added permission error messsage, fix pane line, add root message if running as root

sfm.cpp

@@ -42,6 +42,7 @@ enum {
     CP_OVERLAY_TITLE,
     CP_BUTTON_YES,
     CP_BUTTON_NO,
+    CP_ROOT_WARN,
 };
 
 #define ATTR_DIR            (COLOR_PAIR(CP_DIR)            | A_BOLD)
@@ -54,6 +55,7 @@ enum {
 #define ATTR_MARKER           COLOR_PAIR(CP_MARKER)
 #define ATTR_INFO             COLOR_PAIR(CP_INFO)
 #define ATTR_OVERLAY_BORDER   COLOR_PAIR(CP_OVERLAY_BORDER)
+#define ATTR_ROOT_WARN        (COLOR_PAIR(CP_ROOT_WARN) | A_BOLD)
 
 // ─── Entry data ─────────────────────────────────────────────────────────────
 enum class EntryType { Directory, File, Symlink };
@@ -154,6 +156,7 @@ private:
     bool   show_details_ = false;
     bool   show_preview_ = false;
     bool   searching_    = false;
+    bool   is_root_      = false;
     std::string filter_;
     std::string info_msg_;
 
@@ -321,6 +324,7 @@ void FileManager::init_colors() {
     init_pair(CP_OVERLAY_TITLE,    COLOR_CYAN,    -1);
     init_pair(CP_BUTTON_YES,       COLOR_GREEN,   -1);
     init_pair(CP_BUTTON_NO,        COLOR_RED,     -1);
+    init_pair(CP_ROOT_WARN,       COLOR_RED,     -1);
 }
 
 // ─── directory loading ──────────────────────────────────────────────────────
@@ -554,13 +558,22 @@ void FileManager::draw_botbar() {
         right = "  press ? for help ";
     }
 
-    int total = static_cast<int>(left.size() + right.size());
+    std::string root_tag = is_root_ ? "[root] " : "";
+    int total = static_cast<int>(root_tag.size() + left.size() + right.size());
     int pad   = cols_ - total;
     if (pad < 0) pad = 0;
 
+    int x = 0;
+    if (is_root_) {
+        attron(ATTR_ROOT_WARN);
+        mvprintw(rows_ - 1, 0, "%s", root_tag.c_str());
+        attroff(ATTR_ROOT_WARN);
+        x = static_cast<int>(root_tag.size());
+    }
+
     attron(ATTR_TOPBAR);
-    mvprintw(rows_ - 1, 0, "%s", left.c_str());
+    mvprintw(rows_ - 1, x, "%s", left.c_str());
-    for (int i = 0; i < pad; ++i) mvaddch(rows_ - 1, static_cast<int>(left.size()) + i, ' ');
+    for (int i = 0; i < pad; ++i) mvaddch(rows_ - 1, x + static_cast<int>(left.size()) + i, ' ');
     attroff(ATTR_TOPBAR);
 
     attron(ATTR_INFO);
@@ -711,11 +724,10 @@ void FileManager::draw_preview() {
     if (!e) return;
 
     // Draw vertical divider
-    for (int r = 1; r < rows_ - 1; ++r) {
     attron(ATTR_DIVIDER);
-        mvaddch(r, list_cols_, '|');
+    for (int r = 1; r < rows_ - 1; ++r)
+        mvaddch(r, list_cols_, ACS_VLINE);
     attroff(ATTR_DIVIDER);
-    }
 
     // Clear entire preview area of previous content (stale lines from last preview)
     for (int r = 1; r < rows_ - 1; ++r) {
@@ -1598,6 +1610,12 @@ void FileManager::do_help() {
 void FileManager::do_rename() {
     const Entry *e = get_sel();
     if (!e) return;
+
+    if (access(cwd_.c_str(), W_OK) != 0) {
+        flash_msg("permission denied: " + cwd_);
+        return;
+    }
+
     // Strip trailing / or @
     std::string name = e->name;
     if (!name.empty() && (name.back() == '/' || name.back() == '@'))
@@ -1612,11 +1630,16 @@ void FileManager::do_rename() {
     if (std::rename(src.c_str(), dst.c_str()) == 0) {
         load_entries();
     } else {
-        flash_msg("rename failed");
+        flash_msg("rename failed: " + std::string(std::strerror(errno)));
     }
 }
 
 void FileManager::do_mkdir() {
+    if (access(cwd_.c_str(), W_OK) != 0) {
+        flash_msg("permission denied: " + cwd_);
+        return;
+    }
+
     std::string name;
     if (!read_line(name, " Directory name: ")) { need_full_redraw_ = true; return; }
     if (name.empty()) { flash_msg("cancelled"); return; }
@@ -1625,11 +1648,16 @@ void FileManager::do_mkdir() {
     if (fs::create_directory(path)) {
         load_entries();
     } else {
-        flash_msg("mkdir failed");
+        flash_msg("mkdir failed: " + std::string(std::strerror(errno)));
     }
 }
 
 void FileManager::do_newfile() {
+    if (access(cwd_.c_str(), W_OK) != 0) {
+        flash_msg("permission denied: " + cwd_);
+        return;
+    }
+
     std::string name;
     if (!read_line(name, " File name: ")) { need_full_redraw_ = true; return; }
     if (name.empty()) { flash_msg("cancelled"); return; }
@@ -1640,11 +1668,16 @@ void FileManager::do_newfile() {
         f.close();
         load_entries();
     } else {
-        flash_msg("cannot create file");
+        flash_msg("cannot create file: " + std::string(std::strerror(errno)));
     }
 }
 
 void FileManager::do_delete() {
+    if (access(cwd_.c_str(), W_OK) != 0) {
+        flash_msg("permission denied: " + cwd_);
+        return;
+    }
+
     // Gather items to delete
     std::vector<std::string> targets;
     if (!selected_.empty()) {
@@ -1709,6 +1742,12 @@ void FileManager::do_delete() {
 void FileManager::do_trash() {
     const Entry *e = get_sel();
     if (!e) return;
+
+    if (access(cwd_.c_str(), W_OK) != 0) {
+        flash_msg("permission denied: " + cwd_);
+        return;
+    }
+
     std::string name = e->name;
     if (!name.empty() && name.back() == '/') name.pop_back();
     if (!name.empty() && name.back() == '@') name.pop_back();
@@ -1743,7 +1782,7 @@ void FileManager::do_trash() {
             sel_ = std::max(0, static_cast<int>(entries_.size()) - 2);
         load_entries();
     } else {
-        flash_msg("trash failed");
+        flash_msg("trash failed: " + std::string(std::strerror(errno)));
     }
 }
 
@@ -1805,7 +1844,7 @@ void FileManager::do_chmod_x(bool set) {
         flash_msg(set ? "chmod +x: " + e->name : "chmod -x: " + e->name);
         load_entries();
     } else {
-        flash_msg("chmod failed");
+        flash_msg("chmod failed: " + std::string(std::strerror(errno)));
     }
 }
 
@@ -2021,6 +2060,11 @@ void FileManager::do_paste() {
         return;
     }
 
+    if (access(cwd_.c_str(), W_OK) != 0) {
+        flash_msg("permission denied: " + cwd_);
+        return;
+    }
+
     for (const auto &src : clipboard_paths_) {
         std::string name = fs::path(src).filename().string();
         std::string dst  = join_path(cwd_, name);
@@ -2291,6 +2335,8 @@ void FileManager::run() {
     if (can_color()) init_colors();
     load_entries();
 
+    is_root_ = (geteuid() == 0);
+
     while (true) {
         draw();
         int key = getch();