[:comment] show markdown preview of the comment text

Author: tstack

src/cmds.io.cc

@@ -1199,7 +1199,7 @@ com_open(exec_context& ec, std::string cmdline, std::vector<std::string>& args)
                         file_range range;
 
                         lb.set_fd(preview_fd);
-                        for (int lpc = 0; lpc < 10; lpc++) {
+                        for (int lpc = 0; lpc < 24; lpc++) {
                             auto load_result = lb.load_next_line(range);
 
                             if (load_result.isErr()) {
@@ -1243,10 +1243,14 @@ com_open(exec_context& ec, std::string cmdline, std::vector<std::string>& args)
                     }
                 }
 
+                auto tf = detect_text_format(al.get_string(), fn_str);
+                log_debug(":open preview text format: %s",
+                          fmt::to_string(tf).c_str());
+
                 lnav_data.ld_preview_view[0].set_sub_source(
                     &lnav_data.ld_preview_source[0]);
                 lnav_data.ld_preview_source[0].replace_with(al).set_text_format(
-                    detect_text_format(al.get_string()));
+                    tf);
                 lnav_data.ld_preview_status_source[0]
                     .get_description()
                     .set_value("For file: %s", fn.c_str());

src/lnav_commands.cc

@@ -73,6 +73,8 @@
 #include "log_format_loader.hh"
 #include "log_search_table.hh"
 #include "log_search_table_fwd.hh"
+#include "md2attr_line.hh"
+#include "md4cpp.hh"
 #include "ptimec.hh"
 #include "readline_callbacks.hh"
 #include "readline_highlighters.hh"
@@ -1882,7 +1884,22 @@ com_comment(exec_context& ec,
     std::string retval;
 
     if (args.size() > 1) {
+        args[1] = trim(remaining_args(cmdline, args));
+
         if (ec.ec_dry_run) {
+            md2attr_line mdal;
+
+            auto parse_res = md4cpp::parse(args[1], mdal);
+            if (parse_res.isOk()) {
+                auto al = parse_res.unwrap();
+                lnav_data.ld_preview_status_source[0]
+                    .get_description()
+                    .set_value("Comment rendered as markdown:");
+                lnav_data.ld_preview_view[0].set_sub_source(
+                    &lnav_data.ld_preview_source[0]);
+                lnav_data.ld_preview_source[0].replace_with(al);
+            }
+
             return Ok(std::string());
         }
         auto* tc = *lnav_data.ld_view_stack.top();
@@ -1893,7 +1910,6 @@ com_comment(exec_context& ec,
         }
         auto& lss = lnav_data.ld_log_source;
 
-        args[1] = trim(remaining_args(cmdline, args));
         auto unquoted = auto_buffer::alloc(args[1].size() + 1);
         auto unquoted_len = unquote_content(
             unquoted.in(), args[1].c_str(), args[1].size(), 0);

src/themes/dracula.json

@@ -11,6 +11,7 @@
                     "bgdarker": "#191A21",
                     "foreground": "#F8F8F2",
                     "selection": "#44475A",
+                    "comment": "#6272A4",
                     "black": "#21222C",
                     "red": "#FF5555",
                     "green": "#50FA7B",
@@ -193,7 +194,7 @@
                         "bold": true
                     },
                     "comment": {
-                        "color": "#6272A4"
+                        "color": "$comment"
                     },
                     "doc-directive": {
                         "color": "$pink"

test/expected/test_cli.sh_0b3639753916f71254e8c9cce4ebb8bfd9978d3e.out

@@ -1016,6 +1016,7 @@
                     "bglighter": "#424450",
                     "black": "#21222C",
                     "blue": "#BD93F9",
+                    "comment": "#6272A4",
                     "cyan": "#8BE9FD",
                     "foreground": "#F8F8F2",
                     "green": "#50FA7B",
@@ -1445,7 +1446,7 @@
                         "strike": false
                     },
                     "comment": {
-                        "color": "#6272A4",
+                        "color": "$comment",
                         "background-color": "",
                         "underline": false,
                         "bold": false,