如何在sublime-build文件中指定$ HOME文件夹？

Question

I am using a custom build system in Sublime Text 3 for a C++ project. One of the lines looks like

"-I${HOME}/my_file/include"

The problem is that ${HOME} does not expand to the actual /home/user_x , but expands to an empty string '' . I cannot find any way of specifying the HOME folder elegantly, without the need to write the actual path. Is there a way of doing this? Ie, to expand the UNIX $HOME variable to the actual location of the home folder?

Answer 1

What you're running afoul of here is that the cmd , shell_cmd and working_dir arguments are all subject to variable expansion in build systems.

What's not outlined there is that anything of this format is treated as a variable when the expansion happens, and unknown variables are expanded to an empty string (ie no value).

As such, Sublime sees your ${HOME} and tries to expand it, which unhelpfully removes it's value from the string.

The easiest and least invasive way around this is to quote the $ character in the variable expansion so that Sublime will ignore it and pass it through, where the shell can expand it as appropriate:

{
    "shell_cmd": "echo Home is \\${HOME}"
}

or

{
    "cmd": "echo Home is \\${HOME}",
    "shell": true
}

Note that as seen in these examples you need to use either shell_cmd with a complete command string or cmd with a command string in combination with shell being set to true in order for this to work.

Note also that the quoting appears to be doubled because the build file is JSON. So when the build is loaded, \\\\${HOME} is internally seen by Sublime as \\${HOME} (ie it "eats" the first level of quoting), and the final quoting causes Sublime to treat the $ as a literal and not special so that it will be passed to the shell, which expands it itself.

Answer 2

You can try writing your commands to a shell script and running the script from Sublime. I'm not sure if Sublime supports this feature, but shell script should find and expand $HOME and any other variables.