add update-alternatives shortcuts

2 files changed, 48 insertions, 0 deletions

diff --git a/%HOME%/.bash_utils/alternatives.sh b/%HOME%/.bash_utils/alternatives.sh
new file mode 100644
index 0000000..4a0565c
--- /dev/null
+++ b/%HOME%/.bash_utils/alternatives.sh
@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2018 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "Linux/Cygwin environment" project.
+# For details, see https://github.com/egor-tensin/linux-home.
+# Distributed under the MIT License.
+
+alias update-my-alternatives='update-alternatives --quiet --altdir ~/.local/etc/alternatives --admindir ~/.local/var/lib/alternatives'
+
+setup_alternatives_cc() (
+    set -o errexit -o nounset -o pipefail
+
+    gcc_cc="$(  command -v gcc 2> /dev/null )" || return 0
+    gcc_cxx="$( command -v g++ 2> /dev/null )" || return 0
+    clang_cc="$(  command -v clang   2> /dev/null )" || return 0
+    clang_cxx="$( command -v clang++ 2> /dev/null )" || return 0
+
+    mkdir -p -- ~/.local/bin
+
+    update-my-alternatives --remove-all cc || true
+    update-my-alternatives --install ~/.local/bin/cc cc "$clang_cc" 512 --slave ~/.local/bin/c++ c++ "$clang_cxx"
+    update-my-alternatives --install ~/.local/bin/cc cc "$gcc_cc"   256 --slave ~/.local/bin/c++ c++ "$gcc_cxx"
+)
+
+setup_alternatives() (
+    set -o errexit -o nounset -o pipefail
+
+    command -v update-alternatives > /dev/null 2>&1 || return 0
+    mkdir -p -- ~/.local/etc/alternatives ~/.local/var/lib/alternatives
+
+    setup_alternatives_cc
+)
+
+setup_alternatives
+
+alt_gcc() (
+    set -o errexit -o nounset -o pipefail
+    gcc_cc="$( command -v gcc 2> /dev/null )"
+    update-my-alternatives --set cc "$gcc_cc"
+)
+
+alt_clang() (
+    set -o errexit -o nounset -o pipefail
+    clang_cc="$( command -v clang 2> /dev/null )"
+    update-my-alternatives --set cc "$clang_cc"
+)
diff --git a/%HOME%/.bash_utils/os.sh b/%HOME%/.bash_utils/os.sh
index b063cbc..f5af0f6 100644
--- a/%HOME%/.bash_utils/os.sh
+++ b/%HOME%/.bash_utils/os.sh
@@ -43,6 +43,8 @@ os_is_mint()   { test "$_os" == "$_MINT"   ; }
 os_is_arch()   { test "$_os" == "$_ARCH" -o "$_os" == "$_ARCH_ARM" ; }
 os_is_fedora() { test "$_os" == "$_FEDORA" ; }
 
+os_is_debian_based() { os_is_ubuntu || os_is_mint ; }
+
 # Cygwin
 
 pkg_list_cygwin() (