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extensions/Excel转JSON/node_modules/atomically/src/utils/temp.ts

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+
+/* IMPORT */
+
+import * as path from 'path';
+import {LIMIT_BASENAME_LENGTH} from '../consts';
+import {Disposer} from '../types';
+import FS from './fs';
+
+/* TEMP */
+
+//TODO: Maybe publish this as a standalone package
+
+const Temp = {
+
+  store: <Record<string, boolean>> {}, // filePath => purge
+
+  create: ( filePath: string ): string => {
+
+    const randomness = `000000${Math.floor ( Math.random () * 16777215 ).toString ( 16 )}`.slice ( -6 ), // 6 random-enough hex characters
+          timestamp = Date.now ().toString ().slice ( -10 ), // 10 precise timestamp digits
+          prefix = 'tmp-',
+          suffix = `.${prefix}${timestamp}${randomness}`,
+          tempPath = `${filePath}${suffix}`;
+
+    return tempPath;
+
+  },
+
+  get: ( filePath: string, creator: ( filePath: string ) => string, purge: boolean = true ): [string, Disposer] => {
+
+    const tempPath = Temp.truncate ( creator ( filePath ) );
+
+    if ( tempPath in Temp.store ) return Temp.get ( filePath, creator, purge ); // Collision found, try again
+
+    Temp.store[tempPath] = purge;
+
+    const disposer = () => delete Temp.store[tempPath];
+
+    return [tempPath, disposer];
+
+  },
+
+  purge: ( filePath: string ): void => {
+
+    if ( !Temp.store[filePath] ) return;
+
+    delete Temp.store[filePath];
+
+    FS.unlinkAttempt ( filePath );
+
+  },
+
+  purgeSync: ( filePath: string ): void => {
+
+    if ( !Temp.store[filePath] ) return;
+
+    delete Temp.store[filePath];
+
+    FS.unlinkSyncAttempt ( filePath );
+
+  },
+
+  purgeSyncAll: (): void => {
+
+    for ( const filePath in Temp.store ) {
+
+      Temp.purgeSync ( filePath );
+
+    }
+
+  },
+
+  truncate: ( filePath: string ): string => { // Truncating paths to avoid getting an "ENAMETOOLONG" error //FIXME: This doesn't really always work, the actual filesystem limits must be detected for this to be implemented correctly
+
+    const basename = path.basename ( filePath );
+
+    if ( basename.length <= LIMIT_BASENAME_LENGTH ) return filePath; //FIXME: Rough and quick attempt at detecting ok lengths
+
+    const truncable = /^(\.?)(.*?)((?:\.[^.]+)?(?:\.tmp-\d{10}[a-f0-9]{6})?)$/.exec ( basename );
+
+    if ( !truncable ) return filePath; //FIXME: No truncable part detected, can't really do much without also changing the parent path, which is unsafe, hoping for the best here
+
+    const truncationLength = basename.length - LIMIT_BASENAME_LENGTH;
+
+    return `${filePath.slice ( 0, - basename.length )}${truncable[1]}${truncable[2].slice ( 0, - truncationLength )}${truncable[3]}`; //FIXME: The truncable part might be shorter than needed here
+
+  }
+
+};
+
+/* INIT */
+
+process.on ( 'exit', Temp.purgeSyncAll ); // Ensuring purgeable temp files are purged on exit
+
+/* EXPORT */
+
+export default Temp;