display

Layout and Rendering TUI library

git clone git://git.dimitrijedobrota.com/display.git

commit	1d05e0bbf99a8b3a2ba1b71945b3ad3683df06d0
author	Dimitrije Dobrota <mail@dimitrijedobrota.com>
date	Fri, 31 Jan 2025 19:24:37 +0100

Initial commit

Diffstat:

A	.clang-format	\|	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	.clang-tidy	\|	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	.codespellrc	\|	++++++
A	.gitignore	\|	+++++++++++++
A	BUILDING.md	\|	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	CMakeLists.txt	\|	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	CMakePresets.json	\|	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	CODE_OF_CONDUCT.md	\|	+++++
A	CONTRIBUTING.md	\|	+++++++++++++++++++
A	HACKING.md	\|	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	README.md	\|	+++++++++++++++++++
A	cmake/coverage.cmake	\|	+++++++++++++++++++++++++++++++++
A	cmake/dev-mode.cmake	\|	+++++++++++
A	cmake/folders.cmake	\|	+++++++++++++++++++++
A	cmake/install-config.cmake	\|	+
A	cmake/install-rules.cmake	\|	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	cmake/lint-targets.cmake	\|	+++++++++++++++++++++++++++++++++
A	cmake/lint.cmake	\|	+++++++++++++++++++++++++++++++++++++++++++++++++++
A	cmake/prelude.cmake	\|	++++++++++
A	cmake/project-is-top-level.cmake	\|	++++++
A	cmake/spell-targets.cmake	\|	++++++++++++++++++++++
A	cmake/spell.cmake	\|	+++++++++++++++++++++++++++++
A	cmake/variables.cmake	\|	+++++++++++++++++++++++++++++++++++++++++
A	example/CMakeLists.txt	\|	+++++++++++++++++++++++++
A	example/example.cpp	\|	+++
A	include/display/display.hpp	\|	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	source/display.cpp	\|	+++++++++++++

27 files changed, 1332 insertions(+), 0 deletions(-)

diff --git a/.clang-format b/.clang-format

@@ -0,0 +1,178 @@

---

Language: Cpp

# BasedOnStyle: Chromium

AccessModifierOffset: -2

AlignAfterOpenBracket: Align

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BreakAfterJavaFieldAnnotations: true

BreakStringLiterals: true

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...

diff --git a/.clang-tidy b/.clang-tidy

@@ -0,0 +1,155 @@

---

# Enable ALL the things! Except not really

# misc-non-private-member-variables-in-classes: the options don't do anything

# modernize-use-nodiscard: too aggressive, attribute is situationally useful

Checks: "*,\

-google-readability-todo,\

-altera-*,\

-fuchsia-*,\

fuchsia-multiple-inheritance,\

-llvm-header-guard,\

-llvm-include-order,\

-llvmlibc-*,\

-modernize-use-nodiscard,\

-misc-non-private-member-variables-in-classes"

WarningsAsErrors: ''

CheckOptions:

- key: 'bugprone-argument-comment.StrictMode'

value: 'true'

# Prefer using enum classes with 2 values for parameters instead of bools

- key: 'bugprone-argument-comment.CommentBoolLiterals'

value: 'true'

- key: 'bugprone-misplaced-widening-cast.CheckImplicitCasts'

value: 'true'

- key: 'bugprone-sizeof-expression.WarnOnSizeOfIntegerExpression'

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value: 'true'

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value: 'true'

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value: 'lower_case'

...

diff --git a/.codespellrc b/.codespellrc

@@ -0,0 +1,6 @@

[codespell]

builtin = clear,rare,en-GB_to_en-US,names,informal,code

check-filenames =

check-hidden =

skip = */.git,*/build,*/prefix

quiet-level = 2

diff --git a/.gitignore b/.gitignore

@@ -0,0 +1,13 @@

**/.DS_Store

.idea/

.vs/

.vscode/

build/

cmake-build-*/

prefix/

.clangd

CMakeLists.txt.user

CMakeUserPresets.json

compile_commands.json

env.bat

env.ps1

diff --git a/BUILDING.md b/BUILDING.md

@@ -0,0 +1,89 @@

# Building with CMake

## Build

This project doesn't require any special command-line flags to build to keep

things simple.

Here are the steps for building in release mode with a single-configuration

generator, like the Unix Makefiles one:

```sh

cmake -S . -B build -D CMAKE_BUILD_TYPE=Release

cmake --build build

```

Here are the steps for building in release mode with a multi-configuration

generator, like the Visual Studio ones:

```sh

cmake -S . -B build

cmake --build build --config Release

```

### Building with MSVC

Note that MSVC by default is not standards compliant and you need to pass some

flags to make it behave properly. See the `flags-msvc` preset in the

[CMakePresets.json](CMakePresets.json) file for the flags and with what

variable to provide them to CMake during configuration.

### Building on Apple Silicon

CMake supports building on Apple Silicon properly since 3.20.1. Make sure you

have the [latest version][1] installed.

## Install

This project doesn't require any special command-line flags to install to keep

things simple. As a prerequisite, the project has to be built with the above

commands already.

The below commands require at least CMake 3.15 to run, because that is the

version in which [Install a Project][2] was added.

Here is the command for installing the release mode artifacts with a

single-configuration generator, like the Unix Makefiles one:

```sh

cmake --install build

```

Here is the command for installing the release mode artifacts with a

multi-configuration generator, like the Visual Studio ones:

```sh

cmake --install build --config Release

```

### CMake package

This project exports a CMake package to be used with the [`find_package`][3]

command of CMake:

* Package name: `display`

* Target name: `display::display`

Example usage:

```cmake

find_package(display REQUIRED)

# Declare the imported target as a build requirement using PRIVATE, where

# project_target is a target created in the consuming project

target_link_libraries(

project_target PRIVATE

display::display

)

```

### Note to packagers

The `CMAKE_INSTALL_INCLUDEDIR` is set to a path other than just `include` if

the project is configured as a top level project to avoid indirectly including

other libraries when installed to a common prefix. Please review the

[install-rules.cmake](cmake/install-rules.cmake) file for the full set of

install rules.

[1]: https://cmake.org/download/

[2]: https://cmake.org/cmake/help/latest/manual/cmake.1.html#install-a-project

[3]: https://cmake.org/cmake/help/latest/command/find_package.html

diff --git a/CMakeLists.txt b/CMakeLists.txt

@@ -0,0 +1,77 @@

cmake_minimum_required(VERSION 3.14)

include(cmake/prelude.cmake)

project(

display

VERSION 0.1.0

DESCRIPTION "TUI library"

HOMEPAGE_URL "https://example.com/"

LANGUAGES CXX

)

include(cmake/project-is-top-level.cmake)

include(cmake/variables.cmake)

# ---- Declare library ----

add_library(

display_display

source/display.cpp

)

add_library(display::display ALIAS display_display)

include(GenerateExportHeader)

generate_export_header(

display_display

BASE_NAME display

EXPORT_FILE_NAME export/display/display_export.hpp

CUSTOM_CONTENT_FROM_VARIABLE pragma_suppress_c4251

)

if(NOT BUILD_SHARED_LIBS)

target_compile_definitions(display_display PUBLIC DISPLAY_STATIC_DEFINE)

endif()

set_target_properties(

display_display PROPERTIES

CXX_VISIBILITY_PRESET hidden

VISIBILITY_INLINES_HIDDEN YES

VERSION "${PROJECT_VERSION}"

SOVERSION "${PROJECT_VERSION_MAJOR}"

EXPORT_NAME display

OUTPUT_NAME display

)

target_include_directories(

display_display ${warning_guard}

PUBLIC

"\$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>"

)

target_include_directories(

display_display SYSTEM

PUBLIC

"\$<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/export>"

)

target_compile_features(display_display PUBLIC cxx_std_20)

# ---- Install rules ----

if(NOT CMAKE_SKIP_INSTALL_RULES)

include(cmake/install-rules.cmake)

endif()

# ---- Developer mode ----

if(NOT display_DEVELOPER_MODE)

return()

elseif(NOT PROJECT_IS_TOP_LEVEL)

message(

AUTHOR_WARNING

"Developer mode is intended for developers of display"

)

endif()

include(cmake/dev-mode.cmake)

diff --git a/CMakePresets.json b/CMakePresets.json

@@ -0,0 +1,160 @@

{

"version": 2,

"cmakeMinimumRequired": {

"major": 3,

"minor": 14,

"patch": 0

"configurePresets": [

{

"name": "cmake-pedantic",

"hidden": true,

"warnings": {

"dev": true,

"deprecated": true,

"uninitialized": true,

"unusedCli": true,

"systemVars": false

"errors": {

"dev": true,

"deprecated": true

}

{

"name": "dev-mode",

"hidden": true,

"inherits": "cmake-pedantic",

"cacheVariables": {

"display_DEVELOPER_MODE": "ON"

}

{

"name": "cppcheck",

"hidden": true,

"cacheVariables": {

"CMAKE_CXX_CPPCHECK": "cppcheck;--inline-suppr"

}

{

"name": "clang-tidy",

"hidden": true,

"cacheVariables": {

"CMAKE_CXX_CLANG_TIDY": "clang-tidy;--header-filter=^${sourceDir}/"

}

{

"name": "ci-std",

"description": "This preset makes sure the project actually builds with at least the specified standard",

"hidden": true,

"cacheVariables": {

"CMAKE_CXX_EXTENSIONS": "OFF",

"CMAKE_CXX_STANDARD": "20",

"CMAKE_CXX_STANDARD_REQUIRED": "ON"

}

{

"name": "flags-gcc-clang",

"description": "These flags are supported by both GCC and Clang",

"hidden": true,

"cacheVariables": {

"CMAKE_CXX_FLAGS": "-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -D_GLIBCXX_ASSERTIONS=1 -fstack-protector-strong -fcf-protection=full -fstack-clash-protection -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -Wcast-qual -Wformat=2 -Wundef -Werror=float-equal -Wshadow -Wcast-align -Wunused -Wnull-dereference -Wdouble-promotion -Wimplicit-fallthrough -Wextra-semi -Woverloaded-virtual -Wnon-virtual-dtor -Wold-style-cast",

"CMAKE_EXE_LINKER_FLAGS": "-Wl,--allow-shlib-undefined,--as-needed,-z,noexecstack,-z,relro,-z,now,-z,nodlopen",

"CMAKE_SHARED_LINKER_FLAGS": "-Wl,--allow-shlib-undefined,--as-needed,-z,noexecstack,-z,relro,-z,now,-z,nodlopen"

}

{

"name": "flags-appleclang",

"hidden": true,

"cacheVariables": {

"CMAKE_CXX_FLAGS": "-fstack-protector-strong -Wall -Wextra -Wpedantic -Wconversion -Wsign-conversion -Wcast-qual -Wformat=2 -Wundef -Werror=float-equal -Wshadow -Wcast-align -Wunused -Wnull-dereference -Wdouble-promotion -Wimplicit-fallthrough -Wextra-semi -Woverloaded-virtual -Wnon-virtual-dtor -Wold-style-cast"

}

{

"name": "flags-msvc",

"description": "Note that all the flags after /W4 are required for MSVC to conform to the language standard",

"hidden": true,

"cacheVariables": {

"CMAKE_CXX_FLAGS": "/sdl /guard:cf /utf-8 /diagnostics:caret /w14165 /w44242 /w44254 /w44263 /w34265 /w34287 /w44296 /w44365 /w44388 /w44464 /w14545 /w14546 /w14547 /w14549 /w14555 /w34619 /w34640 /w24826 /w14905 /w14906 /w14928 /w45038 /W4 /permissive- /volatile:iso /Zc:inline /Zc:preprocessor /Zc:enumTypes /Zc:lambda /Zc:__cplusplus /Zc:externConstexpr /Zc:throwingNew /EHsc",

"CMAKE_EXE_LINKER_FLAGS": "/machine:x64 /guard:cf",

"CMAKE_SHARED_LINKER_FLAGS": "/machine:x64 /guard:cf"

}

{

"name": "ci-linux",

"inherits": ["flags-gcc-clang", "ci-std"],

"generator": "Unix Makefiles",

"hidden": true,

"cacheVariables": {

"CMAKE_BUILD_TYPE": "Release"

}

{

"name": "ci-darwin",

"inherits": ["flags-appleclang", "ci-std"],

"generator": "Xcode",

"hidden": true

{

"name": "ci-win64",

"inherits": ["flags-msvc", "ci-std"],

"generator": "Visual Studio 17 2022",

"architecture": "x64",

"hidden": true

{

"name": "coverage-linux",

"binaryDir": "${sourceDir}/build/coverage",

"inherits": "ci-linux",

"hidden": true,

"cacheVariables": {

"ENABLE_COVERAGE": "ON",

"CMAKE_BUILD_TYPE": "Coverage",

"CMAKE_CXX_FLAGS_COVERAGE": "-Og -g --coverage -fkeep-inline-functions -fkeep-static-functions",

"CMAKE_EXE_LINKER_FLAGS_COVERAGE": "--coverage",

"CMAKE_SHARED_LINKER_FLAGS_COVERAGE": "--coverage"

}

{

"name": "ci-coverage",

"inherits": ["coverage-linux", "dev-mode"],

"cacheVariables": {

"COVERAGE_HTML_COMMAND": ""

}

{

"name": "ci-sanitize",

"binaryDir": "${sourceDir}/build/sanitize",

"inherits": ["ci-linux", "dev-mode"],

"cacheVariables": {

"CMAKE_BUILD_TYPE": "Sanitize",

"CMAKE_CXX_FLAGS_SANITIZE": "-U_FORTIFY_SOURCE -O2 -g -fsanitize=address,undefined -fno-omit-frame-pointer -fno-common"

}

{

"name": "ci-build",

"binaryDir": "${sourceDir}/build",

"hidden": true

{

"name": "ci-multi-config",

"description": "Speed up multi-config generators by generating only one configuration instead of the defaults",

"hidden": true,

"cacheVariables": {

"CMAKE_CONFIGURATION_TYPES": "Release"

}

{

"name": "ci-macos",

"inherits": ["ci-build", "ci-darwin", "dev-mode", "ci-multi-config"]

{

"name": "ci-ubuntu",

"inherits": ["ci-build", "ci-linux", "clang-tidy", "cppcheck", "dev-mode"]

{

"name": "ci-windows",

"inherits": ["ci-build", "ci-win64", "dev-mode", "ci-multi-config"]

}

]

}

diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md

@@ -0,0 +1,5 @@

# Code of Conduct

* You will be judged by your contributions first, and your sense of humor

second.

* Nobody owes you anything.

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md

@@ -0,0 +1,19 @@

# Contributing

<!--

Short overview, rules, general guidelines, notes about pull requests and

style should go here.

-->

## Code of Conduct

Please see the [`CODE_OF_CONDUCT.md`](CODE_OF_CONDUCT.md) document.

## Getting started

Helpful notes for developers can be found in the [`HACKING.md`](HACKING.md)

document.

In addition to he above, if you use the presets file as instructed, then you

should NOT check it into source control, just as the CMake documentation

suggests.

diff --git a/HACKING.md b/HACKING.md

@@ -0,0 +1,170 @@

# Hacking

Here is some wisdom to help you build and test this project as a developer and

potential contributor.

If you plan to contribute, please read the [CONTRIBUTING](CONTRIBUTING.md)

guide.

## Developer mode

Build system targets that are only useful for developers of this project are

hidden if the `display_DEVELOPER_MODE` option is disabled. Enabling this

option makes tests and other developer targets and options available. Not

enabling this option means that you are a consumer of this project and thus you

have no need for these targets and options.

Developer mode is always set to on in CI workflows.

### Presets

This project makes use of [presets][1] to simplify the process of configuring

the project. As a developer, you are recommended to always have the [latest

CMake version][2] installed to make use of the latest Quality-of-Life

additions.

You have a few options to pass `display_DEVELOPER_MODE` to the configure

command, but this project prefers to use presets.

As a developer, you should create a `CMakeUserPresets.json` file at the root of

the project:

```json

{

"version": 2,

"cmakeMinimumRequired": {

"major": 3,

"minor": 14,

"patch": 0

"configurePresets": [

{

"name": "dev",

"binaryDir": "${sourceDir}/build/dev",

"inherits": ["dev-mode", "ci-<os>"],

"cacheVariables": {

"CMAKE_BUILD_TYPE": "Debug"

}

"buildPresets": [

{

"name": "dev",

"configurePreset": "dev",

"configuration": "Debug"

}

"testPresets": [

{

"name": "dev",

"configurePreset": "dev",

"configuration": "Debug",

"output": {

"outputOnFailure": true

}

]

}

```

You should replace `<os>` in your newly created presets file with the name of

the operating system you have, which may be `win64`, `linux` or `darwin`. You

can see what these correspond to in the

[`CMakePresets.json`](CMakePresets.json) file.

`CMakeUserPresets.json` is also the perfect place in which you can put all

sorts of things that you would otherwise want to pass to the configure command

in the terminal.

> **Note**

> Some editors are pretty greedy with how they open projects with presets.

> Some just randomly pick a preset and start configuring without your consent,

> which can be confusing. Make sure that your editor configures when you

> actually want it to, for example in CLion you have to make sure only the

> `dev-dev preset` has `Enable profile` ticked in

> `File > Settings... > Build, Execution, Deployment > CMake` and in Visual

> Studio you have to set the option `Never run configure step automatically`

> in `Tools > Options > CMake` **prior to opening the project**, after which

> you can manually configure using `Project > Configure Cache`.

### Configure, build and test

If you followed the above instructions, then you can configure, build and test

the project respectively with the following commands from the project root on

any operating system with any build system:

```sh

cmake --preset=dev

cmake --build --preset=dev

ctest --preset=dev

```

If you are using a compatible editor (e.g. VSCode) or IDE (e.g. CLion, VS), you

will also be able to select the above created user presets for automatic

integration.

Please note that both the build and test commands accept a `-j` flag to specify

the number of jobs to use, which should ideally be specified to the number of

threads your CPU has. You may also want to add that to your preset using the

`jobs` property, see the [presets documentation][1] for more details.

### Developer mode targets

These are targets you may invoke using the build command from above, with an

additional `-t <target>` flag:

#### `coverage`

Available if `ENABLE_COVERAGE` is enabled. This target processes the output of

the previously run tests when built with coverage configuration. The commands

this target runs can be found in the `COVERAGE_TRACE_COMMAND` and

`COVERAGE_HTML_COMMAND` cache variables. The trace command produces an info

file by default, which can be submitted to services with CI integration. The

HTML command uses the trace command's output to generate an HTML document to

`<binary-dir>/coverage_html` by default.

#### `docs`

Available if `BUILD_MCSS_DOCS` is enabled. Builds to documentation using

Doxygen and m.css. The output will go to `<binary-dir>/docs` by default

(customizable using `DOXYGEN_OUTPUT_DIRECTORY`).

#### `format-check` and `format-fix`

These targets run the clang-format tool on the codebase to check errors and to

fix them respectively. Customization available using the `FORMAT_PATTERNS` and

`FORMAT_COMMAND` cache variables.

#### `spell-check` and `spell-fix`

These targets run the codespell tool on the codebase to check errors and to fix

them respectively. Customization available using the `SPELL_COMMAND` cache

variable.

## Running tests on Windows with `BUILD_SHARED_LIBS=ON`

If you are building a shared library on Windows, you must add the path to the

DLL file to `PATH` when you want to run tests. One way you could do that is by

using PowerShell and writing a script for it, e.g. `env.ps1` at the project

root:

```powershell

$oldPrompt = (Get-Command prompt).ScriptBlock

function prompt() { "(Debug) $(& $oldPrompt)" }

$VsInstallPath = & "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe" -Property InstallationPath

$Env:Path += ";$VsInstallPath\Common7\IDE;$Pwd\build\dev\Debug"

```

Then you can source this script by running `. env.ps1`. This particular

example will only work for Debug builds.

### Passing `PATH` to editors

Make sure you launch your editor of choice from the console with the above

script sourced. Look for `(Debug)` in the prompt to confirm, then run e.g.

`code .` for VScode or `devenv .` for Visual Studio.

[1]: https://cmake.org/cmake/help/latest/manual/cmake-presets.7.html

[2]: https://cmake.org/download/

diff --git a/README.md b/README.md

@@ -0,0 +1,19 @@

# display

This is the display project.

# Building and installing

See the [BUILDING](BUILDING.md) document.

# Contributing

See the [CONTRIBUTING](CONTRIBUTING.md) document.

# Licensing

<!--

Please go to https://choosealicense.com/licenses/ and choose a license that

fits your needs. The recommended license for a project of this type is the

Boost Software License 1.0.

-->

diff --git a/cmake/coverage.cmake b/cmake/coverage.cmake

@@ -0,0 +1,33 @@

# ---- Variables ----

# We use variables separate from what CTest uses, because those have

# customization issues

set(

COVERAGE_TRACE_COMMAND

lcov -c -q

-o "${PROJECT_BINARY_DIR}/coverage.info"

-d "${PROJECT_BINARY_DIR}"

--include "${PROJECT_SOURCE_DIR}/*"

CACHE STRING

"; separated command to generate a trace for the 'coverage' target"

)

set(

COVERAGE_HTML_COMMAND

genhtml --legend -f -q

"${PROJECT_BINARY_DIR}/coverage.info"

-p "${PROJECT_SOURCE_DIR}"

-o "${PROJECT_BINARY_DIR}/coverage_html"

CACHE STRING

"; separated command to generate an HTML report for the 'coverage' target"

)

# ---- Coverage target ----

add_custom_target(

coverage

COMMAND ${COVERAGE_TRACE_COMMAND}

COMMAND ${COVERAGE_HTML_COMMAND}

COMMENT "Generating coverage report"

VERBATIM

)

diff --git a/cmake/dev-mode.cmake b/cmake/dev-mode.cmake

@@ -0,0 +1,11 @@

include(cmake/folders.cmake)

option(ENABLE_COVERAGE "Enable coverage support separate from CTest's" OFF)

if(ENABLE_COVERAGE)

include(cmake/coverage.cmake)

endif()

include(cmake/lint-targets.cmake)

include(cmake/spell-targets.cmake)

add_folders(Project)

diff --git a/cmake/folders.cmake b/cmake/folders.cmake

@@ -0,0 +1,21 @@

set_property(GLOBAL PROPERTY USE_FOLDERS YES)

# Call this function at the end of a directory scope to assign a folder to

# targets created in that directory. Utility targets will be assigned to the

# UtilityTargets folder, otherwise to the ${name}Targets folder. If a target

# already has a folder assigned, then that target will be skipped.

function(add_folders name)

get_property(targets DIRECTORY PROPERTY BUILDSYSTEM_TARGETS)

foreach(target IN LISTS targets)

get_property(folder TARGET "${target}" PROPERTY FOLDER)

if(DEFINED folder)

continue()

endif()

set(folder Utility)

get_property(type TARGET "${target}" PROPERTY TYPE)

if(NOT type STREQUAL "UTILITY")

set(folder "${name}")

endif()

set_property(TARGET "${target}" PROPERTY FOLDER "${folder}Targets")

endforeach()

endfunction()

diff --git a/cmake/install-config.cmake b/cmake/install-config.cmake

@@ -0,0 +1,1 @@

include("${CMAKE_CURRENT_LIST_DIR}/displayTargets.cmake")

diff --git a/cmake/install-rules.cmake b/cmake/install-rules.cmake

@@ -0,0 +1,72 @@

if(PROJECT_IS_TOP_LEVEL)

set(

CMAKE_INSTALL_INCLUDEDIR "include/display-${PROJECT_VERSION}"

CACHE STRING ""

)

set_property(CACHE CMAKE_INSTALL_INCLUDEDIR PROPERTY TYPE PATH)

endif()

include(CMakePackageConfigHelpers)

include(GNUInstallDirs)

# find_package(<package>) call for consumers to find this project

set(package display)

install(

diff --git a/cmake/lint-targets.cmake b/cmake/lint-targets.cmake

@@ -0,0 +1,33 @@

set(

FORMAT_PATTERNS

source/*.cpp source/*.hpp

include/*.hpp

test/*.cpp test/*.hpp

CACHE STRING

"; separated patterns relative to the project source dir to format"

)

set(FORMAT_COMMAND clang-format CACHE STRING "Formatter to use")

add_custom_target(

format-check

COMMAND "${CMAKE_COMMAND}"

-D "FORMAT_COMMAND=${FORMAT_COMMAND}"

-D "PATTERNS=${FORMAT_PATTERNS}"

-P "${PROJECT_SOURCE_DIR}/cmake/lint.cmake"

WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"

COMMENT "Linting the code"

VERBATIM

)

add_custom_target(

format-fix

COMMAND "${CMAKE_COMMAND}"

-D "FORMAT_COMMAND=${FORMAT_COMMAND}"

-D "PATTERNS=${FORMAT_PATTERNS}"

-D FIX=YES

-P "${PROJECT_SOURCE_DIR}/cmake/lint.cmake"

WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"

COMMENT "Fixing the code"

VERBATIM

)

diff --git a/cmake/lint.cmake b/cmake/lint.cmake

@@ -0,0 +1,51 @@

cmake_minimum_required(VERSION 3.14)

macro(default name)

if(NOT DEFINED "${name}")

set("${name}" "${ARGN}")

endif()

endmacro()

default(FORMAT_COMMAND clang-format)

default(

PATTERNS

source/*.cpp source/*.hpp

include/*.hpp

test/*.cpp test/*.hpp

)

default(FIX NO)

set(flag --output-replacements-xml)

set(args OUTPUT_VARIABLE output)

if(FIX)

set(flag -i)

set(args "")

endif()

file(GLOB_RECURSE files ${PATTERNS})

set(badly_formatted "")

set(output "")

string(LENGTH "${CMAKE_SOURCE_DIR}/" path_prefix_length)

foreach(file IN LISTS files)

execute_process(

COMMAND "${FORMAT_COMMAND}" --style=file "${flag}" "${file}"

WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"

RESULT_VARIABLE result

${args}

)

if(NOT result EQUAL "0")

message(FATAL_ERROR "'${file}': formatter returned with ${result}")

endif()

if(NOT FIX AND output MATCHES "\n<replacement offset")

string(SUBSTRING "${file}" "${path_prefix_length}" -1 relative_file)

list(APPEND badly_formatted "${relative_file}")

endif()

set(output "")

endforeach()

if(NOT badly_formatted STREQUAL "")

list(JOIN badly_formatted "\n" bad_list)

message("The following files are badly formatted:\n\n${bad_list}\n")

message(FATAL_ERROR "Run again with FIX=YES to fix these files.")

endif()

diff --git a/cmake/prelude.cmake b/cmake/prelude.cmake

@@ -0,0 +1,10 @@

# ---- In-source guard ----

if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)

message(

FATAL_ERROR

"In-source builds are not supported. "

"Please read the BUILDING document before trying to build this project. "

"You may need to delete 'CMakeCache.txt' and 'CMakeFiles/' first."

)

endif()

diff --git a/cmake/project-is-top-level.cmake b/cmake/project-is-top-level.cmake

@@ -0,0 +1,6 @@

# This variable is set by project() in CMake 3.21+

string(

COMPARE EQUAL

"${CMAKE_SOURCE_DIR}" "${PROJECT_SOURCE_DIR}"

PROJECT_IS_TOP_LEVEL

)

diff --git a/cmake/spell-targets.cmake b/cmake/spell-targets.cmake

@@ -0,0 +1,22 @@

set(SPELL_COMMAND codespell CACHE STRING "Spell checker to use")

add_custom_target(

spell-check

COMMAND "${CMAKE_COMMAND}"

-D "SPELL_COMMAND=${SPELL_COMMAND}"

-P "${PROJECT_SOURCE_DIR}/cmake/spell.cmake"

WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"

COMMENT "Checking spelling"

VERBATIM

)

add_custom_target(

spell-fix

COMMAND "${CMAKE_COMMAND}"

-D "SPELL_COMMAND=${SPELL_COMMAND}"

-D FIX=YES

-P "${PROJECT_SOURCE_DIR}/cmake/spell.cmake"

WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"

COMMENT "Fixing spelling errors"

VERBATIM

)

diff --git a/cmake/spell.cmake b/cmake/spell.cmake

@@ -0,0 +1,29 @@

cmake_minimum_required(VERSION 3.14)

macro(default name)

if(NOT DEFINED "${name}")

set("${name}" "${ARGN}")

endif()

endmacro()

default(SPELL_COMMAND codespell)

default(FIX NO)

set(flag "")

if(FIX)

set(flag -w)

endif()

execute_process(

COMMAND "${SPELL_COMMAND}" ${flag}

WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"

RESULT_VARIABLE result

)

if(result EQUAL "65")

message(FATAL_ERROR "Run again with FIX=YES to fix these errors.")

elseif(result EQUAL "64")

message(FATAL_ERROR "Spell checker printed the usage info. Bad arguments?")

elseif(NOT result EQUAL "0")

message(FATAL_ERROR "Spell checker returned with ${result}")

endif()

diff --git a/cmake/variables.cmake b/cmake/variables.cmake

@@ -0,0 +1,41 @@

# ---- Developer mode ----

# Developer mode enables targets and code paths in the CMake scripts that are

# only relevant for the developer(s) of display

# Targets necessary to build the project must be provided unconditionally, so

# consumers can trivially build and package the project

if(PROJECT_IS_TOP_LEVEL)

option(display_DEVELOPER_MODE "Enable developer mode" OFF)

option(BUILD_SHARED_LIBS "Build shared libs." OFF)

endif()

# ---- Suppress C4251 on Windows ----

# Please see include/display/display.hpp for more details

set(pragma_suppress_c4251 "

/* This needs to suppress only for MSVC */

#if defined(_MSC_VER) && !defined(__ICL)

# define DISPLAY_SUPPRESS_C4251 _Pragma(\"warning(suppress:4251)\")

#else

# define DISPLAY_SUPPRESS_C4251

#endif

# ---- Warning guard ----

# target_include_directories with the SYSTEM modifier will request the compiler

# to omit warnings from the provided paths, if the compiler supports that

# This is to provide a user experience similar to find_package when

# add_subdirectory or FetchContent is used to consume this project

set(warning_guard "")

if(NOT PROJECT_IS_TOP_LEVEL)

option(

display_INCLUDES_WITH_SYSTEM

"Use SYSTEM modifier for display's includes, disabling warnings"

)

mark_as_advanced(display_INCLUDES_WITH_SYSTEM)

if(display_INCLUDES_WITH_SYSTEM)

set(warning_guard SYSTEM)

endif()

diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt

@@ -0,0 +1,25 @@

cmake_minimum_required(VERSION 3.14)

project(displayExamples CXX)

include(../cmake/project-is-top-level.cmake)

include(../cmake/folders.cmake)

if(PROJECT_IS_TOP_LEVEL)

find_package(display REQUIRED)

endif()

add_custom_target(run-examples)

function(add_example NAME)

add_executable("${NAME}" "${NAME}.cpp")

target_link_libraries("${NAME}" PRIVATE display::display)

target_compile_features("${NAME}" PRIVATE cxx_std_20)

add_custom_target("run_${NAME}" COMMAND "${NAME}" VERBATIM)

add_dependencies("run_${NAME}" "${NAME}")

add_dependencies(run-examples "run_${NAME}")

endfunction()

add_example(example)

add_folders(Example)

diff --git a/example/example.cpp b/example/example.cpp

@@ -0,0 +1,3 @@

int main(void) {

return 0;

}

diff --git a/include/display/display.hpp b/include/display/display.hpp

@@ -0,0 +1,70 @@

#pragma once

#include <string>

#include "display/display_export.hpp"

/**

* A note about the MSVC warning C4251:

* This warning should be suppressed for private data members of the project's

* exported classes, because there are too many ways to work around it and all

* involve some kind of trade-off (increased code complexity requiring more

* developer time, writing boilerplate code, longer compile times), but those

* solutions are very situational and solve things in slightly different ways,

* depending on the requirements of the project.

* That is to say, there is no general solution.

* What can be done instead is understand where issues could arise where this

* warning is spotting a legitimate bug. I will give the general description of

* this warning's cause and break it down to make it trivial to understand.

* C4251 is emitted when an exported class has a non-static data member of a

* non-exported class type.

* The exported class in our case is the class below (exported_class), which

* has a non-static data member (m_name) of a non-exported class type

* (std::string).

* The rationale here is that the user of the exported class could attempt to

* access (directly, or via an inline member function) a static data member or

* a non-inline member function of the data member, resulting in a linker

* error.

* Inline member function above means member functions that are defined (not

* declared) in the class definition.

* Since this exported class never makes these non-exported types available to

* the user, we can safely ignore this warning. It's fine if there are

* non-exported class types as private member variables, because they are only

* accessed by the members of the exported class itself.

* The name() method below returns a pointer to the stored null-terminated

* string as a fundamental type (char const), so this is safe to use anywhere.

* The only downside is that you can have dangling pointers if the pointer

* outlives the class instance which stored the string.

* Shared libraries are not easy, they need some discipline to get right, but

* they also solve some other problems that make them worth the time invested.

/**

* @brief Reports the name of the library

* Please see the note above for considerations when creating shared libraries.

class DISPLAY_EXPORT exported_class

{

public:

/**

* @brief Initializes the name field to the name of the project

exported_class();

/**

* @brief Returns a non-owning pointer to the string stored in this class

auto name() const -> char const*;

private:

DISPLAY_SUPPRESS_C4251

std::string m_name;

};

diff --git a/source/display.cpp b/source/display.cpp

@@ -0,0 +1,13 @@

#include <string>

#include "display/display.hpp"

exported_class::exported_class()

: m_name {"display"}

{

}

auto exported_class::name() const -> char const*

{

return m_name.c_str();

}