[tracker/wip/carlosg/hotdoc: 23/47] docs: Generalize class hierarchy creation further

[Carlos Garnacho <carlosg src gnome org>]

commit 0b67c247da1f21a21561cfb6ef80b629d6cc0daa
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jun 2 12:09:39 2021 +0200

    docs: Generalize class hierarchy creation further
    
    Let the caller produce the links in the format it likes.

 docs/tools/tracker-docgen-xml.c | 15 ++++++++-
 docs/tools/tracker-utils.c      | 69 +++++++++++++++++++++++------------------
 docs/tools/tracker-utils.h      |  5 ++-
 3 files changed, 56 insertions(+), 33 deletions(-)
---
diff --git a/docs/tools/tracker-docgen-xml.c b/docs/tools/tracker-docgen-xml.c
index c95ca89e7..5751a93ec 100644
--- a/docs/tools/tracker-docgen-xml.c
+++ b/docs/tools/tracker-docgen-xml.c
@@ -78,7 +78,20 @@ print_class_hierarchy (FILE                 *f,
 
        for (i = 0; i < strings->len; i++) {
                HierarchyString *str = g_ptr_array_index (strings, i);
-               g_fprintf (f, "    %s\n", str->str->str);
+
+               if (str->class == klass) {
+                       g_fprintf (f, "    %s<emphasis><link linkend=\"%s\">%s</link></emphasis>%s\n",
+                                  str->before->str,
+                                  str->class->shortname,
+                                  str->link_label->str,
+                                  str->after->str);
+               } else {
+                       g_fprintf (f, "    %s<link linkend=\"%s\">%s</link>%s\n",
+                                  str->before->str,
+                                  str->class->shortname,
+                                  str->link_label->str,
+                                  str->after->str);
+               }
        }
 
        g_fprintf (f, "</screen></refsect3>\n");
diff --git a/docs/tools/tracker-utils.c b/docs/tools/tracker-utils.c
index bf72a8de3..498ff4a4a 100644
--- a/docs/tools/tracker-utils.c
+++ b/docs/tools/tracker-utils.c
@@ -26,6 +26,11 @@
 
 #include "tracker-utils.h"
 
+enum {
+       INSERT_BEFORE,
+       INSERT_AFTER
+};
+
 static void
 class_get_parent_hierarchy (TrackerOntologyModel  *model,
                             const gchar           *class_name,
@@ -86,7 +91,9 @@ hierarchy_string_new (void)
        HierarchyString *str;
 
        str = g_new0 (HierarchyString, 1);
-       str->str = g_string_new ("");
+       str->before = g_string_new ("");
+       str->after = g_string_new ("");
+       str->link_label = g_string_new ("");
 
        return str;
 }
@@ -94,31 +101,32 @@ hierarchy_string_new (void)
 static void
 hierarchy_string_free (HierarchyString *str)
 {
-       g_string_free (str->str, TRUE);
+       g_string_free (str->before, TRUE);
+       g_string_free (str->after, TRUE);
+       g_string_free (str->link_label, TRUE);
        g_free (str);
 }
 
 static void
 hierarchy_string_append (HierarchyString *str,
+                         int              pos,
                          const gchar     *substr)
 {
-       g_string_append (str->str, substr);
+       if (pos == INSERT_BEFORE)
+               g_string_append (str->before, substr);
+       else
+               g_string_append (str->after, substr);
+
        str->visible_len += g_utf8_strlen (substr, -1);
 }
 
 static void
-hierarchy_string_append_link (HierarchyString *str,
-                              const gchar     *substr,
-                              const gchar     *link,
-                              gboolean         bold)
+hierarchy_string_append_link (HierarchyString      *str,
+                              TrackerOntologyClass *klass)
 {
-       if (bold)
-               g_string_append_printf (str->str, "<emphasis><link linkend=\"%s\">%s</link></emphasis>",
-                                       link, substr);
-       else
-               g_string_append_printf (str->str, "<link linkend=\"%s\">%s</link>", link, substr);
-
-       str->visible_len += g_utf8_strlen (substr, -1);
+       g_string_append (str->link_label, klass->shortname);
+       str->class = klass;
+       str->visible_len += g_utf8_strlen (klass->shortname, -1);
 }
 
 static GList *
@@ -212,6 +220,7 @@ hierarchy_context_get_single_parented_children (HierarchyContext     *context,
 
 static void
 fill_padding (HierarchyString *str,
+              gint             pos,
               gint             max_len,
               gchar           *substr)
 {
@@ -221,7 +230,7 @@ fill_padding (HierarchyString *str,
                return;
 
        while (padding > 0) {
-               hierarchy_string_append (str, substr);
+               hierarchy_string_append (str, pos, substr);
                padding--;
        }
 }
@@ -249,14 +258,12 @@ hierarchy_context_resolve_class (HierarchyContext     *context,
                                       (GCompareFunc) g_strcmp0);
        gint pos = g_list_position (context->hierarchy, l);
        GList *children, *parents;
-       const gchar *shortname, *link;
        HierarchyString *str;
        gboolean is_child;
 
        if (pos < 0)
                return;
 
-       shortname = link = klass->shortname;
        parents = g_hash_table_lookup (context->resolved_parents,
                                       klass->classname);
 
@@ -293,25 +300,25 @@ hierarchy_context_resolve_class (HierarchyContext     *context,
 
                        str = g_ptr_array_index (context->strings, i);
 
-                       fill_padding (str, max_len, is_child ? "─" : " ");
+                       fill_padding (str, INSERT_AFTER, max_len, is_child ? "─" : " ");
 
                        if (first_pending) {
-                               hierarchy_string_append (str, "──┐");
+                               hierarchy_string_append (str, INSERT_AFTER, "──┐");
                                first_pending = FALSE;
                        } else if (is_child) {
-                               hierarchy_string_append (str, "──┤");
+                               hierarchy_string_append (str, INSERT_AFTER, "──┤");
                        } else {
-                               hierarchy_string_append (str, "  │");
+                               hierarchy_string_append (str, INSERT_AFTER, "  │");
                        }
                }
 
                /* Step 3: Finally, print the current class */
                str = g_ptr_array_index (context->strings, pos);
-               fill_padding (str, max_len - 1, " ");
+               fill_padding (str, INSERT_BEFORE, max_len - 1, " ");
 
-               hierarchy_string_append (str, "   └── ");
-               hierarchy_string_append_link (str, shortname, link, klass == context->class);
-               hierarchy_string_append (str, " ");
+               hierarchy_string_append (str, INSERT_BEFORE, "   └── ");
+               hierarchy_string_append_link (str, klass);
+               hierarchy_string_append (str, INSERT_AFTER, " ");
        } else {
                /* The current class has only 1 parent, lineart for those is
                 * displayed on the left side.
@@ -319,8 +326,8 @@ hierarchy_context_resolve_class (HierarchyContext     *context,
 
                /* Step 1: Print the current class */
                str = g_ptr_array_index (context->strings, pos);
-               hierarchy_string_append_link (str, shortname, link, klass == context->class);
-               hierarchy_string_append (str, " ");
+               hierarchy_string_append_link (str, klass);
+               hierarchy_string_append (str, INSERT_AFTER, " ");
 
                /* Step 2: Modify all strings downwards, adding the lineart
                 * necessary for all children of this class.
@@ -340,16 +347,16 @@ hierarchy_context_resolve_class (HierarchyContext     *context,
 
                        if (is_child) {
                                if (len > 1)
-                                       hierarchy_string_append (str, "├── ");
+                                       hierarchy_string_append (str, INSERT_BEFORE, "├── ");
                                else if (len == 1)
-                                       hierarchy_string_append (str, "╰── ");
+                                       hierarchy_string_append (str, INSERT_BEFORE, "╰── ");
 
                                children = g_list_delete_link (children, cur);
                                g_hash_table_insert (context->placed,
                                                     l->data, GINT_TO_POINTER (TRUE));
                        } else {
                                if (len > 0)
-                                       hierarchy_string_append (str, "│   ");
+                                       hierarchy_string_append (str, INSERT_BEFORE, "│   ");
                                else if (len == 0 &&
                                         !g_hash_table_lookup (context->placed, l->data)) {
                                        GList *cl_parents;
@@ -358,7 +365,7 @@ hierarchy_context_resolve_class (HierarchyContext     *context,
 
                                        if (g_list_length (cl_parents) == 1 ||
                                            !check_parents_placed (cl_parents, context->placed)) {
-                                               hierarchy_string_append (str, "    ");
+                                               hierarchy_string_append (str, INSERT_BEFORE, "    ");
                                        }
                                }
                        }
diff --git a/docs/tools/tracker-utils.h b/docs/tools/tracker-utils.h
index 9c7365ca7..8a9eb2c17 100644
--- a/docs/tools/tracker-utils.h
+++ b/docs/tools/tracker-utils.h
@@ -28,7 +28,10 @@
 G_BEGIN_DECLS
 
 typedef struct {
-       GString *str;
+       GString *before;
+       GString *after;
+       GString *link_label;
+       TrackerOntologyClass *class;
        gint visible_len;
 } HierarchyString;