fix: Windows Unicode encoding error in CLI help command (fixes #1543)#1545
fix: Windows Unicode encoding error in CLI help command (fixes #1543)#1545MervinPraison merged 2 commits intomainfrom
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- Detect Windows legacy encoding (CP1252, CP850, etc.) in Rich Console initialization - Create console with safe Windows options: legacy_windows=True, safe_box=True, emoji=False - Set PYTHONIOENCODING=utf-8 for subprocess safety - Add UnicodeEncodeError handling in Typer runner with helpful error message - Add ASCII fallback in print methods for encoding failures This ensures 'praisonai --help' works on Windows default terminals without crashing. Co-authored-by: praisonai-triage-agent[bot] <praisonai-triage-agent[bot]@users.noreply.github.com>
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📝 WalkthroughWalkthroughTwo files add Windows legacy code page detection and UTF-8 encoding enforcement with fallback error handling to prevent CLI crashes when rendering special characters on Windows terminals. Changes
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@copilot Do a thorough review of this PR. Read ALL existing reviewer comments above from Qodo, Coderabbit, and Gemini first — incorporate their findings. Review areas:
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Greptile SummaryThis PR guards the CLI against Confidence Score: 5/5Safe to merge; remaining findings are non-blocking style/edge-case improvements that don't affect the primary bug fix. All previously-flagged P1 issues are resolved: No files require special attention; Important Files Changed
Flowchart%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[praisonai --help] --> B{win32 platform?}
B -- No --> E[Console default]
B -- Yes --> C{Legacy code page?}
C -- "utf-8 / cp65001" --> E
C -- "cp1252 / cp850 / ascii" --> D["Console\nlegacy_windows=True\nsafe_box=True\nemoji=False"]
D --> F[app]
E --> F
F -- UnicodeEncodeError --> G[Print guidance\nsys.exit 0]
F -- ok --> H[Help displayed]
Reviews (2): Last reviewed commit: "fix: address critical encoding detection..." | Re-trigger Greptile |
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@claude You are the FINAL architecture reviewer. If the branch is under MervinPraison/PraisonAI (not a fork), you are able to make modifications to this branch and push directly. SCOPE: Focus ONLY on Python packages (praisonaiagents, praisonai). Do NOT modify praisonai-rust or praisonai-ts. Read ALL comments above from Gemini, Qodo, CodeRabbit, and Copilot carefully before responding. Phase 1: Review per AGENTS.md
Phase 2: FIX Valid Issues Phase 3: Final Verdict |
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Claude finished @MervinPraison's task —— View job Claude Code final architecture review: ✅ APPROVED Todo List
Phase 1: Architecture Review per AGENTS.md ✅Protocol-driven compliance: ✅ PASS
Backward compatibility: ✅ PASS
Performance: ✅ PASS
Phase 2: All Critical Issues Fixed ✅✅ P1 Issue: cp65001 encoding detection (lines 80, 50)
✅ P1 Issue: UnicodeEncodeError protection (9 locations)
✅ P2 Issues addressed:
Phase 3: Final Verdict ✅RECOMMENDATION: APPROVE & MERGE This PR successfully resolves the Windows Unicode encoding crash while maintaining:
All P1 blocking issues identified by reviewers have been resolved. The implementation is defensive, backward-compatible, and follows PraisonAI's engineering principles. Files Modified in Final Fix
Issue #1543 is ready to be closed upon merge. |
…ction issues - Fix overly broad 'cp' in encoding check to exclude cp65001 (Windows UTF-8 codepage) - Add UnicodeEncodeError protection to all print_* methods with emoji literals - Change --help exit code from 1 to 0 on encoding failure (conventional behavior) - Add fallback handling for Rich console failures in all output methods Resolves P1 issues identified by code reviewers while maintaining backward compatibility. Co-authored-by: Mervin Praison <MervinPraison@users.noreply.github.com>
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Actionable comments posted: 2
🧹 Nitpick comments (4)
src/praisonai/praisonai/cli/output/console.py (4)
43-44: Redundant local imports.
sysandosare already imported at the module top (lines 14-15); the local re-imports inside_get_console()are no-ops and can be removed.if _console is None and _get_rich_available(): from rich.console import Console - import sys - import os - # Detect Windows legacy encoding (CP1252) and use safe fallback🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/praisonai/praisonai/cli/output/console.py` around lines 43 - 44, Remove the redundant local imports of sys and os inside the _get_console() function: locate the _get_console() function and delete the inner "import sys" and "import os" lines since sys and os are already imported at module top; ensure no other local references rely on those inner imports and run tests/lint to confirm nothing else breaks.
184-188: ASCII fallback is reasonable, but consider stderr + encoding-aware replace.Two small refinements:
- If
messagecontains Rich markup (e.g."[bold red]…[/]"), the fallback will print the markup tags literally. Stripping markup before the fallback (rich.markup.strip_tags) keeps the degraded output clean.- Encode against
sys.stdout.encodingwitherrors='replace'rather than always ASCII, so terminals that can represent some non-ASCII (e.g. CP1252 Latin-1 supplement) still render those characters.- try: - self.console.print(message, style=style, **kwargs) - except UnicodeEncodeError: - # Fallback to plain text if Rich can't handle the encoding - print(message.encode('ascii', 'replace').decode('ascii')) + try: + self.console.print(message, style=style, **kwargs) + except UnicodeEncodeError: + enc = getattr(sys.stdout, 'encoding', 'ascii') or 'ascii' + try: + from rich.markup import render + plain = render(message).plain + except Exception: + plain = message + sys.stdout.write(plain.encode(enc, 'replace').decode(enc) + "\n")🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/praisonai/praisonai/cli/output/console.py` around lines 184 - 188, On UnicodeEncodeError in the console fallback (the try around self.console.print), strip Rich markup from message using rich.markup.strip_tags before printing and write to sys.stderr instead of stdout; when encoding, use sys.stdout.encoding (or fallback to 'utf-8') with errors='replace' rather than forcing ASCII so terminals that support extended encodings can still render characters—update the except block that catches UnicodeEncodeError to call rich.markup.strip_tags(message), encode using sys.stdout.encoding with errors='replace', decode back, and print to sys.stderr.
38-73: Scope gap: several other call sites bypass this safety net.
OutputController.print'sUnicodeEncodeErrorfallback and the safe-Console construction only protect output that flows throughOutputController. Per the provided cross-file context, these files write directly tosys.stdoutand would still raise on a CP1252 terminal:
src/praisonai/praisonai/cli/ui/rich_backend.py(lines ~60-80) —sys.stdout.write(content)for streaming chunks.src/praisonai/praisonai/cli/ui/plain.py(lines ~37-67) — directsys.stdout.write/flushfor message/tool events.src/praisonai/praisonai/cli/ui/mg_backend.py(lines ~256-265) — status-line writes.src/praisonai/praisonai/replay/player.py(lines ~53-65) — constructs its ownConsole()without the Windows-safe options.For the PR's stated goal (fixing
--help), these don't block, since Typer-rendered help goes through Rich. But once a user runs anything beyond--helpon a legacy Windows terminal (e.g., an agent run that streams tokens), the sameUnicodeEncodeErrorclass will reappear. Recommend either:
- Routing all console writes through
OutputController, or- Wrapping
sys.stdout/sys.stderrwithio.TextIOWrapper(..., errors='replace')once at startup for legacy Windows terminals (belt-and-braces).Option 2 is a one-liner and gives coverage for third-party code (LiteLLM, agent frameworks) as well:
if is_legacy_windows: sys.stdout.reconfigure(errors='replace') sys.stderr.reconfigure(errors='replace')🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/praisonai/praisonai/cli/output/console.py` around lines 38 - 73, Several direct writes to sys.stdout in functions like OutputController.print, rich_backend streaming, plain UI writers, mg_backend status writes, and replay.player's direct Console construction bypass the safe Console created by _get_console, so add a one-time fallback wrapper for legacy Windows terminals: detect legacy Windows encoding (same logic used in _get_console) at process startup and call sys.stdout.reconfigure(errors='replace') and sys.stderr.reconfigure(errors='replace') (or wrap with io.TextIOWrapper with errors='replace') so all direct writes (including those in rich_backend.py, plain.py, mg_backend.py and replay.player) get safe error replacement; keep _get_console behavior but add this global reconfiguration near process initialization (before UI modules are imported/used) to ensure coverage for third-party and direct sys.stdout writes.
52-65: Remove the redundant_environparameter and use a more specific exception handler.The code already acknowledges that setting
PYTHONIOENCODINGat runtime only affects subprocesses (line 53 comment), so that concern is addressed. However, two cleanups remain:
_environ=os.environ(line 64) is redundant. Rich usesos.environby default; explicitly passing it adds no value and relies on a private/underscored parameter designed primarily for testing.except Exception(line 66) is too broad. If Rich accepts all the provided kwargs, the only realistic failure is a version mismatch. Useexcept TypeErrorinstead to catch kwarg errors while letting other exceptions propagate.Suggested changes
_console = Console( force_terminal=True, legacy_windows=True, safe_box=True, emoji=False, color_system='standard', - _environ=os.environ ) - except Exception: + except TypeError: _console = Console(force_terminal=False, no_color=True)🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/praisonai/praisonai/cli/output/console.py` around lines 52 - 65, In the Console construction block where _console is created, remove the redundant private parameter `_environ=os.environ` from the Console(...) call and change the overly broad exception handler `except Exception` that follows to `except TypeError` so only keyword-argument/version mismatch errors are caught (let other exceptions propagate); keep the rest of the kwargs (force_terminal, legacy_windows, safe_box, emoji, color_system) unchanged and ensure the try/except directly surrounds the Console(...) instantiation that assigns to _console.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/praisonai/praisonai/__main__.py`:
- Around line 75-83: Extract the duplicated detection into a shared helper
module and replace the inline logic in __main__.py and console.py: create
functions is_legacy_windows_console() and ensure_utf8_subprocess_env() (names
must match) that normalize encoding via (getattr(sys.stdout, "encoding", "") or
"").lower().replace("-", ""), treat "utf8" and "cp65001" as non-legacy, and
consider encodings legacy only if they start with "cp" or are "ascii" or "mbcs";
have ensure_utf8_subprocess_env() call os.environ.setdefault("PYTHONIOENCODING",
"utf-8") only when is_legacy_windows_console() returns True; then import and
call ensure_utf8_subprocess_env() from __main__.py and from
cli/output/console.py instead of duplicating the logic.
- Around line 92-96: The UnicodeEncodeError handler around app() should be
improved: either remove the unused "as e" or include str(e) in the stderr
output; conditionally show the PowerShell/cmd guidance only when sys.platform ==
"win32" (or otherwise emit cross-platform instructions); and after catching
UnicodeEncodeError, call sys.stdout.reconfigure(errors='replace') and retry
app() once so help can render (and return exit status 0 on success) while still
printing a brief diagnostic that includes the encoding/error details and
platform-aware guidance.
---
Nitpick comments:
In `@src/praisonai/praisonai/cli/output/console.py`:
- Around line 43-44: Remove the redundant local imports of sys and os inside the
_get_console() function: locate the _get_console() function and delete the inner
"import sys" and "import os" lines since sys and os are already imported at
module top; ensure no other local references rely on those inner imports and run
tests/lint to confirm nothing else breaks.
- Around line 184-188: On UnicodeEncodeError in the console fallback (the try
around self.console.print), strip Rich markup from message using
rich.markup.strip_tags before printing and write to sys.stderr instead of
stdout; when encoding, use sys.stdout.encoding (or fallback to 'utf-8') with
errors='replace' rather than forcing ASCII so terminals that support extended
encodings can still render characters—update the except block that catches
UnicodeEncodeError to call rich.markup.strip_tags(message), encode using
sys.stdout.encoding with errors='replace', decode back, and print to sys.stderr.
- Around line 38-73: Several direct writes to sys.stdout in functions like
OutputController.print, rich_backend streaming, plain UI writers, mg_backend
status writes, and replay.player's direct Console construction bypass the safe
Console created by _get_console, so add a one-time fallback wrapper for legacy
Windows terminals: detect legacy Windows encoding (same logic used in
_get_console) at process startup and call
sys.stdout.reconfigure(errors='replace') and
sys.stderr.reconfigure(errors='replace') (or wrap with io.TextIOWrapper with
errors='replace') so all direct writes (including those in rich_backend.py,
plain.py, mg_backend.py and replay.player) get safe error replacement; keep
_get_console behavior but add this global reconfiguration near process
initialization (before UI modules are imported/used) to ensure coverage for
third-party and direct sys.stdout writes.
- Around line 52-65: In the Console construction block where _console is
created, remove the redundant private parameter `_environ=os.environ` from the
Console(...) call and change the overly broad exception handler `except
Exception` that follows to `except TypeError` so only keyword-argument/version
mismatch errors are caught (let other exceptions propagate); keep the rest of
the kwargs (force_terminal, legacy_windows, safe_box, emoji, color_system)
unchanged and ensure the try/except directly surrounds the Console(...)
instantiation that assigns to _console.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (2)
src/praisonai/praisonai/__main__.pysrc/praisonai/praisonai/cli/output/console.py
| import os | ||
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| # Set up safer encoding for Windows legacy terminals | ||
| if sys.platform == "win32" and hasattr(sys.stdout, 'encoding'): | ||
| encoding = getattr(sys.stdout, 'encoding', '').lower() | ||
| if encoding in ('cp1252', 'cp1251', 'cp850', 'ascii') or 'cp' in encoding: | ||
| # Force UTF-8 mode for subprocess safety | ||
| if 'PYTHONIOENCODING' not in os.environ: | ||
| os.environ['PYTHONIOENCODING'] = 'utf-8' |
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Same 'cp' in encoding false-positive as console.py, and same "too-late" PYTHONIOENCODING assignment.
This block duplicates the detection logic from cli/output/console.py and carries the same two defects:
'cp' in encodingmatchescp65001(Windows UTF-8 code page), misclassifying correctly-configured UTF-8 terminals as legacy. See my comment onconsole.pyline 50.- Setting
os.environ['PYTHONIOENCODING']='utf-8'here does not change the encoding of the current process'ssys.stdout(already initialized at interpreter startup); it only influences subprocesses. For the actual problem in issue#1543(praisonai --helpcrashing on CP1252), this line is a no-op — the real fix depends on Rich's safe-console configuration in_get_console().
Please extract the detection into a single shared helper to avoid the logic drifting between the two files. Example:
# praisonai/cli/output/encoding.py
def is_legacy_windows_console() -> bool:
if sys.platform != "win32":
return False
enc = (getattr(sys.stdout, "encoding", "") or "").lower().replace("-", "")
if enc in ("utf8", "cp65001"):
return False
return enc.startswith("cp") or enc in ("ascii", "mbcs")
def ensure_utf8_subprocess_env() -> None:
if is_legacy_windows_console():
os.environ.setdefault("PYTHONIOENCODING", "utf-8")Then both __main__.py and console.py import and call it.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@src/praisonai/praisonai/__main__.py` around lines 75 - 83, Extract the
duplicated detection into a shared helper module and replace the inline logic in
__main__.py and console.py: create functions is_legacy_windows_console() and
ensure_utf8_subprocess_env() (names must match) that normalize encoding via
(getattr(sys.stdout, "encoding", "") or "").lower().replace("-", ""), treat
"utf8" and "cp65001" as non-legacy, and consider encodings legacy only if they
start with "cp" or are "ascii" or "mbcs"; have ensure_utf8_subprocess_env() call
os.environ.setdefault("PYTHONIOENCODING", "utf-8") only when
is_legacy_windows_console() returns True; then import and call
ensure_utf8_subprocess_env() from __main__.py and from cli/output/console.py
instead of duplicating the logic.
| except UnicodeEncodeError as e: | ||
| # Handle Unicode encoding errors gracefully | ||
| print("Error: Unable to display help due to terminal encoding limitations.", file=sys.stderr) | ||
| print("Try setting: $env:PYTHONIOENCODING='utf-8' (PowerShell) or set PYTHONIOENCODING=utf-8 (cmd)", file=sys.stderr) | ||
| sys.exit(1) |
There was a problem hiding this comment.
Last-resort handler is reasonable; a couple of small suggestions.
Catching UnicodeEncodeError around app() is a good belt-and-braces move given that Typer/Click may still bypass the OutputController path when rendering help. A few minor polish points:
eis bound but unused — either dropas eor includestr(e)in the stderr message for debuggability (encoding name + failing codepoint are genuinely useful for triage).- The PowerShell guidance is Windows-only, but the handler triggers on any platform. Gate the message on
sys.platform == "win32"(or print both variants) to avoid confusing Linux/macOS users who somehow hit this path. - Consider also retrying
app()once aftersys.stdout.reconfigure(errors='replace')— that turns a hard failure into readable (if lossy) help output, which matches the acceptance criterion in issue#1543("--helpexits with status 0").
🛠️ Proposed fix
- try:
- app()
- except UnicodeEncodeError as e:
- # Handle Unicode encoding errors gracefully
- print("Error: Unable to display help due to terminal encoding limitations.", file=sys.stderr)
- print("Try setting: $env:PYTHONIOENCODING='utf-8' (PowerShell) or set PYTHONIOENCODING=utf-8 (cmd)", file=sys.stderr)
- sys.exit(1)
+ try:
+ app()
+ except UnicodeEncodeError as e:
+ # Re-try with replacement so --help still returns status 0 on legacy terminals.
+ try:
+ sys.stdout.reconfigure(errors="replace")
+ sys.stderr.reconfigure(errors="replace")
+ app()
+ return
+ except UnicodeEncodeError:
+ pass
+ print(f"Error: terminal cannot encode output ({e.encoding}).", file=sys.stderr)
+ if sys.platform == "win32":
+ print("Try: $env:PYTHONIOENCODING='utf-8' (PowerShell) or "
+ "set PYTHONIOENCODING=utf-8 (cmd)", file=sys.stderr)
+ sys.exit(1)🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@src/praisonai/praisonai/__main__.py` around lines 92 - 96, The
UnicodeEncodeError handler around app() should be improved: either remove the
unused "as e" or include str(e) in the stderr output; conditionally show the
PowerShell/cmd guidance only when sys.platform == "win32" (or otherwise emit
cross-platform instructions); and after catching UnicodeEncodeError, call
sys.stdout.reconfigure(errors='replace') and retry app() once so help can render
(and return exit status 0 on success) while still printing a brief diagnostic
that includes the encoding/error details and platform-aware guidance.
1 participant
Fixes #1543
Summary
Resolves the Unicode encoding error that occurs when running
praisonai --helpon Windows with legacy code pages (CP1252, CP850, etc.).Problem
The CLI help command crashed on Windows default terminals when Rich/Typer attempted to render Unicode characters (emojis, box-drawing characters) that cannot be represented by Windows legacy encoding schemes.
Solution
legacy_windows=True- Use legacy Windows modesafe_box=True- Use safe box characters instead of Unicodeemoji=False- Disable emojis that cause encoding issuescolor_system='standard'- Use basic color supportPYTHONIOENCODING=utf-8for subprocess safetyTest Plan
praisonai --helpworks on Windows CP1252 terminalsChanges
praisonai/__main__.pyto add encoding safety in Typer runnerpraisonai/cli/output/console.pywith Windows encoding detection and safe console creation🤖 Generated with Claude Code
Summary by CodeRabbit
Release Notes