[Scripts] Add activate.sh

Signed-off-by: Wojtek Porczyk <[email protected]>

meson.build

@@ -311,3 +311,14 @@ if enable_libgomp
 endif
 
 run_target('clang-format', command: [meson_clang_format_prog])
+
+conf = configuration_data()
+conf.set('PATH', get_option('prefix') / get_option('bindir'))
+conf.set('LD_LIBRARY_PATH', get_option('prefix') / get_option('libdir'))
+conf.set('PKG_CONFIG_PATH', get_option('prefix') / get_option('libdir') / 'pkgconfig')
+conf.set('PYTHONPATH', python3_platlib)
+configure_file(
+    input: 'scripts/activate.sh.in',
+    output: 'activate.sh',
+    configuration: conf,
+)

scripts/activate.sh.in

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+set -xe
+
+case "@PATH@" in
+@*)
+    echo This script is intended for running from builddir after being templated by Meson. >&2
+    exit 1
+    ;;
+esac
+
+pathmunge() {
+    eval "var=\$$1"
+    case "$var" in *"$2"*) return;; esac
+    eval "$1=\$2\${$1:+:\$$1}"
+    eval "export $1"
+}
+
+pathmunge PATH "@PATH@"
+pathmunge LD_LIBRARY_PATH "@LD_LIBRARY_PATH@"
+pathmunge PKG_CONFIG_PATH "@PKG_CONFIG_PATH@"
+pathmunge PYTHONPATH "@PYTHONPATH@"
+
+exec $SHELL