ui-diff: Add link to ignore/show whitespace changes in diffs

Add a link to the "Diffstat" line to ignore/show whitespace changes in the
generated diff.

To support this, cgit_commit_link() and cgit_diff_link() has learned to
preserve the ctx.qry.ignorews variable.

Signed-off-by: Johan Herland <johan@herland.net>

2 files changed, 15 insertions, 0 deletions

diff --git a/ui-diff.c b/ui-diff.c
index 1656b77..0dcabe9 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -168,12 +168,17 @@ void cgit_print_diffstat(const unsigned char *old_sha1,
         cgit_self_link("more", NULL, NULL, &ctx);
         html("/");
         ctx.qry.context = (save_context > 3 ? save_context : 3) >> 1;
         cgit_self_link("less", NULL, NULL, &ctx);
         ctx.qry.context = save_context;
         html(" context)");
+        html(" (");
+        ctx.qry.ignorews = (ctx.qry.ignorews + 1) % 2;
+        cgit_self_link(ctx.qry.ignorews ? "ignore" : "show", NULL, NULL, &ctx);
+        ctx.qry.ignorews = (ctx.qry.ignorews + 1) % 2;
+        html(" whitespace changes)");
         html("</div>");
         html("<table summary='diffstat' class='diffstat'>");
         max_changes = 0;
         cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, prefix,
                        ctx.qry.ignorews);
         for(i = 0; i<files; i++)
diff --git a/ui-shared.c b/ui-shared.c
index c99bcec..f46c935 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -346,12 +346,17 @@ void cgit_commit_link(char *name, const char *title, const char *class,
         if (ctx.qry.context > 0 && ctx.qry.context != 3) {
                 html(delim);
                 html("context=");
                 htmlf("%d", ctx.qry.context);
                 delim = "&amp;";
         }
+        if (ctx.qry.ignorews) {
+                html(delim);
+                html("ignorews=1");
+                delim = "&amp;";
+        }
         html("'>");
         html_txt(name);
         html("</a>");
 }
 
 void cgit_refs_link(const char *name, const char *title, const char *class,
@@ -394,12 +399,17 @@ void cgit_diff_link(const char *name, const char *title, const char *class,
         if (ctx.qry.context > 0 && ctx.qry.context != 3) {
                 html(delim);
                 html("context=");
                 htmlf("%d", ctx.qry.context);
                 delim = "&amp;";
         }
+        if (ctx.qry.ignorews) {
+                html(delim);
+                html("ignorews=1");
+                delim = "&amp;";
+        }
         html("'>");
         html_txt(name);
         html("</a>");
 }
 
 void cgit_patch_link(const char *name, const char *title, const char *class,