如何在make中分割字符串? [英] How do I split a string in make?

问题描述

我需要在我的Makefile中使用一个参数，该参数由以下形式的主机标识符组成:

I need to take a parameter in my Makefile that consists of a host identifier in the form

host[:port]

其中冒号和端口是可选的.因此，以下所有条件均有效:

where the colon and port are optional. So all of the following are valid:

foo.example.com
ssl.example.com:443
localhost:5000

等

我想在可选冒号上分割字符串并将值分配给变量，以便HOST包含foo.example.com，ssl.example.com，localhost等，而PORT包含80(默认值端口)，443和500.

I want to split the string on the optional colon and assign the values to variables, so that HOST contains foo.example.com, ssl.example.com, localhost, etc., and PORT contains 80 (the default port), 443, and 500 respectively.

推荐答案

# Retrieves a host part of the given string (without port).
# Param:
#   1. String to parse in form 'host[:port]'.
host = $(firstword $(subst :, ,$1))

# Returns a port (if any).
# If there is no port part in the string, returns the second argument
# (if specified).
# Param:
#   1. String to parse in form 'host[:port]'.
#   2. (optional) Fallback value.
port = $(or $(word 2,$(subst :, ,$1)),$(value 2))

用法:

$(call host,foo.example.com) # foo.example.com
$(call port,foo.example.com,80) # 80

$(call host,ssl.example.com:443) # ssl.example.com
$(call port,ssl.example.com:443,80) # 443

这篇关于如何在make中分割字符串?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！