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Update boilerplate to latest from bash-boilerplate.
Source: https://github.com/alphabetum/bash-boilerplate
This commit is contained in:
William Melody
parent
7f3f6a95ab
commit
79a5aa95fc
175
hosts
175
hosts
@ -68,11 +68,13 @@ export _TAB_SPACE_CC_="[${_TAB_SPACE_}]"
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# A simple function for executing a specified command if the `$_USE_DEBUG`
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# variable has been set. The command is expected to print a message and
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# should typically be either `echo`, `printf`, or `cat`.
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__DEBUG_COUNTER=0
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_debug() {
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if [[ "${_USE_DEBUG:-"0"}" -eq 1 ]]
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then
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then
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__DEBUG_COUNTER=$((__DEBUG_COUNTER+1))
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# Prefix debug message with "bug (U+1F41B)"
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printf "🐛 "
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printf "🐛 %s " "${__DEBUG_COUNTER}"
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"${@}"
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printf "――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――\\n"
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fi
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@ -366,8 +368,7 @@ _main() {
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_debug printf "main(): entering...\\n"
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_debug printf "main() \${_CMD} (upon entering): %s\\n" "${_CMD}"
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# If $_CMD is blank, then set to `$HOSTS_DEFAULT_COMMAND`
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if [[ -z ${_CMD} ]]
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if [[ -z "${_CMD}" ]]
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then
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_CMD="${HOSTS_DEFAULT_COMMAND}"
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fi
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@ -381,11 +382,7 @@ _main() {
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# Pass all comment arguments to the program except for the first ($0).
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${_CMD} "${_COMMAND_PARAMETERS[@]:-}"
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else
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local _parameters=()
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_parameters+=("${_CMD}")
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_parameters+=(${_COMMAND_PARAMETERS[@]:-})
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"${HOSTS_DEFAULT_COMMAND}" "${_parameters[@]:-}"
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_die printf "Unknown command: %s\\n" "${_CMD}"
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fi
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}
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@ -398,8 +395,12 @@ _main() {
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# Usage:
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# _function_exists "possible_function_name"
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#
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# Takes a potential function name as an argument and returns whether a function
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# exists with that name.
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# Returns:
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# 0 If a function with the given name is defined in the current environment.
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# 1 If not.
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#
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# Other implementations, some with better performance:
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# http://stackoverflow.com/q/85880
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_function_exists() {
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[ "$(type -t "${1}")" == 'function' ]
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}
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@ -409,10 +410,11 @@ _function_exists() {
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# Usage:
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# _command_exists "possible_command_name"
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#
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# Takes a potential command name as an argument and returns whether a command
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# exists with that name.
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# Returns:
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# 0 If a command with the given name is defined in the current environment.
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# 1 If not.
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#
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# For information on why `hash` is used here, see:
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# Information on why `hash` is used here:
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# http://stackoverflow.com/a/677212
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_command_exists() {
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hash "${1}" 2>/dev/null
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@ -423,14 +425,15 @@ _command_exists() {
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# Usage:
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# _contains "$item" "${list[*]}"
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#
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# Takes an item and a list and determines whether the list contains the item.
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# Returns:
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# 0 If the item is included in the list.
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# 1 If not.
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_contains() {
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local _test_list=(${*:2})
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for _test_element in "${_test_list[@]:-}"
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for __test_element in "${_test_list[@]:-}"
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do
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_debug printf "_contains() \${_test_element}: %s\\n" "${_test_element}"
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if [[ "${_test_element}" == "${1}" ]]
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_debug printf "_contains() \${__test_element}: %s\\n" "${__test_element}"
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if [[ "${__test_element}" == "${1}" ]]
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then
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_debug printf "_contains() match: %s\\n" "${1}"
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return 0
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@ -462,8 +465,10 @@ _join() {
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# Usage:
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# _command_argv_includes "an_argument"
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#
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# Takes a possible command argument and determines whether it is included in
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# the command argument list.
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# Returns:
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# 0 If the argument is included in `$_COMMAND_ARGV`, the program's command
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# argument list.
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# 1 If not.
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#
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# This is a shortcut for simple cases where a command wants to check for the
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# presence of options quickly without parsing the options again.
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@ -476,7 +481,9 @@ _command_argv_includes() {
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# Usage:
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# _blank "$an_argument"
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#
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# Takes an argument and returns true if it is blank.
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# Returns:
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# 0 If the argument is not present or null.
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# 1 If the argument is present and not null.
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_blank() {
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[[ -z "${1:-}" ]]
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}
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@ -486,11 +493,37 @@ _blank() {
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# Usage:
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# _present "$an_argument"
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#
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# Takes an argument and returns true if it is present.
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# Returns:
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# 0 If the argument is present and not null.
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# 1 If the argument is not present or null.
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_present() {
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[[ -n "${1:-}" ]]
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}
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# _interactive_input()
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#
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# Usage:
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# _interactive_input
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#
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# Returns:
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# 0 If the current input is interactive (eg, a shell).
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# 1 If the current input is stdin / piped input.
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_interactive_input() {
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[[ -t 0 ]]
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}
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# _piped_input()
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#
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# Usage:
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# _piped_input
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#
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# Returns:
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# 0 If the current input is stdin / piped input.
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# 1 If the current input is interactive (eg, a shell).
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_piped_input() {
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! _interactive_input
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}
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# _verify_write_permissions
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#
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# Print a helpful error message when the specified operation can't be
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@ -518,59 +551,65 @@ sudo !!\\n"
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# desc()
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#
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# Usage:
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# desc command "description"
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# desc <name> <description>
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# desc --get <name>
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#
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# Create a description for a specified command name. The command description
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# text can be passed as the second argument or as standard input.
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# Options:
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# --get Print the description for <name> if one has been set.
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#
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# To make the description text available to other functions, desc() assigns the
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# text to a variable with the format $_desc_function_name
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# Examples:
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# ```
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# desc "list" <<HEREDOC
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# Usage:
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# ${_ME} list
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#
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# NOTE:
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#
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# The `read` form of assignment is used for a balance of ease of
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# implementation and simplicity. There is an alternative assignment form
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# that could be used here:
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#
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# var="$(cat <<'HEREDOC'
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# some message
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# Description:
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# List items.
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# HEREDOC
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# )
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#
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# However, this form appears to require trailing space after backslases to
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# preserve newlines, which is unexpected. Using `read` simply requires
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# escaping backslashes, which is more common.
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# desc --get "list"
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# ```
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#
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# Set or print a description for a specified command or function <name>. The
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# <description> text can be passed as the second argument or as standard input.
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#
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# To make the <description> text available to other functions, `desc()` assigns
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# the text to a variable with the format `$___desc_<name>`.
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#
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# When the `--get` option is used, the description for <name> is printed, if
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# one has been set.
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desc() {
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set +e
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[[ -z ${1:-} ]] && _die printf "desc: No command name specified.\\n"
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if [[ -n ${2:-} ]]
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then
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read -r -d '' "_desc_${1}" <<HEREDOC
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_debug printf "desc() \${*}: %s\\n" "$@"
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[[ -z "${1:-}" ]] && _die printf "desc(): No command name specified.\\n"
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if [[ "${1}" == "--get" ]]
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then # get ------------------------------------------------------------------
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[[ -z "${2:-}" ]] && _die printf "desc(): No command name specified.\\n"
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local _name="${2:-}"
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local _desc_var="___desc_${_name}"
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if [[ -n "${!_desc_var:-}" ]]
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then
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printf "%s\\n" "${!_desc_var}"
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else
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printf "No additional information for \`%s\`\\n" "${_name}"
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fi
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else # set ------------------------------------------------------------------
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if [[ -n "${2:-}" ]]
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then # argument is present
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read -r -d '' "___desc_${1}" <<HEREDOC
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${2}
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HEREDOC
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_debug printf "desc() set with argument: _desc_%s\\n" "${1}"
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else
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read -r -d '' "_desc_${1}"
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_debug printf "desc() set with pipe: _desc_%s\\n" "${1}"
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fi
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set -e
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}
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# _print_desc()
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#
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# Usage:
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# _print_desc <command>
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#
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# Prints the description for a given command, provided the description has been
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# set using the desc() function.
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_print_desc() {
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local _var="_desc_${1:-}"
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_debug printf "desc() set with argument: \${___desc_%s}\\n" "${1}"
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else # no argument is present, so assume piped input
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# `read` exits with non-zero status when a delimeter is not found, so
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# avoid errors by ending statement with `|| true`.
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read -r -d '' "___desc_${1}" || true
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if [[ -n "${!_var:-}" ]]
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then
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printf "%s\\n" "${!_var}"
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else
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printf "No additional information for \`%s\`\\n" "${1}"
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_debug printf "desc() set with pipe: \${___desc_%s}\\n" "${1}"
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fi
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fi
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}
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@ -646,7 +685,7 @@ Help:
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$(commands)
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HEREDOC
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else
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_print_desc "${1}"
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desc --get "${1}"
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fi
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}
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@ -1246,5 +1285,5 @@ unblock() {
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# Run Program
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###############################################################################
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# Calling the _main function after everything has been defined.
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# Call the `_main` function after everything has been defined.
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_main
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