git-gui: Quiet our installation process

Alex Riesen wanted a quieter installation process for git and its
contained git-gui.  His earlier patch to do this failed to work
properly when V=1, and didn't really give a great indication of
what the installation was doing.

These rules are a little bit on the messy side, as each of our
install actions is composed of at least two variables, but in the
V=1 case the text is identical to what we had before, while in the
non-V=1 case we use some more complex rules to show the interesting
details, and hide the less interesting bits.

We now can also set QUIET= (nothing) to see the rules that are used
when V= (nothing), so we can debug those too if we have to.  This is
actually a side-effect of how we insert the @ into the rules we use
for the "lists of things", like our builtins or our library files.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Makefile

@@ -29,11 +29,35 @@ ifndef INSTALL
 	INSTALL = install
 endif
 
+INSTALL_D0 = $(INSTALL) -d -m755 # space is required here
+INSTALL_D1 =
+INSTALL_R0 = $(INSTALL) -m644 # space is required here
+INSTALL_R1 =
+INSTALL_X0 = $(INSTALL) -m755 # space is required here
+INSTALL_X1 =
+INSTALL_L0 = rm -f # space is required here
+INSTALL_L1 = && ln # space is required here
+INSTALL_L2 =
+INSTALL_L3 =
+
 ifndef V
-	QUIET_GEN      = @echo '   ' GEN $@;
-	QUIET_BUILT_IN = @echo '   ' BUILTIN $@;
-	QUIET_INDEX    = @echo '   ' INDEX $(dir $@);
+	QUIET          = @
+	QUIET_GEN      = $(QUIET)echo '   ' GEN $@ &&
+	QUIET_BUILT_IN = $(QUIET)echo '   ' BUILTIN $@ &&
+	QUIET_INDEX    = $(QUIET)echo '   ' INDEX $(dir $@) &&
 	QUIET_2DEVNULL = 2>/dev/null
+
+	INSTALL_D0 = dir=
+	INSTALL_D1 = && echo ' ' DEST $$dir && $(INSTALL) -d -m755 "$$dir"
+	INSTALL_R0 = src=
+	INSTALL_R1 = && echo '   ' INSTALL 644 `basename $$src` && $(INSTALL) -m644 $$src
+	INSTALL_X0 = src=
+	INSTALL_X1 = && echo '   ' INSTALL 755 `basename $$src` && $(INSTALL) -m755 $$src
+
+	INSTALL_L0 = dst=
+	INSTALL_L1 = && src=
+	INSTALL_L2 = && dst=
+	INSTALL_L3 = && echo '   ' 'LINK       ' `basename "$$dst"` '->' `basename "$$src"` && rm -f "$$dst" && ln "$$src" "$$dst"
 endif
 
 TCL_PATH   ?= tclsh
@@ -109,12 +133,12 @@ GIT-GUI-VARS: .FORCE-GIT-GUI-VARS
 all:: $(ALL_PROGRAMS) lib/tclIndex
 
 install: all
-	$(INSTALL) -d -m755 '$(DESTDIR_SQ)$(gitexecdir_SQ)'
-	$(INSTALL) git-gui '$(DESTDIR_SQ)$(gitexecdir_SQ)'
-	$(foreach p,$(GITGUI_BUILT_INS), rm -f '$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' && ln '$(DESTDIR_SQ)$(gitexecdir_SQ)/git-gui' '$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' ;)
-	$(INSTALL) -d -m755 '$(DESTDIR_SQ)$(libdir_SQ)'
-	$(INSTALL) -m644 lib/tclIndex '$(DESTDIR_SQ)$(libdir_SQ)'
-	$(foreach p,$(ALL_LIBFILES), $(INSTALL) -m644 $p '$(DESTDIR_SQ)$(libdir_SQ)' ;)
+	$(QUIET)$(INSTALL_D0)'$(DESTDIR_SQ)$(gitexecdir_SQ)' $(INSTALL_D1)
+	$(QUIET)$(INSTALL_X0)git-gui $(INSTALL_X1) '$(DESTDIR_SQ)$(gitexecdir_SQ)'
+	$(QUIET)$(foreach p,$(GITGUI_BUILT_INS), $(INSTALL_L0)'$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' $(INSTALL_L1)'$(DESTDIR_SQ)$(gitexecdir_SQ)/git-gui' $(INSTALL_L2)'$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' $(INSTALL_L3) &&) true
+	$(QUIET)$(INSTALL_D0)'$(DESTDIR_SQ)$(libdir_SQ)' $(INSTALL_D1)
+	$(QUIET)$(INSTALL_R0)lib/tclIndex $(INSTALL_R1) '$(DESTDIR_SQ)$(libdir_SQ)'
+	$(QUIET)$(foreach p,$(ALL_LIBFILES), $(INSTALL_R0)$p $(INSTALL_R1) '$(DESTDIR_SQ)$(libdir_SQ)' &&) true
 
 dist-version:
 	@mkdir -p $(TARDIR)