader: (index as any).newHeader,
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newHeader: (index as any).oldHeader,
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hunks: hunks.map(reverseParsedHunk),
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} as ParsedPatchIndex
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}
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export function buildUnifiedDiffFromSdkPatch(patch: SdkPatch): string {
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const oldName = patch.oldFileName || "a/file"
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const newName = patch.newFileName || "b/file"
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const oldHeader = patch.oldHeader ? `\t${patch.oldHeader}` : ""
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const newHeader = patch.newHeader ? `\t${patch.newHeader}` : ""
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const lines: string[] = []
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if (patch.index) {
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// jsdiff can parse arbitrary metadata lines before file headers.
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lines.push(`Index: ${patch.index}`)
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}
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lines.push(`--- ${oldName}${oldHeader}`)
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lines.push(`+++ ${newName}${newHeader}`)
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for (const hunk of patch.hunks || []) {
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const oldRange = hunk.oldLines === 1 ? `${hunk.oldStart}` : `${hunk.oldStart},${hunk.oldLines}`
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const newRange = hunk.newLines === 1 ? `${hunk.newStart}` : `${hunk.newStart},${hunk.newLines}`
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lines.push(`@@ -${oldRange} +${newRange} @@`)
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for (const line of hunk.lines || []) {
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lines.push(line)
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}
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}
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return `${lines.join("\n")}\n`
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}
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export function tryReverseApplyUnifiedDiff(afterText: string, diffText: string): string | null {
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const normalized = (diffText ?? "").trim()
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if (!normalized) return null
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const parsed = parsePatch(diffText)
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if (!Array.isArray(parsed) || parsed.length === 0) return null
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const reversed = reverseParsedIndex(parsed[0])
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const result = applyPatch(afterText ?? "", reversed)
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return typeof result === "string" ? result : null
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}
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