schpet__linear-cli/test/utils/pager.test.ts

import { assertEquals } from "@std/assert"
import { getPagerCommand, shouldUsePager } from "../../src/utils/pager.ts"

Deno.test({
  name: "shouldUsePager - returns false when usePager is false",
  fn() {
    const outputLines = Array.from({ length: 100 }, (_, i) => `Line ${i + 1}`)
    assertEquals(shouldUsePager(outputLines, false), false)
  },
})

Deno.test({
  name: "shouldUsePager - returns false when not in terminal",
  fn() {
    // Mock stdout.isTerminal to return false
    const originalIsTerminal = Deno.stdout.isTerminal
    Deno.stdout.isTerminal = () => false

    try {
      const outputLines = Array.from(
        { length: 100 },
        (_, i) => `Line ${i + 1}`,
      )
      assertEquals(shouldUsePager(outputLines, true), false)
    } finally {
      Deno.stdout.isTerminal = originalIsTerminal
    }
  },
})

Deno.test({
  name:
    "shouldUsePager - returns true when content is long and conditions are met",
  fn() {
    // Mock stdout.isTerminal to return true
    const originalIsTerminal = Deno.stdout.isTerminal
    Deno.stdout.isTerminal = () => true

    // Mock consoleSize to return a small terminal
    const originalConsoleSize = Deno.consoleSize
    Deno.consoleSize = () => ({ columns: 80, rows: 10 })

    try {
      // Create output longer than terminal height (10 - 2 = 8)
      const outputLines = Array.from({ length: 20 }, (_, i) => `Line ${i + 1}`)
      assertEquals(shouldUsePager(outputLines, true), true)
    } finally {
      Deno.stdout.isTerminal = originalIsTerminal
      Deno.consoleSize = originalConsoleSize
    }
  },
})

Deno.test({
  name: "shouldUsePager - returns false when content is short",
  fn() {
    // Mock stdout.isTerminal to return true
    const originalIsTerminal = Deno.stdout.isTerminal
    Deno.stdout.isTerminal = () => true

    // Mock consoleSize to return a large terminal
    const originalConsoleSize = Deno.consoleSize
    Deno.consoleSize = () => ({ columns: 80, rows: 50 })

    try {
      // Create output shorter than terminal height (50 - 2 = 48)
      const outputLines = Array.from({ length: 10 }, (_, i) => `Line ${i + 1}`)
      assertEquals(shouldUsePager(outputLines, true), false)
    } finally {
      Deno.stdout.isTerminal = originalIsTerminal
      Deno.consoleSize = originalConsoleSize
    }
  },
})

Deno.test({
  name: "getPagerCommand - includes -X flag for less on unix systems",
  fn() {
    // Clear PAGER environment variable to test default behavior
    const originalPager = Deno.env.get("PAGER")
    if (originalPager) Deno.env.delete("PAGER")

    try {
      const pagerConfig = getPagerCommand()
      if (Deno.build.os !== "windows") {
        assertEquals(pagerConfig?.command, "less")
        assertEquals(pagerConfig?.args, ["-R", "-X"])
      }
    } finally {
      // Restore original PAGER if it existed
      if (originalPager) Deno.env.set("PAGER", originalPager)
    }
  },
})