Rename script.

1 files changed, 166 insertions, 0 deletions

diff --git a/rbpm.sh b/rbpm.sh
new file mode 100755
index 0000000..e452e52
--- /dev/null
+++ b/rbpm.sh
@@ -0,0 +1,166 @@
+#!/usr/bin/env bash
+#
+# Copyright 2014 David Vazgenovich Shakaryan
+# Distributed under the terms of the MIT License.
+#
+# rbpm (ruby path mangler)
+# https://github.com/omp/rbpm
+# Manage multiple Ruby installations with no black magic.
+#
+# In order to prevent environment pollution, the output of this script
+# is a list of commands which must be sourced. This can be achieved
+# through a simple shell function:
+#
+#     rbpm() { source <(/path/to/rbpm.sh "${@}"); }
+#
+# Placing the above function inside ~/.bashrc (or equivalent) will load
+# it upon starting your shell.
+
+: ${RUBIES_PATH:="${HOME}/.rubies"}
+
+_echo() {
+    echo "echo '${@//\'/\'\\\'\'}'"
+}
+
+_export() {
+    echo "export PATH='${PATH//\'/\'\\\'\'}'"
+    echo 'hash -r'
+}
+
+_warn() {
+    echo "echo 'rbpm: ${@//\'/\'\\\'\'}' 1>&2"
+}
+
+_die() {
+    [[ -n "${@}" ]] && _warn "${@}"
+
+    echo 'false'
+    exit 1
+}
+
+_populate_dirs() {
+    [[ -d "${RUBIES_PATH}" ]] \
+        || _die "directory ${RUBIES_PATH} does not exist."
+
+    # Cannot handle paths containing a newline. Only an idiot would
+    # encounter this in practice.
+    readarray -t dirs < <(shopt -s nullglob; \
+        printf '%s\0' "${RUBIES_PATH}"/* | sort -zV | xargs -0n1)
+
+    [[ -n "${dirs}" ]] || _die "directory ${RUBIES_PATH} is empty."
+}
+
+_populate_selected() {
+    local dir dirs
+
+    IFS=':' read -a dirs <<< "${PATH}"
+
+    for dir in "${dirs[@]}"; do
+        if [[ "${dir}" == "${RUBIES_PATH}/"* ]]; then
+            dir="${dir%/bin}"
+            selected+=("${dir##*/}")
+        fi
+    done
+
+    [[ "${#selected[@]}" -ne 0 ]] || return 1
+    [[ "${#selected[@]}" -eq 1 ]] \
+        || _warn 'warning: multiple rubies found in PATH.'
+}
+
+_clear() {
+    local dir dirs cdirs
+
+    IFS=':' read -a dirs <<< "${PATH}"
+
+    for dir in "${dirs[@]}"; do
+        if [[ "${dir}" == "${RUBIES_PATH}/"* ]]; then
+            _echo "Removing ${dir} from PATH."
+        else
+            cdirs+=("${dir}")
+        fi
+    done
+
+    [[ "${#cdirs[@]}" -ne "${#dirs[@]}" ]] || return 1
+
+    PATH="$(IFS=':'; echo "${cdirs[*]}")"
+}
+
+_add() {
+    _echo "Adding ${1}/bin to PATH."
+
+    PATH="${1}/bin:${PATH}"
+}
+
+rbpm_ls() {
+    local dir dirs selected str
+
+    _populate_dirs
+    _populate_selected
+
+    for dir in "${dirs[@]}"; do
+        str="  ${dir##*/}"
+
+        [[ "${dir##*/}" == "${selected}" ]] && str="${str/ /*}"
+
+        _echo "${str}"
+    done
+}
+
+rbpm_get() {
+    local dir selected
+
+    _populate_selected || _die 'no rubies found in PATH.'
+
+    for dir in "${selected[@]}"; do
+        _echo "${dir}"
+    done
+}
+
+rbpm_set() {
+    [[ -n "${1}" ]] || _die 'set command requires an argument.'
+
+    local dir dirs match
+
+    _populate_dirs
+
+    for dir in "${dirs[@]}"; do
+        if [[ "${dir##*/}" == *"${1}"* ]]; then
+            match="${dir}"
+        fi
+    done
+
+    [[ -n "${match}" ]] || _die 'no matching ruby found.'
+
+    _clear
+    _add "${match}"
+    _export
+}
+
+rbpm_clear() {
+    _clear || _die 'no rubies found in PATH.'
+    _export
+}
+
+rbpm_help() {
+    _echo 'Usage: rbpm <command> [args]'
+    _echo
+    _echo 'Commands:'
+    _echo '  ls     List all available rubies.'
+    _echo '  get    Display currently selected ruby.'
+    _echo '  set    Select specified ruby.'
+    _echo '  clear  Clear path of any rubies.'
+    _echo '  help   Display this help information.'
+}
+
+case "${1}" in
+    'ls')
+        rbpm_ls ;;
+    'get')
+        rbpm_get ;;
+    'set')
+        rbpm_set "${2}" ;;
+    'clear')
+        rbpm_clear ;;
+    *)
+        rbpm_help ;;
+esac