UPDATE: add sketchy implementation for porting ColorTextEdtior

Note that we've added an function `get_current_context_ptr()`
to pass pointer of `ImGuiContext` since we cannot access the actual
memory address of it by the value returned by a Cython-wrapped
`get_current_context()` function. (just like the reason mentioned
in [1], a C object will be wrapped by a Python object, so that
we cannot access its real address even if we have defined a `_ptr`
field in the Cython extension class)

Besides, those functions for setting/getting context should also
be implemented in `pyimgui` (i.e. `get_current_context_ptr()` and
`set_current_context_ptr()`, but at least the former one).

And note that this might not be a good solution since we have to
expose the real address of internal object, so that these functions
are classified as workarounds and we should figure out a better
ones in the future.

[1]: NaleRaphael/codememo#1

.gitignore

@@ -0,0 +1,124 @@
+# cpp files generated by Cython
+colortextedit/*.cpp
+colortextedit/*.h
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+*.dll
+
+# os-specific stuff
+.DS_Store
+
+# imgui runtime configuration
+imgui.ini
+
+# C extensions
+*.so
+
+# Cython related
+cython_debug/
+imgui/*.cpp
+imgui/*.h
+imgui/*.c
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+completion.svg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+doc/_build/
+doc/build
+
+# following is autogenerated
+doc/source/readme.rst
+
+# PyBuilder
+target/
+
+# IPython Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# dotenv
+.env
+
+# virtualenv
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+
+# Rope project settings
+.ropeproject
+
+# Pycharm project settings
+.idea/
+
+# Visual Studio Code project settings
+.vscode/
+
+# Bootstrap marker
+.bootstrapped
+
+# Fonts
+*.ttf
+*.otf

colortextedit/__init__.py

@@ -0,0 +1,2 @@
+from colortextedit import texteditor
+from colortextedit.texteditor import *

colortextedit/ctextedit.pxd

@@ -0,0 +1,205 @@
+# -*- coding: utf-8 -*-
+# distutils: language = c++
+# distutils: include_dirs = imgui-cpp imgui-colortextedit
+from libcpp cimport bool
+
+# See also: https://cython.readthedocs.io/en/latest/src/userguide/wrapping_CPlusPlus.html#standard-library
+from libcpp.string cimport string
+from libcpp.vector cimport vector
+from libcpp.utility cimport pair
+
+
+cdef extern from "imgui.h":
+    ctypedef struct ImDrawChannel
+    ctypedef struct ImDrawCmd
+    ctypedef struct ImDrawData
+    ctypedef struct ImDrawList
+    ctypedef struct ImDrawListSharedData
+    ctypedef struct ImDrawVert
+    ctypedef struct ImFont
+    ctypedef struct ImFontAtlas
+    ctypedef struct ImFontConfig
+    ctypedef struct ImColor
+    ctypedef struct ImGuiIO
+    ctypedef struct ImGuiOnceUponAFrame
+    ctypedef struct ImGuiStorage
+    ctypedef struct ImGuiTextFilter
+    ctypedef struct ImGuiTextBuffer
+    ctypedef struct ImGuiInputTextCallbackData
+    ctypedef struct ImGuiSizeCallbackData
+    ctypedef struct ImGuiListClipper
+    ctypedef struct ImGuiPayload
+    ctypedef struct ImGuiContext
+
+    ctypedef void* ImTextureID
+    ctypedef unsigned int ImU32
+    ctypedef unsigned int ImGuiID
+    ctypedef unsigned short ImWchar
+    ctypedef int ImGuiCol
+    ctypedef int ImGuiDataType
+    ctypedef int ImGuiDir
+    ctypedef int ImGuiCond
+    ctypedef int ImGuiKey
+    ctypedef int ImGuiNavInput
+    ctypedef int ImGuiMouseCursor
+    ctypedef int ImGuiStyleVar
+    ctypedef int ImDrawCornerFlags
+    ctypedef int ImDrawListFlags
+    ctypedef int ImFontAtlasFlags
+    ctypedef int ImGuiBackendFlags
+    ctypedef int ImGuiColorEditFlags
+    ctypedef int ImGuiColumnsFlags
+    ctypedef int ImGuiConfigFlags
+    ctypedef int ImGuiComboFlags
+    ctypedef int ImGuiDragDropFlags
+    ctypedef int ImGuiFocusedFlags
+    ctypedef int ImGuiHoveredFlags
+    ctypedef int ImGuiInputTextFlags
+    ctypedef int ImGuiSelectableFlags
+    ctypedef int ImGuiTreeNodeFlags
+    ctypedef int ImGuiWindowFlags
+    ctypedef int (*ImGuiInputTextCallback)(ImGuiInputTextCallbackData *data);
+    ctypedef void (*ImGuiSizeCallback)(ImGuiSizeCallbackData* data);
+
+    ctypedef struct ImVec2:
+        float x
+        float y
+
+    ctypedef struct ImVec4:
+        float x
+        float y
+        float z
+        float w
+
+
+    ctypedef struct ImGuiIO:
+        ImGuiConfigFlags   ConfigFlags
+        ImGuiBackendFlags  BackendFlags
+        ImVec2        DisplaySiz
+        float         DeltaTime
+        float         IniSavingRate
+        const char*   IniFilename
+        const char*   LogFilename
+        float         MouseDoubleClickTime
+        float         MouseDoubleClickMaxDist
+        float         MouseDragThreshold
+        int*          KeyMap
+        float         KeyRepeatDelay
+        float         KeyRepeatRate
+        void*         UserData
+
+        ImFontAtlas*  Fonts
+        float         FontGlobalScale
+        bool          FontAllowUserScaling
+        ImVec2        DisplayFramebufferScale
+        ImVec2        DisplayVisibleMin
+        ImVec2        DisplayVisibleMax
+        bool          ConfigMacOSXBehaviors
+        bool          ConfigInputTextCursorBlink
+        bool          ConfigResizeWindowsFromEdges
+
+        const char* (*GetClipboardTextFn)(void* user_data) except +
+        void        (*SetClipboardTextFn)(void* user_data, const char* text) except +
+        void*       ClipboardUserData
+
+        void*       (*MemAllocFn)(size_t sz) except +
+        void        (*MemFreeFn)(void* ptr) except +
+        void        (*ImeSetInputScreenPosFn)(int x, int y) except +
+        void*       ImeWindowHandle
+
+        ImVec2      MousePos
+        bool        MouseDown[5]
+        float       MouseWheel
+        float       MouseWheelH
+        bool        MouseDrawCursor
+        bool        KeyCtrl
+        bool        KeyShift
+        bool        KeyAlt
+        bool        KeySuper
+        bool        KeysDown[512]
+        ImWchar     InputCharacters[16+1]
+
+        void        AddInputCharacter(ImWchar c) except +
+        void        AddInputCharactersUTF8(const char* utf8_chars) except +
+        void        ClearInputCharacters() except +
+
+        bool        WantCaptureMouse
+        bool        WantCaptureKeyboard
+        bool        WantTextInput
+        bool        WantSetMousePos
+        bool        WantSaveIniSettings
+        bool        NavActive
+        bool        NavVisible
+        float       Framerate
+        int         MetricsRenderVertices
+        int         MetricsRenderIndices
+        int         MetricsActiveWindows
+        ImVec2      MouseDelta
+
+
+cdef extern from "imgui.h" namespace "ImGui":
+    ImGuiContext* CreateContext(
+            ImFontAtlas* shared_font_atlas
+    ) except +
+    void DestroyContext(ImGuiContext* ctx) except +
+    ImGuiContext* GetCurrentContext() except +
+    void SetCurrentContext(ImGuiContext* ctx) except +
+    bool DebugCheckVersionAndDataLayout(const char* version_str, size_t sz_io, size_t sz_style, size_t sz_vec2, size_t sz_vec4, size_t sz_drawvert) except +
+
+
+cdef extern from "TextEditor.h":
+    cdef cppclass TextEditor:
+        void SetLanguageDefinition(const LanguageDefinition& aLanguageDef) except +
+        const LanguageDefinition& GetLanguageDefinition() except +
+
+        const Palette& GetPalette() except +
+        void SetPalette(const Palette& aValue) except +
+
+        void Render(const char* aTitle, const ImVec2& aSize, bool aBorder) except +
+
+
+cdef extern from "TextEditor.h" namespace "TextEditor":
+    cdef cppclass PaletteIndex:
+        pass
+
+    cdef cppclass SelectionMode:
+        pass
+
+    ctypedef pair[string, PaletteIndex] TokenRegexString
+    ctypedef vector[TokenRegexString] TokenRegexStrings
+    ctypedef struct Palette
+
+    ctypedef struct LanguageDefinition:
+        TokenRegexString TokenRegexString
+        TokenRegexStrings TokenRegexStrings
+
+
+cdef extern from "TextEditor.h" namespace "PaletteIndex":
+    cdef PaletteIndex Default
+    cdef PaletteIndex KeyWord
+    cdef PaletteIndex Number
+    cdef PaletteIndex String
+    cdef PaletteIndex CharLiteral
+    cdef PaletteIndex Punctuation
+    cdef PaletteIndex Preprocessor
+    cdef PaletteIndex Identifier
+    cdef PaletteIndex KnownIdentifier
+    cdef PaletteIndex PreprocIdentifier
+    cdef PaletteIndex Comment
+    cdef PaletteIndex MultiLineComment
+    cdef PaletteIndex Background
+    cdef PaletteIndex Cursor
+    cdef PaletteIndex Selection
+    cdef PaletteIndex ErrorMarker
+    cdef PaletteIndex Breakpoint
+    cdef PaletteIndex LineNumber
+    cdef PaletteIndex CurrentLineFill
+    cdef PaletteIndex CurrentLineFillInactive
+    cdef PaletteIndex CurrentLineEdge
+    cdef PaletteIndex Max
+
+
+cdef extern from "TextEditor.h" namespace "SelectionMode":
+    cdef SelectionMode Normal
+    cdef SelectionMode Word
+    cdef SelectionMode Line