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      1  1.11  rillig # $NetBSD: varmod-shell.mk,v 1.11 2024/08/29 20:20:37 rillig Exp $
      2   1.1  rillig #
      3   1.6  rillig # Tests for the ':!cmd!' variable modifier, which runs the shell command
      4   1.6  rillig # given by the variable modifier and returns its output.
      5   1.3  rillig #
      6   1.4  rillig # This modifier has been added on 2000-04-29.
      7   1.4  rillig #
      8   1.4  rillig # See also:
      9   1.4  rillig #	ApplyModifier_ShellCommand
     10   1.1  rillig 
     11   1.4  rillig # The command to be run is enclosed between exclamation marks.
     12   1.4  rillig # The previous value of the expression is irrelevant for this modifier.
     13   1.4  rillig # The :!cmd! modifier turns an undefined expression into a defined one.
     14   1.4  rillig .if ${:!echo word!} != "word"
     15   1.4  rillig .  error
     16   1.4  rillig .endif
     17   1.4  rillig 
     18   1.4  rillig # If the command exits with non-zero, an error message is printed.
     19   1.4  rillig # XXX: Processing continues as usual though.
     20   1.4  rillig #
     21   1.5  rillig # Between 2000-04-29 and 2020-11-17, the error message mentioned the previous
     22   1.4  rillig # value of the expression (which is usually an empty string) instead of the
     23   1.7  rillig # command that was executed.
     24  1.11  rillig # expect+1: warning: Command "echo word; (exit 13)" exited with status 13
     25   1.9  rillig .if ${:!echo word; (exit 13)!} != "word"
     26   1.4  rillig .  error
     27   1.4  rillig .endif
     28  1.11  rillig # expect+1: warning: Command "echo word; (exit 13)" exited with status 13
     29   1.9  rillig .if ${:Uprevious value:!echo word; (exit 13)!} != "word"
     30   1.4  rillig .  error
     31   1.4  rillig .endif
     32   1.4  rillig 
     33   1.7  rillig 
     34   1.8  rillig .MAKEFLAGS: -dv			# to see the "Capturing" debug output
     35  1.11  rillig # expect+1: warning: Command "echo word; (exit 13)" exited with status 13
     36   1.9  rillig _:=	${:!echo word; ${:U(exit 13)}!}
     37   1.7  rillig .MAKEFLAGS: -d0
     38   1.7  rillig 
     39   1.8  rillig 
     40   1.1  rillig all:
     41