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The "-l" flag of "guix environment" doesn't take a manifest; it takes
a file that evaluates to a package or a list of packages.
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snakemake-build-targets needs to set default-directory to the
Snakefile directory so that snakemake-term-process correctly reports
whether there is an active terminal when the user initiates the call
from a subdirectory.
Conceptually, it also makes sense to handle the directory change in
snakemake-build-targets. The docstrings for the lower-level
snakemake-compile-targets and snakemake-term-build-targets specify
that they correspond to a "snakemake ..." call, which implies that
their caller is responsible for making sure they are called from the
Snakefile directory.
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Snakemake commands are currently executed through compile. In
general, this works fine, but it doesn't work well when Snakemake
should be executed in a different environment than the one in which
the current Emacs session was started. For example, Guix commands
like 'guix environment ...' manipulate environmental variables to
expose particular software. With the current setup, snakemake-program
could be set to a wrapper script that creates the environment and then
calls Snakemake:
guix environment -l manifest.scm --ad-hoc snakemake --pure \
-- snakemake $@
But the disadvantage of this approach is that it adds the
environmental setup time to _each_ Snakemake call.
To work better with tools like Guix, let's add an alternative
interface that allows commands to be executed in a terminal session.
Instead of the above script, snakemake-shell-file-name can be set to a
script with
guix environment -l manifest.scm --ad-hoc snakemake --pure
Now the environmental setup cost is limited to starting the terminal.
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Make the name and popup description more general so that they still
apply when the terminal interface is added.
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This is in preparation for the addition of a terminal interface. No
code change is intended.
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This is in preparation for the addition of a terminal interface, at
which point this function will be used beyond the compilation
interface.
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snakemake-compile-targets already takes care of setting
default-directory to the Snakefile directory.
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Initially (7374840), snakemake-check-target only used regular
expressions to detect invalid targets based on the presence of a
MissingRuleException or RuleException in Snakemake's output. The target
was assumed to be valid if these exceptions weren't found. If there was
a non-zero exit status for another reason, it bubbled up to the compile
call where it was visible to the user.
33a7c90 (snakemake-check-target: Adjust for upstream output, 2016-09-01)
restricted the invalid target check to calls with an exit status of
zero. This makes the regular expression check useless because snakemake
should always exit with a non-zero status if a MissingRuleException or
RuleException is thrown. Due to this change, snakemake-check-target
classified all non-zero exits as invalid and all zero exits as valid.
While this often gives the right answer, it doesn't in cases where the
non-zero exit is unrelated to an invalid target.
2bceb7f (snakemake-check-target: Recognize protected items, 2016-09-05)
addressed one case.
To deal with other cases (such as an ambiguous rule error or a syntax
error in the Snakefile), use the following approach.
* An exit status of zero indicates a valid target.
* A non-zero exit status indicates an invalid target if
snakemake-all-rules has an exit status of zero. Otherwise,
snakemake-all-rules will signal an error and display the Snakemake
output.
The main downside of this approach is the need to call snakemake twice.
The output of snakmake-all-rules is cached, so this is only the case on
the first call to snakemake-check-target for a given version of a
Snakefile.
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With 33a7c90 (snakemake-check-target: Adjust for upstream output,
2016-09-01), write-protected targets were no longer considered valid
targets.
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As of Snakemake v3.8.0, using a wildcard rule name signals a key error:
Traceback (most recent call last):
File "/usr/lib/python3.5/site-packages/snakemake/io.py", line 401, in format_match
value = wildcards[name]
KeyError: 'name'
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The approach from 7b210fc (Ignore standard error stream when digesting
output, 2016-09-01) does not work well because, depending on the
snakemake subcommand, the text of interest may be in the stderr stream.
Instead, use lines with spaces as a way to detect non-target lines.
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Avoid including warnings as targets.
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Include name and block type.
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With introduction of snakemake-graph-this-file, this variable isn't
restricted to rule names.
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Re: #9
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Re: #9
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snakemake-file-targets-at-point expects to be called from the original
directory.
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