[PATCH 1/2] locale support in papersize definition

[Michal Vyskocil]

The papersize definition in groff_font(5) has been extended by new
keyword "locale". In this mode groff determine the paper size from
LC_PAPER variable.

The algorithm is simple - there is a small static list of countries
using letter based on territory language information page [1] (CLDR
2.0). If the LC_PAPER contains the country code (for instance _CL -
Chile), letter dimmensions are used. Otherwise a4.

[1] 
http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/territory_language_information.html
[2] http://wiki.services.openoffice.org/wiki/DefaultPaperSize
---
 src/include/paper.h         |    4 ++--
 src/libs/libgroff/paper.cpp |   42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/src/include/paper.h b/src/include/paper.h
index 73e070c..f5a8039 100644
--- a/src/include/paper.h
+++ b/src/include/paper.h
@@ -30,7 +30,7 @@ public:
   papersize_init();
 } _papersize_init;
 
-// A0-A7, B0-B7, C0-C7, D0-D7, 8 American paper sizes, 1 special size */
-#define NUM_PAPERSIZES 4*8 + 8 + 1
+// A0-A7, B0-B7, C0-C7, D0-D7, 8 American paper sizes, 1 special size and the 
locale */
+#define NUM_PAPERSIZES 4*8 + 8 + 1 + 1
 
 extern paper papersizes[];
diff --git a/src/libs/libgroff/paper.cpp b/src/libs/libgroff/paper.cpp
index 27a7c8c..42dea69 100644
--- a/src/libs/libgroff/paper.cpp
+++ b/src/libs/libgroff/paper.cpp
@@ -58,6 +58,46 @@ static void add_american_paper(const char *name, int idx,
   papersizes[idx].width = width;
 }
 
+static int is_letter(const char* variable) {
+
+    // CLDR 1.8.1 
http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/territory_la
+    // http://wiki.services.openoffice.org/wiki/DefaultPaperSize
+    #define COUNTRIES 13
+    static const char* countries[COUNTRIES] = {
+        "_BZ", "_CA", "CL", "CO", "CR", "GT", "MX", "NI", "PA", "PH", "PR", 
"SV", "US",
+    };
+
+    if (! variable) {
+        return 0;
+    }
+
+    for (int i = 0; i != COUNTRIES; i++) {
+        if (strstr(variable, countries[i])) {
+            return 1;
+        }
+    }
+
+    return 0;
+}
+
+static void add_locale_paper(int idx) {  
+    char * lc_paper;
+    double l = 297/25.4;
+    double w = 210/25.4;
+
+    //XXX: setlocale(LC_PAPER, NULL) does not work
+    //     at least on glibc 2.14
+    lc_paper = setlocale(LC_PAPER, "");
+
+    if (is_letter(lc_paper)) {
+        l = 11;
+        w = 8.5;
+    }
+    
+    add_american_paper("locale", idx, l, w);
+    
+}
+
 int papersize_init::initialised = 0;
 
 papersize_init::papersize_init()
@@ -80,4 +120,6 @@ papersize_init::papersize_init()
   add_american_paper("monarch", 39, 7.5, 3.875);
   // this is an ISO format, but it easier to use add_american_paper
   add_american_paper("dl", 40, 220/25.4, 110/25.4);
+  // the format from locale
+  add_locale_paper(41);
 }
-- 
1.7.6.3

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