help.mk, clean.mk: drop __frontend for tty test

The __frontend variable was introduced to address the needs of alterator-mkimage module: list the images available in one column, purge the builddir. Looks like we should consider other cases with redirected stdout (cron builds, piped calls, etc) like fundamentally non-interactive and behave the same. So commit 3a8af6b5's description is wrong now; the current cleanup rules are: - if CLEAN=0 or DEBUG>1, don't do it; - if CHECK or REPORT is set, don't do it; - otherwise if at least one of the following conditions is true: + there's more than one target being built in a row; + stdout was redirected (cronjob, alterator-mkimage...); + metaprofile directory is read-only ...then do a distclean. If that doesn't suit your needs, describe the particular situation please. Thanks cas@ for wondering aloud whether greppable output is unsupported with `make help'.

help.mk, clean.mk: drop __frontend for tty test
ec3d40cc · Michael Shigorin · 51cb7825 · ec3d40cc · ec3d40cc
Commit ec3d40cc authored Apr 02, 2015 by Michael Shigorin
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Showing with 6 additions and 8 deletions

clean.mk lib/clean.mk +1 -1

help.mk lib/help.mk +5 -7

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--- a/lib/clean.mk
+++ b/lib/clean.mk
@@ -58,7 +58,7 @@ postclean: build-image
 	   [ -z "$(CHECK)" ] && \
 	   [ -z "$(REPORT)" ] && \
 	   [ "$(NUM_TARGETS)" -gt 1 \
-	       -o -n "$(__frontend)" \
+	       -o ! -t 1 \
 	       -o ! -L "$(SYMLINK)" ]; \
 	then \
 		echo "$(TIME) cleaning up after build"; \

--- a/lib/help.mk
+++ b/lib/help.mk
 # this makefile holds the most helpful bits for the toplevel one
-ifdef __frontend
-define help_body
-	@for i in $(2); do echo $$i; done
-endef
-else
 define help_body
+if [ -t 1 ]; then \
 	echo '** available $(1) targets:'; \
-	columnize $(2)
+	columnize $(2); \
+else \
+	printf '%s\n' $(2); \
+fi
 endef
-endif
 help = $(and $(2),$(help_body))