# Grantlee5 to KTextTemplate Porting Summary

## Overview
Successfully ported the CodeGen module from Grantlee5 (Qt5) to KTextTemplate (Qt6/KF6).

## Date
2026-01-07

## Changes Made

### Files Modified (9 files, 29 insertions, 38 deletions)

1. **CMakeLists.txt**
   - Changed `FIND_PACKAGE(Grantlee5 REQUIRED COMPONENTS Templates)` → `FIND_PACKAGE(KF6TextTemplate REQUIRED)`
   - Changed `TARGET Grantlee5::Templates` → `TARGET KF6::TextTemplate` (3 occurrences)
   - Updated comments to reference KTextTemplate

2. **GeneratorGrantleeBase.h**
   - Removed forward declarations: `namespace Grantlee { class Engine; class Context; class Template; }`
   - Added includes: `<ktexttemplate/template.h>`, `<ktexttemplate/context.h>`, `<ktexttemplate/engine.h>`
   - Changed all `Grantlee::` → `KTextTemplate::` (Engine, Context, Template)

3. **GeneratorGrantleeBase.cpp**
   - Removed `#include <grantlee/engine.h>` and `<grantlee/context.h>`
   - Added `#include <ktexttemplate/engine.h>` and `<ktexttemplate/context.h>`
   - Changed `Grantlee::Engine` → `KTextTemplate::Engine`
   - Changed `Grantlee::Context` → `KTextTemplate::Context`

4. **DaoGeneratorGrantlee.cpp**
   - Changed `#include <grantlee/context.h>` → `#include <ktexttemplate/context.h>`

5. **DatabaseGeneratorGrantlee.cpp**
   - Changed `#include <grantlee/context.h>` → `#include <ktexttemplate/context.h>`

6. **CppTopicGeneratorGrantlee.cpp**
   - Changed `#include <grantlee/context.h>` → `#include <ktexttemplate/context.h>`

7. **main_grantlee_gui.h**
   - Changed forward declaration: `namespace Grantlee { class Engine; }` → `namespace KTextTemplate { class Engine; }`
   - Changed member: `Grantlee::Engine*` → `KTextTemplate::Engine*`

8. **main_grantlee_gui.cpp**
   - Removed `#include <grantlee/engine.h>`
   - Changed `new Grantlee::Engine` → `new KTextTemplate::Engine`

9. **tests/GrantleeParserSmoke.cpp**
   - Changed all includes from `<grantlee/*.h>` → `<ktexttemplate/*.h>`
   - Changed `Grantlee::Engine` → `KTextTemplate::Engine`
   - Changed `Grantlee::FileSystemTemplateLoader` → `KTextTemplate::FileSystemTemplateLoader`
   - Changed `Grantlee::Template` → `KTextTemplate::Template`
   - Changed `Grantlee::NoError` → `KTextTemplate::NoError`
   - Changed `Grantlee::Context` → `KTextTemplate::Context`

### Files NOT Modified (No Changes Needed)

- **GrantleeWrappers.h/.cpp**: Pure QObject-derived wrapper classes with Q_PROPERTY, no direct Grantlee dependencies
- **main_grantlee.cpp**: No direct Grantlee usage
- **All .grantlee template files**: Template syntax is compatible between Grantlee5 and KTextTemplate

## API Compatibility

KTextTemplate API is nearly identical to Grantlee5:
- `Grantlee::Engine` → `KTextTemplate::Engine`
- `Grantlee::Context` → `KTextTemplate::Context`
- `Grantlee::Template` → `KTextTemplate::Template` (typedef for `QSharedPointer<TemplateImpl>`)
- `Grantlee::FileSystemTemplateLoader` → `KTextTemplate::FileSystemTemplateLoader`
- `Grantlee::NoError` → `KTextTemplate::NoError`

## Build Requirements

### Runtime Dependencies
- **Ubuntu 26.04** (or other distro with KF6 packages)
- **libkf6texttemplate-dev** package
- Qt6 (KF6)

### CMake Configuration
```cmake
FIND_PACKAGE(KF6TextTemplate REQUIRED)
TARGET_LINK_LIBRARIES(your_target PRIVATE KF6::TextTemplate)
```

## Build Instructions

### Using Docker (Required on Ubuntu 22.04)
Since Ubuntu 22.04 doesn't have KTextTemplate, build must be done in Docker with Ubuntu 26.04:

```bash
# Create Docker container with Ubuntu 26.04
docker run -it --rm -v $(pwd):/workspace ubuntu:26.04 bash

# Inside container:
apt-get update
apt-get install -y libkf6texttemplate-dev qt6-base-dev cmake build-essential

cd /workspace/qt6-after/qt6-migrated-legatus
cmake -B build-qt6 -G Ninja -DCMAKE_BUILD_TYPE=Debug -DBUILD_GRANTLEE=ON
cmake --build build-qt6 --target codegen_grantlee
```

### Native Build (Ubuntu 26.04+)
```bash
cd qt6-after/qt6-migrated-legatus
cmake -B build-qt6 -G Ninja -DCMAKE_BUILD_TYPE=Debug -DBUILD_GRANTLEE=ON
cmake --build build-qt6 --target codegen_grantlee
```

## Testing

### Smoke Test
The `GrantleeParserSmoke` test validates all .grantlee template files:

```bash
# After building
cd build-qt6/Lts/Common/CodeGen
ctest -R GrantleeParserSmoke -V
# Or run directly:
./grantlee_parser_smoke /path/to/Lts/Common/CodeGen
```

The smoke test:
- Scans for all `.grantlee` files in the CodeGen directory
- Attempts to parse each template file
- Reports any parse or render errors
- Tests 58 template files (29 Qt5 legacy + 29 Qt6 migrated)

### Template Files Tested
- svc.idl.grantlee
- svc_enums.idl.grantlee
- svc_translation.cpp.grantlee
- svc_translation.h.grantlee
- svc_dao.cpp.grantlee
- svc_dao.h.grantlee
- svc_db.h.grantlee
- svc_db_impl.h.grantlee
- svc_db_impl.cpp.grantlee
- svc_dtc.h.grantlee
- svc_dtc_impl.cpp.grantlee
- svc_dtc_impl.h.grantlee
- svc_dts.h.grantlee
- svc_dts_impl.cpp.grantlee
- svc_dts_impl.h.grantlee
- svc_ftc.h.grantlee
- svc_ftc_impl.cpp.grantlee
- svc_ftc_impl.h.grantlee
- svc_fts.h.grantlee
- svc_fts_impl.cpp.grantlee
- svc_fts_impl.h.grantlee
- svc_json.cpp.grantlee
- svc_json.h.grantlee
- svc_topic_type_plugin.cpp.grantlee
- svc_topic_type_plugin.h.grantlee
- svc_record_replay_plugin.cpp.grantlee
- svc_record_replay_plugin.h.grantlee
- (Plus Qt5 legacy versions)

## Verification Checklist

- [x] All `Grantlee::` namespace references replaced with `KTextTemplate::`
- [x] All `#include <grantlee/...>` changed to `#include <ktexttemplate/...>`
- [x] CMakeLists.txt updated to use `KF6TextTemplate` and `KF6::TextTemplate`
- [x] No remaining Grantlee5 dependencies in source code
- [ ] Build successful with KTextTemplate (requires Ubuntu 26.04 or Docker)
- [ ] Smoke test passes against all 58 .grantlee files
- [ ] Code generation works correctly for all actions (dao, database, idl, dds_topics, etc.)
- [ ] Generated code compiles and functions correctly

## Known Issues / Notes

1. **Build Environment**: Host system (Ubuntu 22.04) lacks KTextTemplate; Docker or Ubuntu 26.04 required
2. **API Compatibility**: KTextTemplate API appears 100% compatible with Grantlee5 for the used features
3. **Template Syntax**: .grantlee template files require no changes - syntax is identical
4. **Wrapper Classes**: GrantleeWrappers.h/.cpp are pure QObject classes with no Grantlee dependencies

## Next Steps

1. **Build in Docker**: Create/run Docker container with Ubuntu 26.04 and libkf6texttemplate-dev
2. **Compile CodeGen module**: Build `codegen_grantlee` target
3. **Run smoke test**: Execute `GrantleeParserSmoke` to validate all templates
4. **Test code generation**: Run `ngl_codegen` with various actions against real IDL/XML files
5. **Verify generated code**: Ensure generated C++ code compiles and works correctly
6. **Integration**: Verify CodeGen integrates properly with Qt6 build system

## References

- Original task: `grantlee-parser-toktexttemplate-porting.prompt.md`
- KTextTemplate docs: https://api.kde.org/frameworks/ktexttemplate/html/
- Grantlee5 docs: https://www.grantlee.org/
- Docker reference: `Lts/Tools/Niklas-Excon-Helper/Dockerfile` (shows Ubuntu 26.04 base)