LibLine+Userland: Make suggestion offsets per-suggestion

This allows the user to modify different parts of the input with
different suggestions.

6 files changed, 79 insertions, 51 deletions

diff --git a/Userland/Libraries/LibLine/Editor.cpp b/Userland/Libraries/LibLine/Editor.cpp
index 3a5ce1f420..6e33d22941 100644
--- a/Userland/Libraries/LibLine/Editor.cpp
+++ b/Userland/Libraries/LibLine/Editor.cpp
@@ -489,7 +489,7 @@ void Editor::stylize(Span const& span, Style const& style)
     ending_map.set(start, style);
 }
 
-void Editor::suggest(size_t invariant_offset, size_t static_offset, Span::Mode offset_mode) const
+void Editor::transform_suggestion_offsets(size_t& invariant_offset, size_t& static_offset, Span::Mode offset_mode) const
 {
     auto internal_static_offset = static_offset;
     auto internal_invariant_offset = invariant_offset;
@@ -501,7 +501,8 @@ void Editor::suggest(size_t invariant_offset, size_t static_offset, Span::Mode o
         internal_static_offset = offsets.start;
         internal_invariant_offset = offsets.end - offsets.start;
     }
-    m_suggestion_manager.set_suggestion_variants(internal_static_offset, internal_invariant_offset, 0);
+    invariant_offset = internal_invariant_offset;
+    static_offset = internal_static_offset;
 }
 
 void Editor::initialize()
@@ -1141,7 +1142,6 @@ void Editor::handle_read_event()
                 // We have none, or just one suggestion,
                 // we should just commit that and continue
                 // after it, as if it were auto-completed.
-                suggest(0, 0, Span::CodepointOriented);
                 m_times_tab_pressed = 0;
                 m_suggestion_manager.reset();
                 m_suggestion_display->finish();
@@ -1180,7 +1180,6 @@ void Editor::cleanup_suggestions()
             m_refresh_needed = true;
         }
         m_suggestion_manager.reset();
-        suggest(0, 0, Span::CodepointOriented);
         m_suggestion_display->finish();
     }
     m_times_tab_pressed = 0; // Safe to say if we get here, the user didn't press TAB
diff --git a/Userland/Libraries/LibLine/Editor.h b/Userland/Libraries/LibLine/Editor.h
index 4f9cf5746b..446585fe3d 100644
--- a/Userland/Libraries/LibLine/Editor.h
+++ b/Userland/Libraries/LibLine/Editor.h
@@ -221,7 +221,7 @@ public:
     //       +-|- static offset: the suggestions start here
     //         +- invariant offset: the suggestions do not change up to here
     //
-    void suggest(size_t invariant_offset = 0, size_t static_offset = 0, Span::Mode offset_mode = Span::ByteOriented) const;
+    void transform_suggestion_offsets(size_t& invariant_offset, size_t& static_offset, Span::Mode offset_mode = Span::ByteOriented) const;
 
     const struct termios& termios() const { return m_termios; }
     const struct termios& default_termios() const { return m_default_termios; }
diff --git a/Userland/Libraries/LibLine/SuggestionManager.cpp b/Userland/Libraries/LibLine/SuggestionManager.cpp
index fc40862bbd..80cf37b457 100644
--- a/Userland/Libraries/LibLine/SuggestionManager.cpp
+++ b/Userland/Libraries/LibLine/SuggestionManager.cpp
@@ -84,10 +84,12 @@ CompletionSuggestion const& SuggestionManager::suggest()
 
 void SuggestionManager::set_current_suggestion_initiation_index(size_t index)
 {
+    auto& suggestion = m_suggestions[m_next_suggestion_index];
+
     if (m_last_shown_suggestion_display_length)
-        m_last_shown_suggestion.start_index = index - m_next_suggestion_static_offset - m_last_shown_suggestion_display_length;
+        m_last_shown_suggestion.start_index = index - suggestion.static_offset - m_last_shown_suggestion_display_length;
     else
-        m_last_shown_suggestion.start_index = index - m_next_suggestion_static_offset - m_next_suggestion_invariant_offset;
+        m_last_shown_suggestion.start_index = index - suggestion.static_offset - suggestion.invariant_offset;
 
     m_last_shown_suggestion_display_length = m_last_shown_suggestion.text_view.length();
     m_last_shown_suggestion_was_complete = true;
@@ -98,7 +100,9 @@ SuggestionManager::CompletionAttemptResult SuggestionManager::attempt_completion
     CompletionAttemptResult result { mode };
 
     if (m_next_suggestion_index < m_suggestions.size()) {
-        auto can_complete = m_next_suggestion_invariant_offset <= m_largest_common_suggestion_prefix_length;
+        auto& next_suggestion = m_suggestions[m_next_suggestion_index];
+
+        auto can_complete = next_suggestion.invariant_offset <= m_largest_common_suggestion_prefix_length;
         ssize_t actual_offset;
         size_t shown_length = m_last_shown_suggestion_display_length;
         switch (mode) {
@@ -106,7 +110,7 @@ SuggestionManager::CompletionAttemptResult SuggestionManager::attempt_completion
             actual_offset = 0;
             break;
         case ShowSuggestions:
-            actual_offset = 0 - m_largest_common_suggestion_prefix_length + m_next_suggestion_invariant_offset;
+            actual_offset = 0 - m_largest_common_suggestion_prefix_length + next_suggestion.invariant_offset;
             if (can_complete)
                 shown_length = m_largest_common_suggestion_prefix_length + m_last_shown_suggestion.trivia_view.length();
             break;
@@ -114,11 +118,11 @@ SuggestionManager::CompletionAttemptResult SuggestionManager::attempt_completion
             if (m_last_shown_suggestion_display_length == 0)
                 actual_offset = 0;
             else
-                actual_offset = 0 - m_last_shown_suggestion_display_length + m_next_suggestion_invariant_offset;
+                actual_offset = 0 - m_last_shown_suggestion_display_length + next_suggestion.invariant_offset;
             break;
         }
 
-        result.offset_region_to_remove = { m_next_suggestion_invariant_offset, shown_length };
+        result.offset_region_to_remove = { next_suggestion.invariant_offset, shown_length };
         result.new_cursor_offset = actual_offset;
 
         auto& suggestion = suggest();
@@ -127,7 +131,7 @@ SuggestionManager::CompletionAttemptResult SuggestionManager::attempt_completion
         if (mode == CompletePrefix) {
             // Only auto-complete *if possible*.
             if (can_complete) {
-                result.insert.append(suggestion.text_view.substring_view(m_next_suggestion_invariant_offset, m_largest_common_suggestion_prefix_length - m_next_suggestion_invariant_offset));
+                result.insert.append(suggestion.text_view.substring_view(suggestion.invariant_offset, m_largest_common_suggestion_prefix_length - suggestion.invariant_offset));
                 m_last_shown_suggestion_display_length = m_largest_common_suggestion_prefix_length;
                 // Do not increment the suggestion index, as the first tab should only be a *peek*.
                 if (m_suggestions.size() == 1) {
@@ -147,7 +151,7 @@ SuggestionManager::CompletionAttemptResult SuggestionManager::attempt_completion
             m_last_shown_suggestion_was_complete = false;
             m_last_shown_suggestion = String::empty();
         } else {
-            result.insert.append(suggestion.text_view.substring_view(m_next_suggestion_invariant_offset, suggestion.text_view.length() - m_next_suggestion_invariant_offset));
+            result.insert.append(suggestion.text_view.substring_view(suggestion.invariant_offset, suggestion.text_view.length() - suggestion.invariant_offset));
             // Add in the trivia of the last selected suggestion.
             result.insert.append(suggestion.trivia_view);
             m_last_shown_suggestion_display_length += suggestion.trivia_view.length();
diff --git a/Userland/Libraries/LibLine/SuggestionManager.h b/Userland/Libraries/LibLine/SuggestionManager.h
index d1ad97bcf2..b3282cf7f9 100644
--- a/Userland/Libraries/LibLine/SuggestionManager.h
+++ b/Userland/Libraries/LibLine/SuggestionManager.h
@@ -53,6 +53,8 @@ public:
     Style style;
     size_t start_index { 0 };
     size_t input_offset { 0 };
+    size_t static_offset { 0 };
+    size_t invariant_offset { 0 };
 
     Utf32View text_view;
     Utf32View trivia_view;
@@ -102,12 +104,6 @@ public:
 
     void next();
     void previous();
-    void set_suggestion_variants(size_t static_offset, size_t invariant_offset, size_t suggestion_index) const
-    {
-        m_next_suggestion_index = suggestion_index;
-        m_next_suggestion_static_offset = static_offset;
-        m_next_suggestion_invariant_offset = invariant_offset;
-    }
 
     CompletionSuggestion const& suggest();
     CompletionSuggestion const& current_suggestion() const { return m_last_shown_suggestion; }
@@ -131,8 +127,6 @@ private:
     size_t m_last_shown_suggestion_display_length { 0 };
     bool m_last_shown_suggestion_was_complete { false };
     mutable size_t m_next_suggestion_index { 0 };
-    mutable size_t m_next_suggestion_invariant_offset { 0 };
-    mutable size_t m_next_suggestion_static_offset { 0 };
     size_t m_largest_common_suggestion_prefix_length { 0 };
     mutable size_t m_last_displayed_suggestion_index { 0 };
     size_t m_selected_suggestion_index { 0 };
diff --git a/Userland/Shell/Shell.cpp b/Userland/Shell/Shell.cpp
index 9bf307e508..30295eb6b2 100644
--- a/Userland/Shell/Shell.cpp
+++ b/Userland/Shell/Shell.cpp
@@ -1416,8 +1416,10 @@ Vector<Line::CompletionSuggestion> Shell::complete_path(StringView base,
     //      since we are not suggesting anything starting with
     //      `/foo/', but rather just `bar...'
     auto token_length = escape_token(token).length();
+    size_t static_offset = last_slash + 1;
+    auto invariant_offset = token_length;
     if (m_editor)
-        m_editor->suggest(token_length, last_slash + 1);
+        m_editor->transform_suggestion_offsets(invariant_offset, static_offset);
 
     // only suggest dot-files if path starts with a dot
     Core::DirIterator files(path,
@@ -1440,6 +1442,8 @@ Vector<Line::CompletionSuggestion> Shell::complete_path(StringView base,
                     suggestions.append({ escape_token(file), " " });
                 }
                 suggestions.last().input_offset = token_length;
+                suggestions.last().invariant_offset = invariant_offset;
+                suggestions.last().static_offset = static_offset;
             }
         }
     }
@@ -1465,8 +1469,10 @@ Vector<Line::CompletionSuggestion> Shell::complete_program_name(StringView name,
 
     String completion = *match;
     auto token_length = escape_token(name).length();
+    auto invariant_offset = token_length;
+    size_t static_offset = 0;
     if (m_editor)
-        m_editor->suggest(token_length, 0);
+        m_editor->transform_suggestion_offsets(invariant_offset, static_offset);
 
     // Now that we have a program name starting with our token, we look at
     // other program names starting with our token and cut off any mismatching
@@ -1475,16 +1481,17 @@ Vector<Line::CompletionSuggestion> Shell::complete_program_name(StringView name,
     Vector<Line::CompletionSuggestion> suggestions;
 
     int index = match - cached_path.data();
-    for (int i = index - 1; i >= 0 && cached_path[i].starts_with(name); --i) {
+    for (int i = index - 1; i >= 0 && cached_path[i].starts_with(name); --i)
         suggestions.append({ cached_path[i], " " });
-        suggestions.last().input_offset = token_length;
-    }
-    for (size_t i = index + 1; i < cached_path.size() && cached_path[i].starts_with(name); ++i) {
+    for (size_t i = index + 1; i < cached_path.size() && cached_path[i].starts_with(name); ++i)
         suggestions.append({ cached_path[i], " " });
-        suggestions.last().input_offset = token_length;
-    }
     suggestions.append({ cached_path[index], " " });
-    suggestions.last().input_offset = token_length;
+
+    for (auto& entry : suggestions) {
+        entry.input_offset = token_length;
+        entry.invariant_offset = invariant_offset;
+        entry.static_offset = static_offset;
+    }
 
     return suggestions;
 }
@@ -1494,8 +1501,10 @@ Vector<Line::CompletionSuggestion> Shell::complete_variable(StringView name, siz
     Vector<Line::CompletionSuggestion> suggestions;
     auto pattern = offset ? name.substring_view(0, offset) : "";
 
+    auto invariant_offset = offset;
+    size_t static_offset = 0;
     if (m_editor)
-        m_editor->suggest(offset);
+        m_editor->transform_suggestion_offsets(invariant_offset, static_offset);
 
     // Look at local variables.
     for (auto& frame : m_local_frames) {
@@ -1516,10 +1525,15 @@ Vector<Line::CompletionSuggestion> Shell::complete_variable(StringView name, siz
             if (suggestions.contains_slow(name))
                 continue;
             suggestions.append(move(name));
-            suggestions.last().input_offset = offset;
         }
     }
 
+    for (auto& entry : suggestions) {
+        entry.input_offset = offset;
+        entry.invariant_offset = invariant_offset;
+        entry.static_offset = static_offset;
+    }
+
     return suggestions;
 }
 
@@ -1528,8 +1542,10 @@ Vector<Line::CompletionSuggestion> Shell::complete_user(StringView name, size_t
     Vector<Line::CompletionSuggestion> suggestions;
     auto pattern = offset ? name.substring_view(0, offset) : "";
 
+    auto invariant_offset = offset;
+    size_t static_offset = 0;
     if (m_editor)
-        m_editor->suggest(offset);
+        m_editor->transform_suggestion_offsets(invariant_offset, static_offset);
 
     Core::DirIterator di("/home", Core::DirIterator::SkipParentAndBaseDir);
 
@@ -1540,7 +1556,10 @@ Vector<Line::CompletionSuggestion> Shell::complete_user(StringView name, size_t
         String name = di.next_path();
         if (name.starts_with(pattern)) {
             suggestions.append(name);
-            suggestions.last().input_offset = offset;
+            auto& suggestion = suggestions.last();
+            suggestion.input_offset = offset;
+            suggestion.invariant_offset = invariant_offset;
+            suggestion.static_offset = static_offset;
         }
     }
 
@@ -1553,8 +1572,10 @@ Vector<Line::CompletionSuggestion> Shell::complete_option(StringView program_nam
     while (start < option.length() && option[start] == '-' && start < 2)
         ++start;
     auto option_pattern = offset > start ? option.substring_view(start, offset - start) : "";
+    auto invariant_offset = offset;
+    size_t static_offset = 0;
     if (m_editor)
-        m_editor->suggest(offset);
+        m_editor->transform_suggestion_offsets(invariant_offset, static_offset);
 
     Vector<Line::CompletionSuggestion> suggestions;
 
@@ -1579,13 +1600,18 @@ Vector<Line::CompletionSuggestion> Shell::complete_option(StringView program_nam
                 return builder.to_string();
             };
 #define __ENUMERATE_SHELL_OPTION(name, d_, descr_) \
-    if (#name##sv.starts_with(option_pattern)) {   \
-        suggestions.append(maybe_negate(#name));   \
-        suggestions.last().input_offset = offset;  \
-    }
+    if (#name##sv.starts_with(option_pattern))     \
+        suggestions.append(maybe_negate(#name));
 
             ENUMERATE_SHELL_OPTIONS();
 #undef __ENUMERATE_SHELL_OPTION
+
+            for (auto& entry : suggestions) {
+                entry.input_offset = offset;
+                entry.invariant_offset = invariant_offset;
+                entry.static_offset = static_offset;
+            }
+
             return suggestions;
         }
     }
@@ -1596,18 +1622,24 @@ Vector<Line::CompletionSuggestion> Shell::complete_immediate_function_name(Strin
 {
     Vector<Line::CompletionSuggestion> suggestions;
 
-#define __ENUMERATE_SHELL_IMMEDIATE_FUNCTION(fn_name)                 \
-    if (auto name_view = #fn_name##sv; name_view.starts_with(name)) { \
-        suggestions.append({ name_view, " " });                       \
-        suggestions.last().input_offset = offset;                     \
-    }
+    auto invariant_offset = offset;
+    size_t static_offset = 0;
+    if (m_editor)
+        m_editor->transform_suggestion_offsets(invariant_offset, static_offset);
+
+#define __ENUMERATE_SHELL_IMMEDIATE_FUNCTION(fn_name)               \
+    if (auto name_view = #fn_name##sv; name_view.starts_with(name)) \
+        suggestions.append({ name_view, " " });
 
     ENUMERATE_SHELL_IMMEDIATE_FUNCTIONS();
 
 #undef __ENUMERATE_SHELL_IMMEDIATE_FUNCTION
 
-    if (m_editor)
-        m_editor->suggest(offset);
+    for (auto& entry : suggestions) {
+        entry.input_offset = offset;
+        entry.invariant_offset = invariant_offset;
+        entry.static_offset = static_offset;
+    }
 
     return suggestions;
 }
diff --git a/Userland/Utilities/js.cpp b/Userland/Utilities/js.cpp
index fe570e4a50..6672cd01fa 100644
--- a/Userland/Utilities/js.cpp
+++ b/Userland/Utilities/js.cpp
@@ -1580,6 +1580,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
                         Line::CompletionSuggestion completion { key, Line::CompletionSuggestion::ForSearch };
                         if (!results.contains_slow(completion)) { // hide duplicates
                             results.append(String(key));
+                            results.last().invariant_offset = property_pattern.length();
                         }
                     }
                 }
@@ -1605,8 +1606,6 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
                 auto const* object = MUST(variable.to_object(interpreter->global_object()));
                 auto const& shape = object->shape();
                 list_all_properties(shape, property_name);
-                if (results.size())
-                    editor.suggest(property_name.length());
                 break;
             }
             case CompleteVariable: {
@@ -1614,12 +1613,12 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
                 list_all_properties(variable.shape(), variable_name);
 
                 for (String& name : global_environment.declarative_record().bindings()) {
-                    if (name.starts_with(variable_name))
+                    if (name.starts_with(variable_name)) {
                         results.empend(name);
+                        results.last().invariant_offset = variable_name.length();
+                    }
                 }
 
-                if (results.size())
-                    editor.suggest(variable_name.length());
                 break;
             }
             default: