107 lines
2.9 KiB
Markdown
107 lines
2.9 KiB
Markdown
# PPTX Image Compressor – Installation Logic
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## 1. Intro – One Line Summary
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> The script selects the best available Python environment, falls back to a self-installed embedded runtime if necessary, ensures `pip`, installs `svg-polish` when possible, and runs the application with graceful degradation.
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## 2. Lightweight Overview
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```text
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START
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│
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├─► Find usable Python
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│ ├─ venv (active / local)
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│ ├─ system Python
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│ └─ fallback: download embedded Python
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│
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├─► Ensure pip works
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│ ├─ pip exists → OK
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│ ├─ ensurepip → try fix
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│ └─ get-pip.py → fallback fix
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│
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├─► Install dependency
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│ └─ svg-polish (optional but preferred)
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│
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├─► Run main script
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│
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└─► END
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```
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---
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## 3. Detailed Logic Tree
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```text
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START
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│
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├─► [A] Pre-check: caesiumclt
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│ ├─ found → continue
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│ └─ not found → EXIT
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│
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├─► [B] Python resolution (priority-based)
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│ │
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│ ├─ Active venv (VIRTUAL_ENV)?
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│ │ └─ use it ✅
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│ │
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│ ├─ Local ".venv"?
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│ │ └─ use it ✅
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│ │
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│ ├─ Local "venv"?
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│ │ └─ use it ✅
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│ │
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│ ├─ System Python (python.exe, excluding WindowsApps)?
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│ │ └─ use it ✅
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│ │
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│ ├─ Python launcher (py.exe)?
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│ │ └─ use py -3 ✅
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│ │
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│ ├─ Existing embedded Python?
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│ │ └─ use it ✅
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│ │
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│ └─ NONE FOUND →
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│ ├─ Download embeddable Python
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│ ├─ Extract to python-embed
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│ ├─ Fix isolation (enable "import site")
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│ └─ use it ✅
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│
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├─► [C] Validate main script exists
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│ ├─ missing → EXIT
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│ └─ exists → continue
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│
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├─► [D] Ensure pip availability
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│ │
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│ ├─ pip works?
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│ │ └─ YES → continue ✅
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│ │
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│ └─ NO →
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│ ├─ try: ensurepip
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│ │ ├─ success → ✅
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│ │ └─ fail →
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│ │
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│ └─ if embedded Python:
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│ ├─ download get-pip.py
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│ ├─ execute it
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│ ├─ remove file
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│ └─ re-check pip
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│
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│ ├─ still no pip →
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│ │ └─ WARN: disable SVG compression
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│ │
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│ └─ pip available →
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│ ✅ continue
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│
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├─► [E] Install dependency
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│ ├─ install svg-polish
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│ │ ├─ success → ✅ SVG enabled
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│ │ └─ fail → ⚠ SVG disabled
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│ │
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│ └─ optional debug: pip list
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│
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├─► [F] Run application
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│ ├─ execute Python script
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│ ├─ capture return code
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│ ├─ success → "Fertig"
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│ └─ error → report exit code
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│
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└─► END
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``` |