opt: add group by metadata

[xiaoyifang]

close #612

[shenlebantongying]

If we implement more features on metadata.txt, then we will have to maintain it.

The format will be locked unless we want to break someone and got hated.

If it ever got expanded, we will reinvent a config format.

This will happen because renaming will also likely be implemented here.

Maybe we should consider using existing human-oriented formats like toml https://toml.io/ so that we don't need to maintain/write related parsing code?

Of course, it is not hard, but like the custom command line parser, there are details like report errors on typos / write-to-config that requires unnecessary work. Also, we don't need to describe the syntax, just link to https://toml.io/

But, so far I can only think about 4 possible fields in future 😅

Category = [ "english", "yellow", "green" ]

[metadata]
name = "New Name"
langfrom = "English"
langto = "Russian"

[xiaoyifang]

Maybe we should consider using existing human-oriented formats like toml https://toml.io/ so that we don't need to maintain/write related parsing code?

are there some c++ library which can use to parse the toml format ?

[shenlebantongying]

How about this: https://github.com/marzer/tomlplusplus

We just need to include a single file into the source tree https://github.com/marzer/tomlplusplus/blob/master/toml.hpp

or

git submodule add --depth 1 https://github.com/marzer/tomlplusplus.git thirdparty/tomlplusplus

# in qmake
INCLUDEPATH += thirdparty/tomlplusplus/include

# in cmake

target_include_directories(${CMAKE_PROJECT_NAME} PUBLIC
        ${PROJECT_SOURCE_DIR}/thirdparty/tomlplusplus/include

[xiaoyifang]

Great, I'll see what I can do .

[xiaoyifang]

I'm really not comfortable/familiar with this modern syntax of tomlplus 😿

[shenlebantongying]

You seems forget to add the submodule,

[shenlebantongying]

btw, toml++ includes 3 formatters (toml, yml & json:sweat_smile: ), if we don't need them we can

DEFINES += TOML_ENABLE_FORMATTERS=0

target_compile_definitions(${CMAKE_PROJECT_NAME} PUBLIC TOML_ENABLE_FORMATTERS=0)  

marzer/tomlplusplus#158

[xiaoyifang]

btw, toml++ includes 3 formatters (toml, yml & json😅 ), if we don't need them we can

DEFINES += TOML_ENABLE_FORMATTERS=0

target_compile_definitions(${CMAKE_PROJECT_NAME} PUBLIC TOML_ENABLE_FORMATTERS=0)  

marzer/tomlplusplus#158

the author said that this will not effect performance and size.

[shenlebantongying]

I tested with some invalid inputs, and the code works OK to me :D

[sonarqubecloud]

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