add path.sh

1 files changed, 45 insertions, 0 deletions

diff --git a/%HOME%/.bash_utils/path.sh b/%HOME%/.bash_utils/path.sh
new file mode 100644
index 0000000..322e802
--- /dev/null
+++ b/%HOME%/.bash_utils/path.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "Cygwin configuration files" project.
+# For details, see https://github.com/egor-tensin/cygwin-home.
+# Distributed under the MIT License.
+
+source "$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )/text.sh"
+
+add_missing_path() (
+    set -o errexit -o nounset -o pipefail
+
+    [ "$#" -eq 0 ] && return 0
+
+    local -a new_paths
+    local path
+
+    while IFS= read -d '' -r path; do
+        new_paths+=("$path")
+    done < <( readlink --zero --canonicalize-missing "$@" )
+
+    for path; do
+        if str_contains "$path" ':'; then
+            echo "${FUNCNAME[0]}: mustn't contain colons: $path" >&2
+            return 1
+        fi
+    done
+
+    local -A old_paths
+
+    while IFS= read -d '' -r path; do
+        old_paths[$path]=1
+    done < <( str_split -z -- "${PATH-}" ':' | xargs --null readlink --zero --canonicalize-missing )
+
+    for path in ${new_paths[@]+"${new_paths[@]}"}; do
+        old_paths[$path]=1
+    done
+
+    str_join ':' "${!old_paths[@]}"
+)
+
+add_path() {
+    PATH="$( add_missing_path "$@" )" || return $?
+    export PATH
+}