feat: make long list scrollable for interactive mode (#89)

Co-authored-by: Anthony Fu <anthonyfu117@hotmail.com>

src/commands/check/interactive.ts

@@ -7,7 +7,7 @@ import { createControlledPromise, notNullish } from '@antfu/utils'
 import type { CheckOptions, InteractiveContext, PackageMeta, ResolvedDepChange } from '../../types'
 import { getVersionOfRange, updateTargetVersion } from '../../io/resolves'
 import { getPrefixedVersion } from '../../utils/versions'
-import { FIG_BLOCK, FIG_NO_POINTER, FIG_POINTER, colorizeVersionDiff, formatTable } from '../../render'
+import { FIG_BLOCK, FIG_NO_POINTER, FIG_POINTER, colorizeVersionDiff, createSliceRender, formatTable } from '../../render'
 import { timeDifference } from '../../utils/time'
 import { renderChanges } from './render'
 
@@ -56,19 +56,18 @@ export async function promptInteractive(pkgs: PackageMeta[], options: CheckOptio
 
     return {
       render() {
+        const sr = createSliceRender()
         const Y = (v: string) => c.bold(c.green(v))
         console.clear()
-        console.log(`${FIG_BLOCK} ${c.gray(`${Y('↑↓')} to select, ${Y('space')} to toggle, ${Y('→')} to change version`)}`)
-        console.log(`${FIG_BLOCK} ${c.gray(`${Y('enter')} to confirm, ${Y('esc')} to cancel`)}`)
-        console.log()
-
-        const lines: string[] = []
+        sr.push({ content: `${FIG_BLOCK} ${c.gray(`${Y('↑↓')} to select, ${Y('space')} to toggle, ${Y('→')} to change version`)}`, fixed: true })
+        sr.push({ content: `${FIG_BLOCK} ${c.gray(`${Y('enter')} to confirm, ${Y('esc')} to cancel`)}`, fixed: true })
+        sr.push({ content: '', fixed: true })
 
         pkgs.forEach((pkg) => {
-          lines.push(...renderChanges(pkg, options, ctx).lines)
+          sr.push(...renderChanges(pkg, options, ctx).lines.map(x => ({ content: x })))
         })
 
-        console.log(lines.join('\n'))
+        sr.render(index)
       },
       onKey(key) {
         switch (key.name) {

src/render.ts

@@ -1,3 +1,5 @@
+/* eslint-disable no-console */
+import process from 'node:process'
 import c from 'picocolors'
 import { SemVer } from 'semver'
 import { getDiff } from './io/resolves'
@@ -110,3 +112,77 @@ export function colorizeVersionDiff(from: string, to: string, hightlightRange =
         + middot
         + c[color](partsToColor.slice(i).join('.')).trim()
 }
+
+interface SliceRenderLine {
+  content: string
+  fixed?: boolean
+}
+
+export function createSliceRender() {
+  const buffer: SliceRenderLine[] = []
+
+  return {
+    push(...lines: SliceRenderLine[]) {
+      buffer.push(...lines)
+    },
+    render(selectedDepIndex: number) {
+      let {
+        rows: remainHeight,
+        columns: availableWidth,
+      } = process.stdout
+
+      const lines: SliceRenderLine[] = buffer.length < remainHeight - 1
+        ? buffer
+        : [...buffer, { content: c.yellow('  -- END --') }]
+
+      // spare space for cursor
+      remainHeight -= 1
+      let i = 0
+      while (i < lines.length) {
+        const curr = lines[i]
+        if (curr.fixed) {
+          console.log(curr.content)
+          remainHeight -= 1
+          i++
+        }
+        else {
+          break
+        }
+      }
+
+      const remainLines = lines.slice(i)
+
+      // calculate focused line index from selected dep index
+      let focusedLineIndex = 0
+      let depIndex = 0
+      for (const line of remainLines) {
+        if (line.content.includes(FIG_CHECK))
+          depIndex += 1
+
+        if (depIndex === selectedDepIndex)
+          break
+        else
+          focusedLineIndex += 1
+      }
+
+      let slice: SliceRenderLine[]
+      if (
+        remainHeight < 1
+          || remainLines.length === 0
+          || remainLines.length <= remainHeight
+          || lines.some(x => Math.ceil(visualLength(x.content) / availableWidth) > 1)
+      ) {
+        slice = remainLines
+      }
+      else {
+        const half = Math.floor((remainHeight - 1) / 2)
+        const f = focusedLineIndex - half
+        const b = focusedLineIndex + remainHeight - half - remainLines.length
+        const start = Math.max(0, b <= 0 ? f : f - b)
+        slice = remainLines.slice(start, start + remainHeight)
+      }
+
+      console.log(slice.map(x => x.content).join('\n'))
+    },
+  }
+}