build: simplify code related to man pages

Simplify the main targets and use wildcards instead of repeating the
filenames manually.

Also, restore the `man` target and building only when `HAVE_MAN` is
enabled.

Note: Make automatically removes intermediate files (.1 and .5), so in
general only the .gz files have to be cleaned.

Commands used to rename the man pages:

    cd src/man
    git mv firecfg.txt firecfg.1.in
    git mv firejail-login.txt firejail-login.5.in
    git mv firejail-profile.txt firejail-profile.5.in
    git mv firejail-users.txt firejail-users.5.in
    git mv firejail.txt firejail.1.in
    git mv firemon.txt firemon.1.in
    git mv jailcheck.txt jailcheck.1.in

This is kind of a follow-up to commit 9e206b7f2 ("rework src/man
Makefile", 2023-07-07).

9 files changed, 25 insertions, 42 deletions

diff --git a/src/man/Makefile b/src/man/Makefile
index 1c0d94244..526ed7fcb 100644
--- a/src/man/Makefile
+++ b/src/man/Makefile
@@ -2,44 +2,25 @@
 ROOT = ../..
 -include $(ROOT)/config.mk
 
-all: firecfg.1.gz firejail.1.gz firejail-login.5.gz firejail-users.5.gz firejail-profile.5.gz firemon.1.gz jailcheck.1.gz
-
-#firecfg.1.gz: firecfg.txt
-#       gawk -f ./preproc.awk -- $(MANFLAGS) < $< > firecfg.1
-#       ./mkman.sh $(VERSION) firecfg.1
-#       gzip -n9 firecfg.1
-
-# a small function to build a manpage
-define build
-        gawk -f ./preproc.awk -- $(MANFLAGS) < $1 > $2
-        ./mkman.sh $(VERSION) ./$2
-        rm -f $2.gz
-        gzip -n9 $2
-endef
-
-firecfg.1.gz: firecfg.txt
-        $(call build,firecfg.txt,firecfg.1)
-
-firejail.1.gz: firejail.txt
-        $(call build,firejail.txt,firejail.1)
-
-firejail-login.5.gz: firejail-login.txt
-        $(call build,firejail-login.txt,firejail-login.5)
-
-firejail-users.5.gz: firejail-users.txt
-        $(call build,firejail-users.txt,firejail-users.5)
-
-firejail-profile.5.gz: firejail-profile.txt
-        $(call build,firejail-profile.txt,firejail-profile.5)
-
-firemon.1.gz: firemon.txt
-        $(call build,firemon.txt,firemon.1)
-
-jailcheck.1.gz: jailcheck.txt
-        $(call build,jailcheck.txt,jailcheck.1)
+MOD_DIR := $(ROOT)/src/man
+MANPAGES_IN := $(sort $(wildcard $(MOD_DIR)/*.in))
+MANPAGES_GZ := $(MANPAGES_IN:.in=.gz)
+TARGET = $(MANPAGES_GZ)
+
+.PHONY: all
+all: $(TARGET)
+
+# foo.1: foo.1.in
+$(MOD_DIR)/%: $(MOD_DIR)/%.in $(ROOT)/config.mk
+        @printf 'Generating %s from %s\n' $@ $<
+        @gawk -f $(MOD_DIR)/preproc.awk -- $(MANFLAGS) <$< | \
+          $(MOD_DIR)/mkman.sh $(VERSION) >$@
+
+# foo.1.gz: foo.1
+$(MOD_DIR)/%.gz: $(MOD_DIR)/%
+        @printf 'Generating %s from %s\n' $@ $<
+        @rm -f $@
+        @gzip -n9 $<
 
 .PHONY: clean
-clean:; rm -fr *.1 *.5 *.gz
-
-.PHONY: distclean
-distclean: clean
+clean:; rm -f *.1 *.5 *.gz
diff --git a/src/man/firecfg.txt b/src/man/firecfg.1.in
index 42add6a41..42add6a41 100644
--- a/src/man/firecfg.txt
+++ b/src/man/firecfg.1.in
diff --git a/src/man/firejail-login.txt b/src/man/firejail-login.5.in
index f03fc3c37..f03fc3c37 100644
--- a/src/man/firejail-login.txt
+++ b/src/man/firejail-login.5.in
diff --git a/src/man/firejail-profile.txt b/src/man/firejail-profile.5.in
index fa294d888..fa294d888 100644
--- a/src/man/firejail-profile.txt
+++ b/src/man/firejail-profile.5.in
diff --git a/src/man/firejail-users.txt b/src/man/firejail-users.5.in
index 7aa151680..7aa151680 100644
--- a/src/man/firejail-users.txt
+++ b/src/man/firejail-users.5.in
diff --git a/src/man/firejail.txt b/src/man/firejail.1.in
index 19fc94ebd..19fc94ebd 100644
--- a/src/man/firejail.txt
+++ b/src/man/firejail.1.in
diff --git a/src/man/firemon.txt b/src/man/firemon.1.in
index fb0cf1175..fb0cf1175 100644
--- a/src/man/firemon.txt
+++ b/src/man/firemon.1.in
diff --git a/src/man/jailcheck.txt b/src/man/jailcheck.1.in
index e889ea91b..e889ea91b 100644
--- a/src/man/jailcheck.txt
+++ b/src/man/jailcheck.1.in
diff --git a/src/man/mkman.sh b/src/man/mkman.sh
index b538b0126..0302e0778 100755
--- a/src/man/mkman.sh
+++ b/src/man/mkman.sh
@@ -5,8 +5,10 @@
 
 set -e
 
-sed -i "s/VERSION/$1/g" "$2"
 MONTH="$(LC_ALL=C date -u --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%b)"
-sed -i "s/MONTH/$MONTH/g" "$2"
 YEAR="$(LC_ALL=C date -u --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y)"
-sed -i "s/YEAR/$YEAR/g" "$2"
+
+sed \
+  -e "s/VERSION/$1/g" \
+  -e "s/MONTH/$MONTH/g" \
+  -e "s/YEAR/$YEAR/g"