Start to work on diff saving capabilities.

po/POTFILES.in

@@ -3556,6 +3556,8 @@ src/debris.h
 src/debug.c
 src/debug.h
 src/debug_fpu.c
+src/dev_diff.c
+src/dev_diff.h
 src/dev_mapedit.c
 src/dev_mapedit.h
 src/dev_spob.c

src/dev_diff.c

@@ -0,0 +1,55 @@
+/*
+ * See Licensing and Copyright notice in naev.h
+ */
+/**
+ * @file dev_diff.c
+ *
+ * @brief Handles saving unidiffs.
+ */
+
+#include "dev_diff.h"
+
+#include "array.h"
+#include "nxml.h"
+
+int ddiff_save( UniHunk_t *diffs, const char *filename )
+{
+   xmlDocPtr        doc;
+   xmlTextWriterPtr writer;
+   int              ret = 0;
+
+   /* Create the writer. */
+   writer = xmlNewTextWriterDoc( &doc, 0 );
+   if ( writer == NULL ) {
+      WARN( _( "testXmlwriterDoc: Error creating the xml writer" ) );
+      return -1;
+   }
+
+   /* Set the writer parameters. */
+   xmlw_setParams( writer );
+
+   /* Start writer. */
+   xmlw_start( writer );
+   xmlw_startElem( writer, "unidiff" );
+
+   /* Write the bulk of the diff. */
+   for ( int i = 0; i < array_size( diffs ); i++ ) {
+   }
+
+   xmlw_endElem( writer ); /* "unidiff" */
+   xmlw_done( writer );
+
+   /* No need for writer anymore. */
+   xmlFreeTextWriter( writer );
+
+   /* Write data. */
+   if ( xmlSaveFileEnc( filename, doc, "UTF-8" ) < 0 ) {
+      WARN( "Failed to write '%s'!", filename );
+      ret = -1;
+   }
+
+   /* Clean up. */
+   xmlFreeDoc( doc );
+
+   return ret;
+}

src/dev_diff.h

@@ -0,0 +1,8 @@
+/*
+ * See Licensing and Copyright notice in naev.h
+ */
+#pragma once
+
+#include "unidiff.h"
+
+int ddiff_save( UniHunk_t *diffs, const char *filename );

src/dev_uniedit.c

@@ -16,6 +16,7 @@
 
 #include "array.h"
 #include "conf.h"
+#include "dev_diff.h"
 #include "dev_spob.h"
 #include "dev_sysedit.h"
 #include "dev_system.h"
@@ -77,9 +78,10 @@ typedef enum UniEditViewMode_ {
 
 extern StarSystem *systems_stack;
 
-int                    uniedit_diffMode = 0;
-static UniHunk_t      *uniedit_diff     = NULL;
-static UniEditMode     uniedit_mode     = UNIEDIT_DEFAULT; /**< Editor mode. */
+int                    uniedit_diffMode  = 0;
+int                    uniedit_diffSaved = 0;
+static UniHunk_t      *uniedit_diff      = NULL;
+static UniEditMode     uniedit_mode      = UNIEDIT_DEFAULT; /**< Editor mode. */
 static UniEditViewMode uniedit_viewmode =
    UNIEDIT_VIEW_DEFAULT;              /**< Editor view mode. */
 static int uniedit_view_faction = -1; /**< Faction currently being viewed. */
@@ -201,7 +203,8 @@ void uniedit_open( unsigned int wid_unused, const char *unused )
 
    /* Must have no diffs applied. */
    diff_clear();
-   uniedit_diff = array_create( UniHunk_t );
+   uniedit_diff      = array_create( UniHunk_t );
+   uniedit_diffSaved = 1; /* Start OK with empty diffs. */
 
    /* Reset some variables. */
    uniedit_mode         = UNIEDIT_DEFAULT;
@@ -368,6 +371,15 @@ static int uniedit_keys( unsigned int wid, SDL_Keycode key, SDL_Keymod mod,
  */
 static void uniedit_close( unsigned int wid, const char *wgt )
 {
+   if ( uniedit_diffMode && !uniedit_diffSaved ) {
+      if ( !dialogue_YesNoRaw(
+              _( "#rUnsaved Progress" ),
+              _( "You have #runsaved changes#0 to the universe diff. Are you "
+                 "sure you wish to close the editor and #rlose all your "
+                 "changes#0?" ) ) )
+         return;
+   }
+
    uniedit_diffClear();
 
    /* Frees some memory. */
@@ -391,8 +403,13 @@ static void uniedit_save( unsigned int wid_unused, const char *unused )
    (void)wid_unused;
    (void)unused;
 
-   dsys_saveAll();
-   dpl_saveAll();
+   if ( uniedit_diffMode ) {
+      ddiff_save( uniedit_diff, "test.xml" );
+      uniedit_diffSaved = 1;
+   } else {
+      dsys_saveAll();
+      dpl_saveAll();
+   }
 }
 
 /*
@@ -2684,6 +2701,7 @@ static void uniedit_diffClear( void )
 
 void uniedit_diffAdd( UniHunk_t *hunk )
 {
+   uniedit_diffSaved = 0; /* Unsaved progress. */
    diff_start();
 
    /* Replace if already same type exists. */

src/meson.build

@@ -20,6 +20,7 @@ source = files(
    'debris.c',
    'debug.c',
    'debug_fpu.c',
+   'dev_diff.c',
    'dev_mapedit.c',
    'dev_spob.c',
    'dev_sysedit.c',
@@ -222,6 +223,7 @@ headers = files(
    'damagetype.h',
    'debris.h',
    'debug.h',
+   'dev_diff.h',
    'dev_mapedit.h',
    'dev_spob.h',
    'dev_sysedit.h',