Add support for markup in info boxes

Fixes #2552

17 files changed, 110 insertions, 55 deletions

diff --git a/doc/json_ui.asciidoc b/doc/json_ui.asciidoc
index 67ca3c27..e8dcad09 100644
--- a/doc/json_ui.asciidoc
+++ b/doc/json_ui.asciidoc
@@ -35,7 +35,7 @@ Here are the requests that can be written by the json ui on stdout:
   - inline: display the menu next to (above or below) the anchor coordinate
 * menu_select(int selected)
 * menu_hide()
-* info_show(String title, String content, Coord anchor, Face face, String style)
+* info_show(Line title, Array<Line> content, Coord anchor, Face face, String style)
   style can be:
   - prompt: display the info as a prompt info (anchor is ignored)
   - inline: display the info next to (above or below) the anchor coordinate
diff --git a/doc/pages/changelog.asciidoc b/doc/pages/changelog.asciidoc
index 3312bc97..25494519 100644
--- a/doc/pages/changelog.asciidoc
+++ b/doc/pages/changelog.asciidoc
@@ -17,6 +17,8 @@ released versions.
 
 * `WrapMarker` face used by `wrap -marker` highlighter
 
+* `info` supports markup with the `-markup` switch
+
 == Kakoune 2019.07.01
 
 * Re-organized bundled script files directory hierarchy.
diff --git a/doc/pages/commands.asciidoc b/doc/pages/commands.asciidoc
index f9e239e4..f81c3268 100644
--- a/doc/pages/commands.asciidoc
+++ b/doc/pages/commands.asciidoc
@@ -323,6 +323,10 @@ but not really useful in that context.
 
     *-title* <text>:::
         set the title of the message box
+        
+    *-markup*:::
+        parse markup in both title (if provided) and text. (See
+        <<faces#markup-strings,`:doc faces markup-strings`>>)
 
 *try* <commands> [catch <on_error_commands>]...::
     prevent an error in *commands* from aborting the whole command
diff --git a/src/client.cc b/src/client.cc
index f4a85ccb..c4312aca 100644
--- a/src/client.cc
+++ b/src/client.cc
@@ -411,7 +411,7 @@ void Client::menu_hide()
     m_ui_pending &= ~(MenuShow | MenuSelect);
 }
 
-void Client::info_show(String title, String content, BufferCoord anchor, InfoStyle style)
+void Client::info_show(DisplayLine title, DisplayLineList content, BufferCoord anchor, InfoStyle style)
 {
     if (m_info.style == InfoStyle::Modal) // We already have a modal info opened, do not touch it.
         return;
@@ -421,6 +421,15 @@ void Client::info_show(String title, String content, BufferCoord anchor, InfoSty
     m_ui_pending &= ~InfoHide;
 }
 
+void Client::info_show(StringView title, StringView content, BufferCoord anchor, InfoStyle style)
+{
+    info_show({title.str(), Face{}},
+              content | split<StringView>('\n')
+                      | transform([](StringView s) { return DisplayLine{s.str(), Face{}}; })
+                      | gather<DisplayLineList>(),
+              anchor, style);
+}
+
 void Client::info_hide(bool even_modal)
 {
     if (not even_modal and m_info.style == InfoStyle::Modal)
diff --git a/src/client.hh b/src/client.hh
index e9da7588..3fa27627 100644
--- a/src/client.hh
+++ b/src/client.hh
@@ -45,7 +45,8 @@ public:
     void menu_select(int selected);
     void menu_hide();
 
-    void info_show(String title, String content, BufferCoord anchor, InfoStyle style);
+    void info_show(DisplayLine title, DisplayLineList content, BufferCoord anchor, InfoStyle style);
+    void info_show(StringView title, StringView content, BufferCoord anchor, InfoStyle style);
     void info_hide(bool even_modal = false);
 
     void print_status(DisplayLine status_line);
@@ -119,8 +120,8 @@ private:
 
     struct Info
     {
-        String title;
-        String content;
+        DisplayLine title;
+        DisplayLineList content;
         BufferCoord anchor;
         Optional<DisplayCoord> ui_anchor;
         InfoStyle style;
diff --git a/src/commands.cc b/src/commands.cc
index dd105c69..728b4403 100644
--- a/src/commands.cc
+++ b/src/commands.cc
@@ -2144,6 +2144,7 @@ const CommandDesc info_cmd = {
     ParameterDesc{
         { { "anchor", { true, "set info anchoring <line>.<column>" } },
           { "style", { true, "set info style (above, below, menu, modal)" } },
+          { "markup", { false, "parse markup" } },
           { "title", { true, "set info title" } } },
         ParameterDesc::Flags::None, 0, 1
     },
@@ -2179,7 +2180,16 @@ const CommandDesc info_cmd = {
             }).value_or(BufferCoord{});
 
         auto title = parser.get_switch("title").value_or(StringView{});
-        context.client().info_show(title.str(), parser[0], pos, style);
+        if (parser.get_switch("markup"))
+            context.client().info_show(parse_display_line(title, context.faces()),
+                                       parser[0] | split<StringView>('\n')
+                                                 | transform([&](StringView s) {
+                                                       return parse_display_line(s, context.faces());
+                                                   })
+                                                 | gather<DisplayLineList>(),
+                                       pos, style);
+        else
+            context.client().info_show(title.str(), parser[0], pos, style);
     }
 };
 
diff --git a/src/display_buffer.hh b/src/display_buffer.hh
index 1c8fc53d..01310b26 100644
--- a/src/display_buffer.hh
+++ b/src/display_buffer.hh
@@ -135,6 +135,7 @@ private:
     AtomList  m_atoms;
 };
 
+using DisplayLineList = Vector<DisplayLine>;
 class FaceRegistry;
 
 String fix_atom_text(StringView str);
@@ -143,11 +144,10 @@ DisplayLine parse_display_line(StringView line, const FaceRegistry& faces, const
 class DisplayBuffer : public UseMemoryDomain<MemoryDomain::Display>
 {
 public:
-    using LineList = Vector<DisplayLine>;
     DisplayBuffer() {}
 
-    LineList& lines() { return m_lines; }
-    const LineList& lines() const { return m_lines; }
+    DisplayLineList& lines() { return m_lines; }
+    const DisplayLineList& lines() const { return m_lines; }
 
     // returns the smallest BufferRange which contains every DisplayAtoms
     const BufferRange& range() const { return m_range; }
@@ -160,7 +160,7 @@ public:
     size_t timestamp() const { return m_timestamp; }
 
 private:
-    LineList m_lines;
+    DisplayLineList m_lines;
     BufferRange m_range;
     size_t m_timestamp = -1;
 };
diff --git a/src/highlighters.cc b/src/highlighters.cc
index 000befef..a8f4c433 100644
--- a/src/highlighters.cc
+++ b/src/highlighters.cc
@@ -133,7 +133,7 @@ void apply_highlighter(HighlightContext context,
     if (begin == end)
         return;
 
-    using LineIterator = DisplayBuffer::LineList::iterator;
+    using LineIterator = DisplayLineList::iterator;
     LineIterator first_line;
     Vector<size_t> insert_idx;
     auto line_end = display_buffer.lines().end();
diff --git a/src/json_ui.cc b/src/json_ui.cc
index 51fde617..1182c221 100644
--- a/src/json_ui.cc
+++ b/src/json_ui.cc
@@ -217,7 +217,7 @@ void JsonUI::menu_hide()
     rpc_call("menu_hide");
 }
 
-void JsonUI::info_show(StringView title, StringView content,
+void JsonUI::info_show(const DisplayLine& title, const DisplayLineList& content,
                        DisplayCoord anchor, Face face,
                        InfoStyle style)
 {
diff --git a/src/json_ui.hh b/src/json_ui.hh
index 5e53ab42..7b1abf44 100644
--- a/src/json_ui.hh
+++ b/src/json_ui.hh
@@ -35,7 +35,7 @@ public:
     void menu_select(int selected) override;
     void menu_hide() override;
 
-    void info_show(StringView title, StringView content,
+    void info_show(const DisplayLine& title, const DisplayLineList& content,
                    DisplayCoord anchor, Face face,
                    InfoStyle style) override;
     void info_hide() override;
diff --git a/src/main.cc b/src/main.cc
index a6283b46..8400fb1c 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -517,7 +517,7 @@ std::unique_ptr<UserInterface> make_ui(UIType ui_type)
         void menu_select(int) override {}
         void menu_hide() override {}
 
-        void info_show(StringView, StringView, DisplayCoord, Face, InfoStyle) override {}
+        void info_show(const DisplayLine&, const DisplayLineList&, DisplayCoord, Face, InfoStyle) override {}
         void info_hide() override {}
 
         void draw(const DisplayBuffer&, const Face&, const Face&) override {}
diff --git a/src/ncurses_ui.cc b/src/ncurses_ui.cc
index cd036b34..4e75d958 100644
--- a/src/ncurses_ui.cc
+++ b/src/ncurses_ui.cc
@@ -1032,11 +1032,26 @@ static DisplayCoord compute_pos(DisplayCoord anchor, DisplayCoord size,
 struct InfoBox
 {
     DisplayCoord size;
-    Vector<String> contents;
+    DisplayLineList contents;
 };
 
-InfoBox make_info_box(StringView title, StringView message, ColumnCount max_width,
-                      ConstArrayView<StringView> assistant)
+template<typename... Args>
+void append_atoms(DisplayLine& line, Args&&... args)
+{
+    auto append = overload(
+        [](DisplayLine& line, String str) {
+            line.push_back(DisplayAtom{std::move(str)});
+        },
+        [](DisplayLine& line, const DisplayLine& atoms) {
+            for (auto& atom : atoms)
+                line.push_back(atom);
+        });
+
+    (append(line, args), ...);
+}
+
+InfoBox make_info_box(const DisplayLine& title, const DisplayLineList& content,
+                      ColumnCount max_width, ConstArrayView<StringView> assistant)
 {
     DisplayCoord assistant_size;
     if (not assistant.empty())
@@ -1048,71 +1063,70 @@ InfoBox make_info_box(StringView title, StringView message, ColumnCount max_widt
     if (max_bubble_width < 4)
         return result;
 
-    Vector<StringView> lines = wrap_lines(message, max_bubble_width);
+    ColumnCount bubble_width = title.length() + 2;
+    for (auto& line : content)
+        bubble_width = max(bubble_width, line.length());
 
-    ColumnCount bubble_width = title.column_length() + 2;
-    for (auto& line : lines)
-        bubble_width = max(bubble_width, line.column_length());
-
-    auto line_count = max(assistant_size.line-1, LineCount{(int)lines.size()} + 2);
+    auto line_count = max(assistant_size.line-1, LineCount{(int)content.size()} + 2);
     result.size = DisplayCoord{line_count, bubble_width + assistant_size.column + 4};
     const auto assistant_top_margin = (line_count - assistant_size.line+1) / 2;
     for (LineCount i = 0; i < line_count; ++i)
     {
-        String line;
         constexpr Codepoint dash{L'─'};
+        DisplayLine line;
         if (not assistant.empty())
         {
-            if (i >= assistant_top_margin)
-                line += assistant[(int)min(i - assistant_top_margin, assistant_size.line-1)];
-            else
-                line += assistant[(int)assistant_size.line-1];
+            StringView assistant_line = (i >= assistant_top_margin) ?
+                assistant[(int)min(i - assistant_top_margin, assistant_size.line-1)]
+              : assistant[(int)assistant_size.line-1];
+
+            append_atoms(line, assistant_line.str());
         }
         if (i == 0)
         {
-            if (title.empty())
-                line += "╭─" + String{dash, bubble_width} + "─╮";
+            if (title.atoms().empty())
+                append_atoms(line, "╭─" + String{dash, bubble_width} + "─╮");
             else
             {
-                auto dash_count = bubble_width - title.column_length() - 2;
+                auto dash_count = bubble_width - title.length() - 2;
                 String left{dash, dash_count / 2};
                 String right{dash, dash_count - dash_count / 2};
-                line += "╭─" + left + "┤" + title +"├" + right +"─╮";
+                append_atoms(line, "╭─" + left + "┤", title, "├" + right +"─╮");
             }
         }
-        else if (i < lines.size() + 1)
+        else if (i < content.size() + 1)
         {
-            auto& info_line = lines[(int)i - 1];
-            const ColumnCount padding = bubble_width - info_line.column_length();
-            line += "│ " + info_line + String{' ', padding} + " │";
+            auto& info_line = content[(int)i - 1];
+            const ColumnCount padding = bubble_width - info_line.length();
+            append_atoms(line, "│ ", info_line, String{' ', padding} + " │");
         }
-        else if (i == lines.size() + 1)
-            line += "╰─" + String(dash, bubble_width) + "─╯";
+        else if (i == content.size() + 1)
+            append_atoms(line, "╰─" + String(dash, bubble_width) + "─╯");
 
         result.contents.push_back(std::move(line));
     }
     return result;
 }
 
-InfoBox make_simple_info_box(StringView contents, ColumnCount max_width)
+InfoBox make_simple_info_box(const DisplayLineList& content, ColumnCount max_width)
 {
     InfoBox info_box{};
-    for (auto& line : wrap_lines(contents, max_width))
+    for (auto& line : content)
     {
         ++info_box.size.line;
-        info_box.size.column = std::max(line.column_length(), info_box.size.column);
-        info_box.contents.push_back(line.str());
+        info_box.size.column = std::max(line.length(), info_box.size.column);
+        info_box.contents.push_back(line);
     }
     return info_box;
 }
 
-void NCursesUI::info_show(StringView title, StringView content,
+void NCursesUI::info_show(const DisplayLine& title, const DisplayLineList& content,
                           DisplayCoord anchor, Face face, InfoStyle style)
 {
     info_hide();
 
-    m_info.title = title.str();
-    m_info.content = content.str();
+    m_info.title = title;
+    m_info.content = content;
     m_info.anchor = anchor;
     m_info.face = face;
     m_info.style = style;
@@ -1170,7 +1184,7 @@ void NCursesUI::info_show(StringView title, StringView content,
     for (auto line = 0_line; line < info_box.size.line; ++line)
     {
         m_info.move_cursor(line);
-        m_info.draw(m_palette, DisplayAtom(info_box.contents[(int)line]), face);
+        m_info.draw(m_palette, info_box.contents[(int)line].atoms(), face);
     }
     m_dirty = true;
 }
diff --git a/src/ncurses_ui.hh b/src/ncurses_ui.hh
index d10470ec..7d51cdcb 100644
--- a/src/ncurses_ui.hh
+++ b/src/ncurses_ui.hh
@@ -3,6 +3,7 @@
 
 #include "array_view.hh"
 #include "coord.hh"
+#include "display_buffer.hh"
 #include "event_manager.hh"
 #include "face.hh"
 #include "hash_map.hh"
@@ -44,7 +45,7 @@ public:
     void menu_select(int selected) override;
     void menu_hide() override;
 
-    void info_show(StringView title, StringView content,
+    void info_show(const DisplayLine& title, const DisplayLineList& content,
                    DisplayCoord anchor, Face face,
                    InfoStyle style) override;
     void info_hide() override;
@@ -135,8 +136,8 @@ private:
 
     struct Info : Window
     {
-        String title;
-        String content;
+        DisplayLine title;
+        DisplayLineList content;
         Face face;
         DisplayCoord anchor;
         InfoStyle style;
diff --git a/src/remote.cc b/src/remote.cc
index 8d98533b..6b03edbd 100644
--- a/src/remote.cc
+++ b/src/remote.cc
@@ -356,7 +356,7 @@ public:
     void menu_select(int selected) override;
     void menu_hide() override;
 
-    void info_show(StringView title, StringView content,
+    void info_show(const DisplayLine& title, const DisplayLineList& content,
                    DisplayCoord anchor, Face face,
                    InfoStyle style) override;
     void info_hide() override;
@@ -483,7 +483,7 @@ void RemoteUI::menu_hide()
     send_message(MessageType::MenuHide);
 }
 
-void RemoteUI::info_show(StringView title, StringView content,
+void RemoteUI::info_show(const DisplayLine& title, const DisplayLineList& content,
                          DisplayCoord anchor, Face face,
                          InfoStyle style)
 {
@@ -643,8 +643,8 @@ RemoteClient::RemoteClient(StringView session, StringView name, std::unique_ptr<
                 break;
             case MessageType::InfoShow:
             {
-                auto title = reader.read<String>();
-                auto content = reader.read<String>();
+                auto title = reader.read<DisplayLine>();
+                auto content = reader.read<DisplayLineList>();
                 auto anchor = reader.read<DisplayCoord>();
                 auto face = reader.read<Face>();
                 auto style = reader.read<InfoStyle>();
diff --git a/src/user_interface.hh b/src/user_interface.hh
index b216cbba..5bab3e89 100644
--- a/src/user_interface.hh
+++ b/src/user_interface.hh
@@ -12,6 +12,7 @@ namespace Kakoune
 class String;
 class DisplayBuffer;
 class DisplayLine;
+using DisplayLineList = Vector<DisplayLine, MemoryDomain::Display>;
 struct DisplayCoord;
 struct Face;
 struct Key;
@@ -56,7 +57,8 @@ public:
     virtual void menu_select(int selected) = 0;
     virtual void menu_hide() = 0;
 
-    virtual void info_show(StringView title, StringView content,
+    virtual void info_show(const DisplayLine& title,
+                           const DisplayLineList& content,
                            DisplayCoord anchor, Face face,
                            InfoStyle style) = 0;
     virtual void info_hide() = 0;
diff --git a/src/utils.hh b/src/utils.hh
index f9c53509..0979aebe 100644
--- a/src/utils.hh
+++ b/src/utils.hh
@@ -186,6 +186,18 @@ private:
     Invoker* m_invoker;
 };
 
+template<typename... Funcs>
+struct Overload : Funcs...
+{
+    using Funcs::operator()...;
+};
+
+template<typename... Funcs>
+auto overload(Funcs&&... funcs)
+{
+    return Overload<std::decay_t<Funcs>...>{std::forward<Funcs>(funcs)...};
+}
+
 }
 
 #endif // utils_hh_INCLUDED
diff --git a/src/window.cc b/src/window.cc
index 0ef445ca..cbc4deab 100644
--- a/src/window.cc
+++ b/src/window.cc
@@ -135,7 +135,7 @@ const DisplayBuffer& Window::update_display_buffer(const Context& context)
         }
     }
 
-    DisplayBuffer::LineList& lines = m_display_buffer.lines();
+    DisplayLineList& lines = m_display_buffer.lines();
     m_display_buffer.set_timestamp(buffer().timestamp());
     lines.clear();