handle edge cases

src/makePatch.ts

@@ -40,6 +40,7 @@ import {
   PatchState,
   savePatchApplicationState,
   STATE_FILE_NAME,
+  verifyAppliedPatches,
 } from "./stateFile"
 
 function printNoPackageFoundError(
@@ -92,8 +93,10 @@ export function makePatch({
     mode = { type: "append", name: "initial" }
   }
 
-  // TODO: verify applied patch hashes
-  // TODO: handle case where rebase appending and the name is the same as the next one in the sequence
+  if (isRebasing && state) {
+    verifyAppliedPatches({ appPath, patchDir, state })
+  }
+
   if (
     mode.type === "overwrite_last" &&
     isRebasing &&
@@ -424,12 +427,8 @@ export function makePatch({
       // scoped package
       mkdirSync(dirname(patchPath))
     }
-    writeFileSync(patchPath, diffResult.stdout)
-    console.log(
-      `${chalk.green("✔")} Created file ${join(patchDir, patchFileName)}\n`,
-    )
 
-    // if we inserted a new patch into a sequence we may need to update the sequence numbers
+    // if we are inserting a new patch into a sequence we most likely need to update the sequence numbers
     if (isRebasing && mode.type === "append") {
       const patchesToNudge = existingPatches.slice(state!.patches.length)
       if (sequenceNumber === undefined) {
@@ -460,6 +459,11 @@ export function makePatch({
       }
     }
 
+    writeFileSync(patchPath, diffResult.stdout)
+    console.log(
+      `${chalk.green("✔")} Created file ${join(patchDir, patchFileName)}\n`,
+    )
+
     const prevState: PatchState[] = patchesToApplyBeforeDiffing.map(
       (p): PatchState => ({
         patchFilename: p.patchFilename,

src/rebase.ts

@@ -1,5 +1,4 @@
 import chalk from "chalk"
-import { existsSync } from "fs"
 import { join, resolve } from "path"
 import { applyPatch } from "./applyPatches"
 import { hashFile } from "./hash"
@@ -8,6 +7,7 @@ import { getGroupedPatches } from "./patchFs"
 import {
   getPatchApplicationState,
   savePatchApplicationState,
+  verifyAppliedPatches,
 } from "./stateFile"
 
 export function rebase({
@@ -76,28 +76,7 @@ export function rebase({
     )
   }
   // check hashes
-  for (let i = 0; i < state.patches.length; i++) {
-    const patch = state.patches[i]
-    const fullPatchPath = join(
-      patchesDirectory,
-      packagePatches[i].patchFilename,
-    )
-    if (!existsSync(fullPatchPath)) {
-      console.log(
-        chalk.blueBright("Expected patch file"),
-        fullPatchPath,
-        "to exist but it is missing. Try completely reinstalling node_modules first.",
-      )
-      process.exit(1)
-    }
-    if (patch.patchContentHash !== hashFile(fullPatchPath)) {
-      console.log(
-        chalk.blueBright("Patch file"),
-        fullPatchPath,
-        "has changed since it was applied. Try completely reinstalling node_modules first.",
-      )
-    }
-  }
+  verifyAppliedPatches({ appPath, patchDir, state })
 
   if (targetPatch === "0") {
     // unapply all

src/stateFile.ts

@@ -1,7 +1,9 @@
-import { readFileSync, unlinkSync, writeFileSync } from "fs"
+import { existsSync, readFileSync, unlinkSync, writeFileSync } from "fs"
 import { join } from "path"
 import { PackageDetails } from "./PackageDetails"
 import stringify from "json-stable-stringify"
+import { hashFile } from "./hash"
+import chalk from "chalk"
 export interface PatchState {
   patchFilename: string
   patchContentHash: string
@@ -69,3 +71,37 @@ export function clearPatchApplicationState(packageDetails: PackageDetails) {
     // noop
   }
 }
+
+export function verifyAppliedPatches({
+  appPath,
+  patchDir,
+  state,
+}: {
+  appPath: string
+  patchDir: string
+  state: PatchApplicationState
+}) {
+  const patchesDirectory = join(appPath, patchDir)
+  for (const patch of state.patches) {
+    if (!patch.didApply) {
+      break
+    }
+    const fullPatchPath = join(patchesDirectory, patch.patchFilename)
+    if (!existsSync(fullPatchPath)) {
+      console.log(
+        chalk.blueBright("Expected patch file"),
+        fullPatchPath,
+        "to exist but it is missing. Try removing and reinstalling node_modules first.",
+      )
+      process.exit(1)
+    }
+    if (patch.patchContentHash !== hashFile(fullPatchPath)) {
+      console.log(
+        chalk.blueBright("Patch file"),
+        fullPatchPath,
+        "has changed since it was applied. Try removing and reinstalling node_modules first.",
+      )
+      process.exit(1)
+    }
+  }
+}