wc command

Author: TarasMykytiuk

implement-shell-tools/wc/wc.js

@@ -0,0 +1,91 @@
+import process from "node:process";
+import { promises as fs } from "node:fs";
+
+const argv = process.argv.slice(2, process.argv.length);
+let flag = '';
+const paths = [];
+let dir = '';
+let ending = '';
+for (let i = 0; i < argv.length; i++) {
+    if (argv[i][0] == "-") {
+        flag = argv[i];
+    } else {
+        paths.push(argv[i]);
+    }
+}
+
+if (paths.length > 0) {
+    dir = paths[0].slice(0, paths[0].indexOf("/"));
+    ending = paths[0].slice(paths[0].indexOf("/") + 1);
+};
+
+const files = await resolveQuery(paths, dir, ending);
+await logFilesInfo(files, flag);
+
+async function resolveQuery(paths, dir, ending) {
+    let files = [];
+    if (paths.length > 1) {
+        files = await fs.readdir(dir);
+    } else {
+        files = [ending];
+    }
+    return files;
+}
+
+async function logFilesInfo(files, flag) {
+    let totalLines = 0;
+    let totalWords = 0;
+    let totalBytes = 0;
+    let totalOutput = '';
+    for (const fileName of files) {
+        let fileOutput = '';
+        let filePath = dir + "/" + fileName;
+        let file = await fs.readFile(filePath, "utf-8");
+        let linesNum = countLinesInString(file);
+        let wordsNum = countWordsInString(file);
+        let bytes = file.length;
+        totalLines += linesNum;
+        totalWords += wordsNum;
+        totalBytes += bytes;
+        if (flag == "-l") {
+            fileOutput = linesNum + " " + filePath;
+        } else if (flag == "-w") {
+            fileOutput = wordsNum + " " + filePath;
+        } else if (flag == '-c') {
+            fileOutput = bytes + " " + filePath;
+        } else {
+            fileOutput = linesNum + " " + wordsNum + " " + bytes + " " + filePath;
+        }
+        console.log(fileOutput);
+    }
+    if (files.length > 1) {
+        if (flag == "-l") {
+            totalOutput = totalLines + " total";
+        } else if (flag == "-w") {
+            totalOutput = totalWords + " total";
+        } else if (flag == '-c') {
+            totalOutput = totalBytes + " total";
+        } else {
+            totalOutput = totalLines + " " + totalWords + " " + totalBytes + " total";
+        }
+        console.log(totalOutput);
+    }
+}
+
+function countLinesInString(str) {
+    let lines = str.split('\n');
+    let linesNum = lines.length;
+    if (lines[lines.length - 1] == '') {
+        linesNum--;
+    }
+    return linesNum;
+}
+
+function countWordsInString(str) {
+    let words = str.replace(/\n/g, ' ').split(' ');
+    words = words.filter((word) => {
+        return (word != '')
+    });
+    let wordsNum = words.length;
+    return wordsNum;
+}