Initial commit

quartz/util/log.ts

@@ -0,0 +1,58 @@
+import truncate from "ansi-truncate"
+import readline from "readline"
+
+export class QuartzLogger {
+  verbose: boolean
+  private spinnerInterval: NodeJS.Timeout | undefined
+  private spinnerText: string = ""
+  private updateSuffix: string = ""
+  private spinnerIndex: number = 0
+  private readonly spinnerChars = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"]
+
+  constructor(verbose: boolean) {
+    const isInteractiveTerminal =
+      process.stdout.isTTY && process.env.TERM !== "dumb" && !process.env.CI
+    this.verbose = verbose || !isInteractiveTerminal
+  }
+
+  start(text: string) {
+    this.spinnerText = text
+
+    if (this.verbose) {
+      console.log(text)
+    } else {
+      this.spinnerIndex = 0
+      this.spinnerInterval = setInterval(() => {
+        readline.clearLine(process.stdout, 0)
+        readline.cursorTo(process.stdout, 0)
+
+        const columns = process.stdout.columns || 80
+        let output = `${this.spinnerChars[this.spinnerIndex]} ${this.spinnerText}`
+        if (this.updateSuffix) {
+          output += `: ${this.updateSuffix}`
+        }
+
+        const truncated = truncate(output, columns)
+        process.stdout.write(truncated)
+        this.spinnerIndex = (this.spinnerIndex + 1) % this.spinnerChars.length
+      }, 50)
+    }
+  }
+
+  updateText(text: string) {
+    this.updateSuffix = text
+  }
+
+  end(text?: string) {
+    if (!this.verbose && this.spinnerInterval) {
+      clearInterval(this.spinnerInterval)
+      this.spinnerInterval = undefined
+      readline.clearLine(process.stdout, 0)
+      readline.cursorTo(process.stdout, 0)
+    }
+
+    if (text) {
+      console.log(text)
+    }
+  }
+}