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packPNG v1.8c - smart console-detection prompt

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@YadeWira YadeWira released this 05 May 17:40
· 7 commits to master since this release
v1.8c
a6ff3bf

v1.8c - smart console detection: only prompt on a fresh console

Third bugfix on the v1.8 line. v1.8a fixed the double-click console-close
problem by always printing "Press to quit" on every help / error
exit. Real-world feedback: that was correct for double-click but noisy
in every other context -- running from cmd.exe, PowerShell, Windows
Terminal, SSH, or a .bat would also show the prompt, even though the
console is shared with a parent shell that survives our exit.

The fix

Detect whether the console is fresh (only packPNG attached, will
close on our exit) before showing the prompt. On Windows, this is
GetConsoleProcessList(buf, 2) returning 1. On Linux, terminal
emulators outlive us in every realistic case, so it always returns
false -- the prompt was always noise on Linux and v1.8c retires it
there too.

Invocation console_is_fresh prompt?
Windows: double-click .exe directly yes (1 proc) yes
Windows: from cmd.exe / PowerShell / Windows Terminal no (2+ procs) no
Windows: from a .bat file no (cmd is parent) no
Windows: from SSH no (sshd shell is ancestor) no
Linux: any context no (always) no

-np and -module continue to bypass the prompt unconditionally for
scripted / machine invocations, exactly as before.

Verified

On Windows 11 (DESKTOP-6R6L470, build 26200, PowerShell 5.1.26100) via
SSH:

Test 1  no-args from cmd        no prompt    PASS
Test 2  -mZ error from cmd      no prompt    PASS
Test 3  -np regression          no prompt    PASS

The fresh-console branch is verified manually by double-clicking the
.exe in Explorer and confirming "Press <enter> to quit" still
appears -- this is the path the bat selftest cannot reach (invoking a
.bat already establishes cmd.exe as parent, defeating the fresh
detection).

What didn't change

  • Wire format unchanged: .ppg files written by v1.8 / v1.8a /
    v1.8b decode under v1.8c and vice versa. Both TCIP (PNG/APNG) and
    TCIJ (JNG) magics are intact.
  • Compression algorithm unchanged: the tovyCIP backend
    (kanzi RLT+BWT+SRT+ZRLT/FPAQ + zstd-19 --long=27) is byte-exact
    identical to every prior release on the v1.8 line.
  • All v1.8a/b behaviours preserved apart from the prompt narrowing:
    the wait_and_return helper, exit-code handling for invalid magic
    (v1.8b), JNG support (v1.8), are all untouched.
  • Manifest assemblyIdentity@version bumped 1.8.0.2 -> 1.8.0.3.

Binaries

  • packPNG-linux-x86_64-v1.8c - Linux x86-64.
  • packPNG-windows-x86_64-full-v1.8c.exe - Windows x86-64, statically
    linked, mingw-w64 cross-compiled, UTF-8 active-code-page manifest.
  • test-v1.8c.bat - drop-next-to-the-exe selftest harness, 14 tests
    (regression set + flipped prompt expectations from v1.8a/b).

🤖 Generated with Claude Code

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