| @@ -1,11 +1,35 @@ | | | @@ -1,11 +1,35 @@ |
| 1 | # $NetBSD: varmod-shell.mk,v 1.3 2020/11/15 20:20:58 rillig Exp $ | | 1 | # $NetBSD: varmod-shell.mk,v 1.4 2020/11/17 20:08:09 rillig Exp $ |
| 2 | # | | 2 | # |
| 3 | # Tests for the :sh variable modifier, which runs the shell command | | 3 | # Tests for the :sh variable modifier, which runs the shell command |
| 4 | # given by the variable value and returns its output. | | 4 | # given by the variable value and returns its output. |
| 5 | # | | 5 | # |
| 6 | # TODO: Since when is this modifier available? | | 6 | # This modifier has been added on 2000-04-29. |
| | | 7 | # |
| | | 8 | # See also: |
| | | 9 | # ApplyModifier_ShellCommand |
| 7 | | | 10 | |
| 8 | # TODO: Implementation | | 11 | # TODO: Implementation |
| 9 | | | 12 | |
| | | 13 | # The command to be run is enclosed between exclamation marks. |
| | | 14 | # The previous value of the expression is irrelevant for this modifier. |
| | | 15 | # The :!cmd! modifier turns an undefined expression into a defined one. |
| | | 16 | .if ${:!echo word!} != "word" |
| | | 17 | . error |
| | | 18 | .endif |
| | | 19 | |
| | | 20 | # If the command exits with non-zero, an error message is printed. |
| | | 21 | # XXX: Processing continues as usual though. |
| | | 22 | # |
| | | 23 | # Since 2000-04-29, the error message mentions the previous |
| | | 24 | # value of the expression (which is usually an empty string) instead of the |
| | | 25 | # command that was executed. It's strange that such a simple bug could |
| | | 26 | # survive such a long time. |
| | | 27 | .if ${:!echo word; false!} != "word" |
| | | 28 | . error |
| | | 29 | .endif |
| | | 30 | .if ${:Uprevious value:!echo word; false!} != "word" |
| | | 31 | . error |
| | | 32 | .endif |
| | | 33 | |
| 10 | all: | | 34 | all: |
| 11 | @:; | | 35 | @:; |