Add URL parameter 'ignorews' for optionally ignoring whitespace in diffs

The new ctx.qry.ignorews variable is passed via cgit_diff_files() and
cgit_diff_tree() to Git's diff machinery. This is equivalent to passing
--ignore-all-space to 'git diff'.

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

6 files changed, 25 insertions, 12 deletions

diff --git a/cgit.c b/cgit.c
index e9bafb5..9452884 100644
--- a/cgit.c
+++ b/cgit.c
@@ -251,8 +251,10 @@ static void querystring_cb(const char *name, const char *value)
         } else if (!strcmp(name, "ss")) {
                 ctx.qry.ssdiff = atoi(value);
         } else if (!strcmp(name, "context")) {
                 ctx.qry.context = atoi(value);
+        } else if (!strcmp(name, "ignorews")) {
+                ctx.qry.ignorews = atoi(value);
         }
 }
 
 char *xstrdupn(const char *str)
diff --git a/cgit.h b/cgit.h
index bb8f598..1bdfbc6 100644
--- a/cgit.h
+++ b/cgit.h
@@ -145,8 +145,9 @@ struct cgit_query {
         char *sort;
         int showmsg;
         int ssdiff;
         int context;
+        int ignorews;
         char *vpath;
 };
 
 struct cgit_config {
@@ -274,13 +275,14 @@ extern void *cgit_free_commitinfo(struct commitinfo *info);
 
 extern int cgit_diff_files(const unsigned char *old_sha1,
                            const unsigned char *new_sha1,
                            unsigned long *old_size, unsigned long *new_size,
-                           int *binary, int context, linediff_fn fn);
+                           int *binary, int context, int ignorews,
+                           linediff_fn fn);
 
 extern void cgit_diff_tree(const unsigned char *old_sha1,
                            const unsigned char *new_sha1,
-                           filepair_fn fn, const char *prefix);
+                           filepair_fn fn, const char *prefix, int ignorews);
 
 extern void cgit_diff_commit(struct commit *commit, filepair_fn fn);
 
 extern char *fmt(const char *format,...);
diff --git a/shared.c b/shared.c
index 7cf1e59..d0973ab 100644
--- a/shared.c
+++ b/shared.c
@@ -262,9 +262,9 @@ int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 
 int cgit_diff_files(const unsigned char *old_sha1,
                     const unsigned char *new_sha1, unsigned long *old_size,
                     unsigned long *new_size, int *binary, int context,
-                    linediff_fn fn)
+                    int ignorews, linediff_fn fn)
 {
         mmfile_t file1, file2;
         xpparam_t diff_params;
         xdemitconf_t emit_params;
@@ -285,8 +285,10 @@ int cgit_diff_files(const unsigned char *old_sha1,
         memset(&diff_params, 0, sizeof(diff_params));
         memset(&emit_params, 0, sizeof(emit_params));
         memset(&emit_cb, 0, sizeof(emit_cb));
         diff_params.flags = XDF_NEED_MINIMAL;
+        if (ignorews)
+                diff_params.flags |= XDF_IGNORE_WHITESPACE;
         emit_params.ctxlen = context > 0 ? context : 3;
         emit_params.flags = XDL_EMIT_FUNCNAMES;
         emit_cb.outf = filediff_cb;
         emit_cb.priv = fn;
@@ -295,9 +297,9 @@ int cgit_diff_files(const unsigned char *old_sha1,
 }
 
 void cgit_diff_tree(const unsigned char *old_sha1,
                     const unsigned char *new_sha1,
-                    filepair_fn fn, const char *prefix)
+                    filepair_fn fn, const char *prefix, int ignorews)
 {
         struct diff_options opt;
         int ret;
         int prefixlen;
@@ -306,8 +308,10 @@ void cgit_diff_tree(const unsigned char *old_sha1,
         opt.output_format = DIFF_FORMAT_CALLBACK;
         opt.detect_rename = 1;
         opt.rename_limit = ctx.cfg.renamelimit;
         DIFF_OPT_SET(&opt, RECURSIVE);
+        if (ignorews)
+                DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
         opt.format_callback = cgit_diff_tree_cb;
         opt.format_callback_data = fn;
         if (prefix) {
                 opt.nr_paths = 1;
@@ -330,9 +334,10 @@ void cgit_diff_commit(struct commit *commit, filepair_fn fn)
         unsigned char *old_sha1 = NULL;
 
         if (commit->parents)
                 old_sha1 = commit->parents->item->object.sha1;
-        cgit_diff_tree(old_sha1, commit->object.sha1, fn, NULL);
+        cgit_diff_tree(old_sha1, commit->object.sha1, fn, NULL,
+                       ctx.qry.ignorews);
 }
 
 int cgit_parse_snapshots_mask(const char *str)
 {
diff --git a/ui-diff.c b/ui-diff.c
index e0a72f7..1656b77 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -126,9 +126,9 @@ static void inspect_filepair(struct diff_filepair *pair)
         files++;
         lines_added = 0;
         lines_removed = 0;
         cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size, &new_size,
-                        &binary, 0, count_diff_lines);
+                        &binary, 0, ctx.qry.ignorews, count_diff_lines);
         if (files >= slots) {
                 if (slots == 0)
                         slots = 4;
                 else
@@ -173,9 +173,10 @@ void cgit_print_diffstat(const unsigned char *old_sha1,
         html(" context)");
         html("</div>");
         html("<table summary='diffstat' class='diffstat'>");
         max_changes = 0;
-        cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, prefix);
+        cgit_diff_tree(old_sha1, new_sha1, inspect_filepair, prefix,
+                       ctx.qry.ignorews);
         for(i = 0; i<files; i++)
                 print_fileinfo(&items[i]);
         html("</table>");
         html("<div class='diffstat-summary'>");
@@ -295,9 +296,10 @@ static void filepair_cb(struct diff_filepair *pair)
                         cgit_ssdiff_footer();
                 return;
         }
         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
-                            &new_size, &binary, ctx.qry.context, print_line_fn))
+                            &new_size, &binary, ctx.qry.context,
+                            ctx.qry.ignorews, print_line_fn))
                 cgit_print_error("Error running diff");
         if (binary) {
                 if (use_ssdiff)
                         html("<tr><td colspan='4'>Binary files differ</td></tr>");
@@ -355,9 +357,10 @@ void cgit_print_diff(const char *new_rev, const char *old_rev, const char *prefi
         } else {
                 html("<table summary='diff' class='diff'>");
                 html("<tr><td>");
         }
-        cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix);
+        cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix,
+                       ctx.qry.ignorews);
         if (!use_ssdiff)
                 html("</td></tr>");
         html("</table>");
 }
diff --git a/ui-log.c b/ui-log.c
index 5eb5c81..354ee08 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -32,9 +32,10 @@ void inspect_files(struct diff_filepair *pair)
 
         files++;
         if (ctx.repo->enable_log_linecount)
                 cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
-                                &new_size, &binary, 0, count_lines);
+                                &new_size, &binary, 0, ctx.qry.ignorews,
+                                count_lines);
 }
 
 void show_commit_decorations(struct commit *commit)
 {
diff --git a/ui-patch.c b/ui-patch.c
index d13104c..ca008f3 100644
--- a/ui-patch.c
+++ b/ui-patch.c
@@ -70,9 +70,9 @@ static void filepair_cb(struct diff_filepair *pair)
                         print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
                 return;
         }
         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, &old_size,
-                            &new_size, &binary, 0, print_line))
+                            &new_size, &binary, 0, 0, print_line))
                 html("Error running diff");
         if (binary)
                 html("Binary files differ\n");
 }
@@ -123,9 +123,9 @@ void cgit_print_patch(char *hex, const char *prefix)
         }
         html("---\n");
         if (prefix)
                 htmlf("(limited to '%s')\n\n", prefix);
-        cgit_diff_tree(old_sha1, sha1, filepair_cb, prefix);
+        cgit_diff_tree(old_sha1, sha1, filepair_cb, prefix, 0);
         html("--\n");
         htmlf("cgit %s\n", CGIT_VERSION);
         cgit_free_commitinfo(info);
 }