patch-package
Version:
When forking just won't work, patch it.
203 lines • 23.9 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var fs_extra_1 = __importDefault(require("fs-extra"));
var path_1 = require("path");
var assertNever_1 = require("../assertNever");
exports.executeEffects = function (effects, _a) {
var dryRun = _a.dryRun;
effects.forEach(function (eff) {
switch (eff.type) {
case "file deletion":
if (dryRun) {
if (!fs_extra_1.default.existsSync(eff.path)) {
throw new Error("Trying to delete file that doesn't exist: " + eff.path);
}
}
else {
// TODO: integrity checks
fs_extra_1.default.unlinkSync(eff.path);
}
break;
case "rename":
if (dryRun) {
// TODO: see what patch files look like if moving to exising path
if (!fs_extra_1.default.existsSync(eff.fromPath)) {
throw new Error("Trying to move file that doesn't exist: " + eff.fromPath);
}
}
else {
fs_extra_1.default.moveSync(eff.fromPath, eff.toPath);
}
break;
case "file creation":
if (dryRun) {
if (fs_extra_1.default.existsSync(eff.path)) {
throw new Error("Trying to create file that already exists: " + eff.path);
}
// todo: check file contents matches
}
else {
var fileContents = eff.hunk
? eff.hunk.parts[0].lines.join("\n") +
(eff.hunk.parts[0].noNewlineAtEndOfFile ? "" : "\n")
: "";
fs_extra_1.default.ensureDirSync(path_1.dirname(eff.path));
fs_extra_1.default.writeFileSync(eff.path, fileContents, { mode: eff.mode });
}
break;
case "patch":
applyPatch(eff, { dryRun: dryRun });
break;
case "mode change":
var currentMode = fs_extra_1.default.statSync(eff.path).mode;
if ((isExecutable(eff.newMode) && isExecutable(currentMode)) ||
(!isExecutable(eff.newMode) && !isExecutable(currentMode))) {
throw new Error("Mode change is not required");
}
fs_extra_1.default.chmodSync(eff.path, eff.newMode);
break;
default:
assertNever_1.assertNever(eff);
}
});
};
function isExecutable(fileMode) {
// tslint:disable-next-line:no-bitwise
return (fileMode & 64) > 0;
}
var trimRight = function (s) { return s.replace(/\s+$/, ""); };
function linesAreEqual(a, b) {
return trimRight(a) === trimRight(b);
}
/**
* How does noNewLineAtEndOfFile work?
*
* if you remove the newline from a file that had one without editing other bits:
*
* it creates an insertion/removal pair where the insertion has \ No new line at end of file
*
* if you edit a file that didn't have a new line and don't add one:
*
* both insertion and deletion have \ No new line at end of file
*
* if you edit a file that didn't have a new line and add one:
*
* deletion has \ No new line at end of file
* but not insertion
*
* if you edit a file that had a new line and leave it in:
*
* neither insetion nor deletion have the annoation
*
*/
function applyPatch(_a, _b) {
var hunks = _a.hunks, path = _a.path;
var dryRun = _b.dryRun;
// modifying the file in place
var fileContents = fs_extra_1.default.readFileSync(path).toString();
var mode = fs_extra_1.default.statSync(path).mode;
var fileLines = fileContents.split(/\n/);
var result = [];
for (var _i = 0, hunks_1 = hunks; _i < hunks_1.length; _i++) {
var hunk = hunks_1[_i];
var fuzzingOffset = 0;
while (true) {
var modifications = evaluateHunk(hunk, fileLines, fuzzingOffset);
if (modifications) {
result.push(modifications);
break;
}
fuzzingOffset =
fuzzingOffset < 0 ? fuzzingOffset * -1 : fuzzingOffset * -1 - 1;
if (Math.abs(fuzzingOffset) > 20) {
throw new Error("Cant apply hunk " + hunks.indexOf(hunk) + " for file " + path);
}
}
}
if (dryRun) {
return;
}
var diffOffset = 0;
for (var _c = 0, result_1 = result; _c < result_1.length; _c++) {
var modifications = result_1[_c];
for (var _d = 0, modifications_1 = modifications; _d < modifications_1.length; _d++) {
var modification = modifications_1[_d];
switch (modification.type) {
case "splice":
fileLines.splice.apply(fileLines, [modification.index + diffOffset,
modification.numToDelete].concat(modification.linesToInsert));
diffOffset +=
modification.linesToInsert.length - modification.numToDelete;
break;
case "pop":
fileLines.pop();
break;
case "push":
fileLines.push(modification.line);
break;
default:
assertNever_1.assertNever(modification);
}
}
}
fs_extra_1.default.writeFileSync(path, fileLines.join("\n"), { mode: mode });
}
function evaluateHunk(hunk, fileLines, fuzzingOffset) {
var result = [];
var contextIndex = hunk.header.original.start - 1 + fuzzingOffset;
// do bounds checks for index
if (contextIndex < 0) {
return null;
}
if (fileLines.length - contextIndex < hunk.header.original.length) {
return null;
}
for (var _i = 0, _a = hunk.parts; _i < _a.length; _i++) {
var part = _a[_i];
switch (part.type) {
case "deletion":
case "context":
for (var _b = 0, _c = part.lines; _b < _c.length; _b++) {
var line = _c[_b];
var originalLine = fileLines[contextIndex];
if (!linesAreEqual(originalLine, line)) {
return null;
}
contextIndex++;
}
if (part.type === "deletion") {
result.push({
type: "splice",
index: contextIndex - part.lines.length,
numToDelete: part.lines.length,
linesToInsert: [],
});
if (part.noNewlineAtEndOfFile) {
result.push({
type: "push",
line: "",
});
}
}
break;
case "insertion":
result.push({
type: "splice",
index: contextIndex,
numToDelete: 0,
linesToInsert: part.lines,
});
if (part.noNewlineAtEndOfFile) {
result.push({ type: "pop" });
}
break;
default:
assertNever_1.assertNever(part.type);
}
}
return result;
}
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fs from \"fs-extra\"\nimport { dirname } from \"path\"\nimport { ParsedPatchFile, FilePatch, Hunk } from \"./parse\"\nimport { assertNever } from \"../assertNever\"\n\nexport const executeEffects = (\n  effects: ParsedPatchFile,\n  { dryRun }: { dryRun: boolean },\n) => {\n  effects.forEach(eff => {\n    switch (eff.type) {\n      case \"file deletion\":\n        if (dryRun) {\n          if (!fs.existsSync(eff.path)) {\n            throw new Error(\n              \"Trying to delete file that doesn't exist: \" + eff.path,\n            )\n          }\n        } else {\n          // TODO: integrity checks\n          fs.unlinkSync(eff.path)\n        }\n        break\n      case \"rename\":\n        if (dryRun) {\n          // TODO: see what patch files look like if moving to exising path\n          if (!fs.existsSync(eff.fromPath)) {\n            throw new Error(\n              \"Trying to move file that doesn't exist: \" + eff.fromPath,\n            )\n          }\n        } else {\n          fs.moveSync(eff.fromPath, eff.toPath)\n        }\n        break\n      case \"file creation\":\n        if (dryRun) {\n          if (fs.existsSync(eff.path)) {\n            throw new Error(\n              \"Trying to create file that already exists: \" + eff.path,\n            )\n          }\n          // todo: check file contents matches\n        } else {\n          const fileContents = eff.hunk\n            ? eff.hunk.parts[0].lines.join(\"\\n\") +\n              (eff.hunk.parts[0].noNewlineAtEndOfFile ? \"\" : \"\\n\")\n            : \"\"\n          fs.ensureDirSync(dirname(eff.path))\n          fs.writeFileSync(eff.path, fileContents, { mode: eff.mode })\n        }\n        break\n      case \"patch\":\n        applyPatch(eff, { dryRun })\n        break\n      case \"mode change\":\n        const currentMode = fs.statSync(eff.path).mode\n        if (\n          (isExecutable(eff.newMode) && isExecutable(currentMode)) ||\n          (!isExecutable(eff.newMode) && !isExecutable(currentMode))\n        ) {\n          throw new Error(\"Mode change is not required\")\n        }\n        fs.chmodSync(eff.path, eff.newMode)\n        break\n      default:\n        assertNever(eff)\n    }\n  })\n}\n\nfunction isExecutable(fileMode: number) {\n  // tslint:disable-next-line:no-bitwise\n  return (fileMode & 0b001_000_000) > 0\n}\n\nconst trimRight = (s: string) => s.replace(/\\s+$/, \"\")\nfunction linesAreEqual(a: string, b: string) {\n  return trimRight(a) === trimRight(b)\n}\n\n/**\n * How does noNewLineAtEndOfFile work?\n *\n * if you remove the newline from a file that had one without editing other bits:\n *\n *    it creates an insertion/removal pair where the insertion has \\ No new line at end of file\n *\n * if you edit a file that didn't have a new line and don't add one:\n *\n *    both insertion and deletion have \\ No new line at end of file\n *\n * if you edit a file that didn't have a new line and add one:\n *\n *    deletion has \\ No new line at end of file\n *    but not insertion\n *\n * if you edit a file that had a new line and leave it in:\n *\n *    neither insetion nor deletion have the annoation\n *\n */\n\nfunction applyPatch(\n  { hunks, path }: FilePatch,\n  { dryRun }: { dryRun: boolean },\n): void {\n  // modifying the file in place\n  const fileContents = fs.readFileSync(path).toString()\n  const mode = fs.statSync(path).mode\n\n  const fileLines: string[] = fileContents.split(/\\n/)\n\n  const result: Modificaiton[][] = []\n\n  for (const hunk of hunks) {\n    let fuzzingOffset = 0\n    while (true) {\n      const modifications = evaluateHunk(hunk, fileLines, fuzzingOffset)\n      if (modifications) {\n        result.push(modifications)\n        break\n      }\n\n      fuzzingOffset =\n        fuzzingOffset < 0 ? fuzzingOffset * -1 : fuzzingOffset * -1 - 1\n\n      if (Math.abs(fuzzingOffset) > 20) {\n        throw new Error(\n          `Cant apply hunk ${hunks.indexOf(hunk)} for file ${path}`,\n        )\n      }\n    }\n  }\n\n  if (dryRun) {\n    return\n  }\n\n  let diffOffset = 0\n\n  for (const modifications of result) {\n    for (const modification of modifications) {\n      switch (modification.type) {\n        case \"splice\":\n          fileLines.splice(\n            modification.index + diffOffset,\n            modification.numToDelete,\n            ...modification.linesToInsert,\n          )\n          diffOffset +=\n            modification.linesToInsert.length - modification.numToDelete\n          break\n        case \"pop\":\n          fileLines.pop()\n          break\n        case \"push\":\n          fileLines.push(modification.line)\n          break\n        default:\n          assertNever(modification)\n      }\n    }\n  }\n\n  fs.writeFileSync(path, fileLines.join(\"\\n\"), { mode })\n}\n\ninterface Push {\n  type: \"push\"\n  line: string\n}\ninterface Pop {\n  type: \"pop\"\n}\ninterface Splice {\n  type: \"splice\"\n  index: number\n  numToDelete: number\n  linesToInsert: string[]\n}\n\ntype Modificaiton = Push | Pop | Splice\n\nfunction evaluateHunk(\n  hunk: Hunk,\n  fileLines: string[],\n  fuzzingOffset: number,\n): Modificaiton[] | null {\n  const result: Modificaiton[] = []\n  let contextIndex = hunk.header.original.start - 1 + fuzzingOffset\n  // do bounds checks for index\n  if (contextIndex < 0) {\n    return null\n  }\n  if (fileLines.length - contextIndex < hunk.header.original.length) {\n    return null\n  }\n\n  for (const part of hunk.parts) {\n    switch (part.type) {\n      case \"deletion\":\n      case \"context\":\n        for (const line of part.lines) {\n          const originalLine = fileLines[contextIndex]\n          if (!linesAreEqual(originalLine, line)) {\n            return null\n          }\n          contextIndex++\n        }\n\n        if (part.type === \"deletion\") {\n          result.push({\n            type: \"splice\",\n            index: contextIndex - part.lines.length,\n            numToDelete: part.lines.length,\n            linesToInsert: [],\n          })\n\n          if (part.noNewlineAtEndOfFile) {\n            result.push({\n              type: \"push\",\n              line: \"\",\n            })\n          }\n        }\n        break\n      case \"insertion\":\n        result.push({\n          type: \"splice\",\n          index: contextIndex,\n          numToDelete: 0,\n          linesToInsert: part.lines,\n        })\n        if (part.noNewlineAtEndOfFile) {\n          result.push({ type: \"pop\" })\n        }\n        break\n      default:\n        assertNever(part.type)\n    }\n  }\n\n  return result\n}\n"]}