add a NixOS build script

README.md

@@ -44,6 +44,14 @@ Xpano [<input files>] [--output=<path>] [--gui] [--help] [--version]
 
 The project can be built by running a single script from the `misc/build` directory. You will need at least CMake 3.21, git and a compiler with C++20 support.
 
+### NixOS
+
+Run the build script from the root of the repository:
+
+```
+./misc/build/build-nixos.sh
+```
+
 ### MacOS
 
 Library prerequisites: SDL2, spdlog, catch2
@@ -52,7 +60,7 @@ Install with brew: `brew install sdl2 spdlog catch2`
 
 Install with macports: `sudo port install libsdl2 spdlog catch2` (for details: [#96](https://github.com/krupkat/xpano/pull/96#issuecomment-1575589249))
 
-Run the install script from the root of the repository:
+Run the build script from the root of the repository:
 
 ```
 ./misc/build/build-macos-12.sh
@@ -68,7 +76,7 @@ Library prerequisites:
 sudo apt install libgtk-3-dev libopencv-dev libsdl2-dev libspdlog-dev
 ```
 
-Run the install script from the root of the repository:
+Run the build script from the root of the repository:
 
 ```
 ./misc/build/build-ubuntu-22.sh
@@ -84,15 +92,15 @@ Library prerequisites:
 sudo apt install libgtk-3-dev
 ```
 
-Run the install script from the root of the repository:
+Run the build script from the root of the repository:
 
 ```
 ./misc/build/build-ubuntu-20.sh
 ```
 
 ### Windows
 
-Open the "Developer PowerShell for VS 2022" profile in Windows Terminal and run the install script from the root of the repository:
+Open the "Developer PowerShell for VS 2022" profile in Windows Terminal and run the build script from the root of the repository:
 
 ```
 ./misc/build/build-windows-latest.ps1

misc/build/build-nixos.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env nix-shell 
+#! nix-shell -i bash
+#! nix-shell -p git cmake ninja pkg-config gcc13 opencv SDL2 gtk3 catch2_3 spdlog 
+
+git submodule update --init
+
+export BUILD_TYPE='Release'
+export EXIV2_VERSION='v0.28.0'
+
+git clone https://github.com/Exiv2/exiv2.git --depth 1 --branch $EXIV2_VERSION
+cd exiv2
+cmake -B build -G Ninja \
+  -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
+  -DCMAKE_INSTALL_PREFIX=install \
+  `cat ../misc/build/exiv2-minimal-flags.txt`
+cmake --build build --target install
+cd ..
+
+cmake -B build -G Ninja \
+  -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
+  -DCMAKE_INSTALL_PREFIX=install \
+  -DBUILD_TESTING=ON \
+  -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
+  -Dexiv2_DIR=exiv2/install/lib64/cmake/exiv2
+
+cmake --build build --target install
+
+cd build
+ctest --output-on-failure
+cd ..