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34 lines
1.3 KiB
34 lines
1.3 KiB
--- |
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short-description: Running external commands |
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... |
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# External commands |
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As a part of the software configuration, you may want to get extra |
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data by running external commands. The basic syntax is the following. |
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```meson |
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r = run_command('command', 'arg1', 'arg2', 'arg3') |
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if r.returncode() != 0 |
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# it failed |
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endif |
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output = r.stdout().strip() |
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errortxt = r.stderr().strip() |
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``` |
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The `run_command` function returns an object that can be queried for |
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return value and text written to stdout and stderr. The `strip` method |
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call is used to strip trailing and leading whitespace from |
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strings. Usually output from command line programs ends in a newline, |
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which is unwanted in string variables. The first argument can be |
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either a string or an executable you have detected earlier with |
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`find_program`. |
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Note that you can not pass your command line as a single string. That |
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is, calling `run_command('do_something foo bar')` will not work. You |
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must either split up the string into separate arguments or pass the |
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split command as an array. It should also be noted that Meson will not |
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pass the command to the shell, so any command lines that try to use |
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things such as environment variables, backticks or pipelines will not |
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work. If you require shell semantics, write your command into a script |
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file and call that with `run_command`.
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