"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.executeEffects = void 0;
const fs_extra_1 = __importDefault(require("fs-extra"));
const path_1 = require("path");
const assertNever_1 = require("../assertNever");
const executeEffects = (effects, { dryRun }) => {
    effects.forEach(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 {
                    const 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 });
                break;
            case "mode change":
                const currentMode = fs_extra_1.default.statSync(eff.path).mode;
                if (((isExecutable(eff.newMode) && isExecutable(currentMode)) ||
                    (!isExecutable(eff.newMode) && !isExecutable(currentMode))) &&
                    dryRun) {
                    console.warn(`Mode change is not required for file ${eff.path}`);
                }
                fs_extra_1.default.chmodSync(eff.path, eff.newMode);
                break;
            default:
                assertNever_1.assertNever(eff);
        }
    });
};
exports.executeEffects = executeEffects;
function isExecutable(fileMode) {
    // tslint:disable-next-line:no-bitwise
    return (fileMode & 64) > 0;
}
const trimRight = (s) => s.replace(/\s+$/, "");
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({ hunks, path }, { dryRun }) {
    // modifying the file in place
    const fileContents = fs_extra_1.default.readFileSync(path).toString();
    const mode = fs_extra_1.default.statSync(path).mode;
    const fileLines = fileContents.split(/\n/);
    const result = [];
    for (const hunk of hunks) {
        let fuzzingOffset = 0;
        while (true) {
            const 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;
    }
    let diffOffset = 0;
    for (const modifications of result) {
        for (const modification of modifications) {
            switch (modification.type) {
                case "splice":
                    fileLines.splice(modification.index + diffOffset, modification.numToDelete, ...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 });
}
function evaluateHunk(hunk, fileLines, fuzzingOffset) {
    const result = [];
    let 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 (const part of hunk.parts) {
        switch (part.type) {
            case "deletion":
            case "context":
                for (const line of part.lines) {
                    const 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          dryRun\n        ) {\n          console.warn(`Mode change is not required for file ${eff.path}`)\n        }\n        fs.chmodSync(eff.path, eff.newMode)\n        break\n      default:\n        assertNever(eff)\n    }\n  })\n}\n\nfunction isExecutable(fileMode: number) {\n  // tslint:disable-next-line:no-bitwise\n  return (fileMode & 0b001_000_000) > 0\n}\n\nconst trimRight = (s: string) => s.replace(/\\s+$/, \"\")\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"]}