partial completions

Author: daviidy

app/InputHandler.js

@@ -24,20 +24,29 @@ class InputHandler {
                         this.inputBuffer = suggestions[0] + ' ';
                         this.readline.write(null, { ctrl: true, name: 'u' }); // Clear the current line
                         this.readline.write(this.inputBuffer);
+                        tabCounter = 0;
                     } else if (suggestions.length > 1) {
-                        if (tabCounter === 0) {
-                            // First <TAB> press: ring the bell
-                            process.stdout.write('\x07');
+                        const commonPrefix = this.getLongestCommonPrefix(suggestions);
+                        if (commonPrefix.length > this.inputBuffer.length) {
+                            this.inputBuffer = commonPrefix;
                             this.readline.write(null, { ctrl: true, name: 'u' });
                             this.readline.write(this.inputBuffer);
-                            tabCounter++;
-                        } else {
-                            // Second <TAB> press: display suggestions
-                            console.log('\n' + suggestions.join('  '));
-                            this.readline.write(null, { ctrl: true, name: 'u' });
-                            this.readline.prompt();
-                            this.readline.write(this.inputBuffer);
                             tabCounter = 0;
+                        } else {
+                            if (tabCounter === 0) {
+                                // First <TAB> press: ring the bell
+                                process.stdout.write('\x07');
+                                this.readline.write(null, { ctrl: true, name: 'u' });
+                                this.readline.write(this.inputBuffer);
+                                tabCounter++;
+                            } else {
+                                // Second <TAB> press: display suggestions
+                                console.log('\n' + suggestions.join('  '));
+                                this.readline.write(null, { ctrl: true, name: 'u' });
+                                this.readline.prompt();
+                                this.readline.write(this.inputBuffer);
+                                tabCounter = 0; // Reset the counter
+                            }
                         }
                     } else {
                         // No valid suggestions, ring the bell
@@ -60,6 +69,18 @@ class InputHandler {
         });
     }
 
+    getLongestCommonPrefix(suggestions) {
+        if (suggestions.length === 0) return '';
+        let prefix = suggestions[0];
+        for (let i = 1; i < suggestions.length; i++) {
+            while (!suggestions[i].startsWith(prefix)) {
+                prefix = prefix.slice(0, -1);
+                if (prefix === '') return '';
+            }
+        }
+        return prefix;
+    }
+
     isExecutable(stats) {
         return (stats.mode & 0o111) !== 0;
     }