l10n: introduce framework for localizing man pages

Providing git in localized version is a good step for general
adoption of the tool. But as of now, if one needs to refer to the
manual pages, they are still confronted to english. The aim is to
provide documentation to users in their own language.

The translation of the source asciidoc files is managed via po4a
driven by the conf file Documentation/po4a.conf.

Only the manpages are generated and installed by using the
`install-man-l10n` target of the Makefile. The localized manpages
for all the translated languages are installed in the man path in
their own language folder, so that they can be accessed by man.

Signed-off-by: Jean-Noel Avila <[email protected]>

Author: jnavila

Documentation/Makefile

@@ -1,4 +1,5 @@
 # Guard against environment variables
+MAN1_L10N_TXT =
 MAN1_TXT =
 MAN5_TXT =
 MAN7_TXT =
@@ -10,6 +11,7 @@ OBSOLETE_HTML =
 MAN1_TXT += $(filter-out \
 		$(addsuffix .txt, $(ARTICLES) $(SP_ARTICLES)), \
 		$(wildcard git-*.txt))
+MAN1_L10N_TXT += $(wildcard po/*/man1/git-*.txt)
 MAN1_TXT += git.txt
 MAN1_TXT += gitk.txt
 MAN1_TXT += gitremote-helpers.txt
@@ -86,6 +88,7 @@ DOC_HTML += $(patsubst %,%.html,$(ARTICLES) $(SP_ARTICLES))
 DOC_MAN1 = $(patsubst %.txt,%.1,$(MAN1_TXT))
 DOC_MAN5 = $(patsubst %.txt,%.5,$(MAN5_TXT))
 DOC_MAN7 = $(patsubst %.txt,%.7,$(MAN7_TXT))
+DOC_MAN1_L10N = $(patsubst %.txt,%.1,$(MAN1_L10N_TXT))
 
 prefix ?= $(HOME)
 bindir ?= $(prefix)/bin
@@ -209,6 +212,7 @@ endif
 
 ifneq ($(findstring $(MAKEFLAGS),s),s)
 ifndef V
+	QUIET_PO4A      = @echo '   ' PO4A $@;
 	QUIET_ASCIIDOC	= @echo '   ' ASCIIDOC $@;
 	QUIET_XMLTO	= @echo '   ' XMLTO $@;
 	QUIET_DB2TEXI	= @echo '   ' DB2TEXI $@;
@@ -234,6 +238,15 @@ man1: $(DOC_MAN1)
 man5: $(DOC_MAN5)
 man7: $(DOC_MAN7)
 
+man_l10n: po4a man1_p_l10n
+po4a: po4a.conf
+	$(QUIET_PO4A)po4a po4a.conf
+
+man1_p_l10n: po4a
+	$(MAKE) man1_l10n
+
+man1_l10n: $(DOC_MAN1_L10N)
+
 info: git.info gitman.info
 
 pdf: user-manual.pdf
@@ -247,6 +260,11 @@ install-man: man
 	$(INSTALL) -m 644 $(DOC_MAN1) $(DESTDIR)$(man1dir)
 	$(INSTALL) -m 644 $(DOC_MAN5) $(DESTDIR)$(man5dir)
 	$(INSTALL) -m 644 $(DOC_MAN7) $(DESTDIR)$(man7dir)
+	$(MAKE) install-man-l10n
+
+install-man-l10n: $(DOC_MAN1_L10N)
+	$(INSTALL) -d -m 755 $(DESTDIR)$(mandir)/$(firstword $(subst /man1/, ,$(subst po/,,$<)))/man1
+	$(INSTALL) -m 644 $< $(DESTDIR)$(mandir)$(subst po,,$<)
 
 install-info: info
 	$(INSTALL) -d -m 755 $(DESTDIR)$(infodir)
@@ -323,6 +341,7 @@ clean:
 	$(RM) technical/*.html technical/api-index.txt
 	$(RM) $(cmds_txt) $(mergetools_txt) *.made
 	$(RM) manpage-base-url.xsl
+	$(RM) po/*/*.1 po/*/*.txt
 
 $(MAN_HTML): %.html : %.txt asciidoc.conf
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
@@ -339,7 +358,7 @@ manpage-base-url.xsl: manpage-base-url.xsl.in
 
 %.1 %.5 %.7 : %.xml manpage-base-url.xsl
 	$(QUIET_XMLTO)$(RM) $@ && \
-	$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
+	$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) -o $(dir $<) man $<
 
 %.xml : %.txt asciidoc.conf
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \

Documentation/po4a.conf

@@ -0,0 +1,5 @@
+[po4a_langs] fr
+[po4a_paths] po/documentation.pot $lang:po/documentation.$lang.po
+[options] opt: " -k 80"
+
+[type: asciidoc] ./git-add.txt $lang:./po/$lang/man1/git-add.txt