[prompt] restore alt value

src/base/attr_line.cc

@@ -51,7 +51,7 @@ attr_line_t::from_table_cell_content(const string_fragment& content,
     static constexpr auto LF_SYMBOL = "\u240a"sv;
     static constexpr auto CR_SYMBOL = "\u240d"sv;
     static constexpr auto REP_SYMBOL = "\ufffd"sv;
-    static const std::string ELLIPSIS = "\u22ef";
+    static constexpr auto ELLIPSIS = "\u22ef"_frag;
 
     auto has_ansi = false;
     size_t char_width = 0;
@@ -191,6 +191,7 @@ attr_line_t&
 attr_line_t::with_ansi_string(const std::string& str)
 {
     this->al_string = str;
+    this->al_attrs.clear();
     scrub_ansi_string(this->al_string, &this->al_attrs);
 
     return *this;
@@ -200,6 +201,7 @@ attr_line_t&
 attr_line_t::with_ansi_string(const string_fragment& str)
 {
     this->al_string = str.to_string();
+    this->al_attrs.clear();
     scrub_ansi_string(this->al_string, &this->al_attrs);
 
     return *this;

src/base/attr_line.hh

@@ -320,6 +320,19 @@ public:
         return *this;
     }
 
+    attr_line_t& append(const std::pair<string_fragment, role_t> value)
+    {
+        size_t start_len = this->al_string.length();
+
+        this->al_string.append(value.first.data(), value.first.length());
+
+        line_range lr{(int) start_len, (int) this->al_string.length()};
+
+        this->al_attrs.emplace_back(lr, VC_ROLE.value(value.second));
+
+        return *this;
+    }
+
     template<typename S>
     attr_line_t& append_quoted(const std::pair<S, string_attr_pair>& value)
     {
@@ -469,6 +482,24 @@ public:
         return *this;
     }
 
+    attr_line_t& insert(size_t index, const std::string& str)
+    {
+        this->al_string.insert(index, str.data(), str.length());
+
+        shift_string_attrs(this->al_attrs, index, str.length());
+
+        return *this;
+    }
+
+    attr_line_t& insert(size_t index, string_fragment str)
+    {
+        this->al_string.insert(index, str.data(), str.length());
+
+        shift_string_attrs(this->al_attrs, index, str.length());
+
+        return *this;
+    }
+
     template<typename S>
     attr_line_t& insert(size_t index,
                         const std::pair<S, string_attr_pair>& value)
@@ -487,6 +518,23 @@ public:
         return *this;
     }
 
+    attr_line_t& insert(size_t index,
+                        const std::pair<string_fragment, role_t>& value)
+    {
+        size_t start_len = this->al_string.length();
+
+        this->insert(index, value.first);
+
+        line_range lr{
+            (int) index,
+            (int) (index + (this->al_string.length() - start_len)),
+        };
+
+        this->al_attrs.emplace_back(lr, VC_ROLE.value(value.second));
+
+        return *this;
+    }
+
     template<typename... Args>
     attr_line_t& add_header(Args... args)
     {

src/base/intern_string.hh

@@ -149,12 +149,12 @@ struct string_fragment {
     {
     }
 
-    bool is_valid() const
+    constexpr bool is_valid() const
     {
         return this->sf_begin != -1 && this->sf_begin <= this->sf_end;
     }
 
-    int length() const { return this->sf_end - this->sf_begin; }
+    constexpr int length() const { return this->sf_end - this->sf_begin; }
 
     Result<ssize_t, const char*> utf8_length() const;
 
@@ -164,7 +164,7 @@ struct string_fragment {
 
     size_t column_width() const;
 
-    const char* data() const { return &this->sf_string[this->sf_begin]; }
+    constexpr const char* data() const { return &this->sf_string[this->sf_begin]; }
 
     const unsigned char* udata() const
     {
@@ -176,13 +176,13 @@ struct string_fragment {
         return (char*) &this->sf_string[this->sf_begin + offset];
     }
 
-    char front() const { return this->sf_string[this->sf_begin]; }
+    constexpr char front() const { return this->sf_string[this->sf_begin]; }
 
     uint32_t front_codepoint() const;
 
-    char back() const { return this->sf_string[this->sf_end - 1]; }
+    constexpr char back() const { return this->sf_string[this->sf_end - 1]; }
 
-    void pop_back()
+    constexpr void pop_back()
     {
         if (!this->empty()) {
             this->sf_end -= 1;
@@ -200,7 +200,7 @@ struct string_fragment {
 
     string_fragment sub_cell_range(int cell_start, int cell_end) const;
 
-    const char& operator[](size_t index) const
+    constexpr const char& operator[](size_t index) const
     {
         return this->sf_string[sf_begin + index];
     }
@@ -291,7 +291,7 @@ struct string_fragment {
         return *suffix == '\0';
     }
 
-    string_fragment substr(int begin) const
+    constexpr string_fragment substr(int begin) const
     {
         return string_fragment{
             this->sf_string, this->sf_begin + begin, this->sf_end};
@@ -309,13 +309,13 @@ struct string_fragment {
             this->sf_string, this->sf_begin + begin, this->sf_begin + end};
     }
 
-    bool contains(const string_fragment& sf) const
+    constexpr bool contains(const string_fragment& sf) const
     {
         return this->sf_string == sf.sf_string && this->sf_begin <= sf.sf_begin
             && sf.sf_end <= this->sf_end;
     }
 
-    size_t count(char ch) const
+    constexpr size_t count(char ch) const
     {
         size_t retval = 0;