1 files changed, 65 insertions, 0 deletions
diff --git a/%HOME%/.bash_utils/os.sh b/%HOME%/.bash_utils/os.sh
new file mode 100644
index 0000000..faada73
--- /dev/null
+++ b/%HOME%/.bash_utils/os.sh
@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+_os=''
+
+detect_os() {
+    command -v uname > /dev/null           \
+        && [ "$( uname -o )" == 'Cygwin' ] \
+        && _os='Cygwin'                    \
+        && return 0
+
+    [ -r /etc/os-release ]                              \
+        && _os="$( . /etc/os-release && echo "$NAME" )" \
+        && return 0
+
+    return 1
+}
+
+detect_os
+
+os_detected() {
+    test -n "$_os"
+}
+
+is_cygwin() {
+    test "$_os" == 'Cygwin'
+}
+
+is_ubuntu() {
+    test "$_os" == 'Ubuntu'
+}
+
+list_manually_installed_packages_ubuntu() (
+    set -o errexit -o nounset -o pipefail
+
+    comm -23 <( apt-mark showmanual | sort | uniq ) \
+        <( gzip --decompress --stdout -- /var/log/installer/initial-status.gz | sed --quiet 's/^Package: //p' | sort | uniq )
+)
+
+list_packages_cygwin() (
+    set -o errexit -o nounset -o pipefail
+
+    cygcheck --check-setup --dump-only \
+        | tail -n +3                   \
+        | cut -d ' ' -f 1
+)
+
+list_packages_ubuntu() (
+    set -o errexit -o nounset -o pipefail
+
+    dpkg --get-selections                     \
+        | grep --invert-match -- 'deinstall$' \
+        | cut -f 1                            \
+        | cut -d ':' -f 1
+)
+
+list_packages() (
+    set -o errexit -o nounset -o pipefail
+
+    if is_cygwin; then
+        list_packages_cygwin
+    elif is_ubuntu; then
+        list_packages_ubuntu
+    fi
+    return 1
+)