Option to supply custom defmt formats (#818)

* Add output format argument

* Load defmt location data

* Use user-provided defmt format

* Changelog

CHANGELOG.md

@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `watchdog-reset` strategy to `--after` subcommand (#779)
 - Add `ROM` version of `read-flash` command (#812)
 - `espflash` can detect the log format automatically from ESP-HAL metadata. Reqires `esp-println` 0.14 (presumably, yet to be released) (#809)
+- Add `--output-format` option to monitor (#818)
 
 ### Changed
 

espflash/src/cli/mod.rs

@@ -279,9 +279,16 @@ pub struct MonitorConfigArgs {
     /// Avoids restarting the device before monitoring
     #[arg(long, requires = "non_interactive")]
     no_reset: bool,
-    /// Logging format.
+    /// The encoding of the target's serial output.
     #[arg(long, short = 'L')]
     log_format: Option<LogFormat>,
+    /// The format of the printed defmt messages.
+    ///
+    /// You can also use one of two presets: oneline (default) and full.
+    ///
+    /// See <https://defmt.ferrous-systems.com/custom-log-output>
+    #[arg(long, short = 'F')]
+    output_format: Option<String>,
     /// External log processors to use (comma separated executables)
     #[arg(long)]
     processors: Option<String>,

espflash/src/cli/monitor/mod.rs

@@ -109,8 +109,16 @@ pub fn monitor(
         .log_format
         .unwrap_or_else(|| deduce_log_format(elf))
     {
-        LogFormat::Defmt => Box::new(parser::esp_defmt::EspDefmt::new(elf)?),
-        LogFormat::Serial => Box::new(parser::serial::Serial),
+        LogFormat::Defmt => Box::new(parser::esp_defmt::EspDefmt::new(
+            elf,
+            monitor_args.output_format,
+        )?),
+        LogFormat::Serial => {
+            if monitor_args.output_format.is_some() {
+                warn!("Output format specified but log format is serial. Ignoring output format.");
+            }
+            Box::new(parser::serial::Serial)
+        }
     };
 
     let mut external_processors =

espflash/src/cli/monitor/parser/esp_defmt.rs

@@ -1,8 +1,13 @@
 use std::io::Write;
 
 use crossterm::{style::Print, QueueableCommand};
-use defmt_decoder::{Frame, Table};
-use miette::{bail, Context, Diagnostic, Result};
+use defmt_decoder::{
+    log::format::{Formatter, FormatterConfig, FormatterFormat},
+    Frame,
+    Table,
+};
+use log::warn;
+use miette::{bail, ensure, Context, Diagnostic, Result};
 use thiserror::Error;
 
 use crate::cli::monitor::parser::InputParser;
@@ -22,9 +27,13 @@ pub enum DefmtError {
     NoDefmtData,
 
     #[error("Failed to parse defmt data")]
-    #[diagnostic(code(espflash::monitor::defmt::parse_failed))]
+    #[diagnostic(code(espflash::monitor::defmt::table_parse_failed))]
     TableParseFailed,
 
+    #[error("Failed to parse defmt location data")]
+    #[diagnostic(code(espflash::monitor::defmt::location_parse_failed))]
+    LocationDataParseFailed,
+
     #[error("Unsupported defmt encoding: {0:?}. Only rzcobs is supported.")]
     #[diagnostic(code(espflash::monitor::defmt::unsupported_encoding))]
     UnsupportedEncoding(defmt_decoder::Encoding),
@@ -101,16 +110,16 @@ impl FrameDelimiter {
     }
 }
 
-#[derive(Debug)]
-pub struct EspDefmt {
-    delimiter: FrameDelimiter,
+struct DefmtData {
     table: Table,
+    locs: Option<defmt_decoder::Locations>,
+    formatter: Formatter,
 }
 
-impl EspDefmt {
+impl DefmtData {
     /// Loads symbols from the ELF file (if provided) and initializes the
     /// context.
-    fn load_table(elf: Option<&[u8]>) -> Result<Table> {
+    fn load(elf: Option<&[u8]>, output_format: Option<String>) -> Result<Self> {
         let Some(elf) = elf else {
             bail!(DefmtError::NoElf);
         };
@@ -125,35 +134,93 @@ impl EspDefmt {
 
         // We only support rzcobs encoding because it is the only way to multiplex
         // a defmt stream and an ASCII log stream over the same serial port.
-        if encoding == defmt_decoder::Encoding::Rzcobs {
-            Ok(table)
-        } else {
-            bail!(DefmtError::UnsupportedEncoding(encoding))
-        }
-    }
+        ensure!(
+            encoding == defmt_decoder::Encoding::Rzcobs,
+            DefmtError::UnsupportedEncoding(encoding)
+        );
 
-    pub fn new(elf: Option<&[u8]>) -> Result<Self> {
-        Self::load_table(elf).map(|table| Self {
-            delimiter: FrameDelimiter::new(),
+        let locs = table
+            .get_locations(elf)
+            .map_err(|_e| DefmtError::LocationDataParseFailed)?;
+
+        let locs = if !table.is_empty() && locs.is_empty() {
+            warn!("Insufficient DWARF info; compile your program with `debug = 2` to enable location info.");
+            None
+        } else if table.indices().all(|idx| locs.contains_key(&(idx as u64))) {
+            Some(locs)
+        } else {
+            warn!("Location info is incomplete; it will be omitted from the output.");
+            None
+        };
+
+        let show_location = locs.is_some();
+        let has_timestamp = table.has_timestamp();
+
+        let format = match output_format.as_deref() {
+            None | Some("oneline") => FormatterFormat::OneLine {
+                with_location: show_location,
+            },
+            Some("full") => FormatterFormat::Default {
+                with_location: show_location,
+            },
+            Some(format) => FormatterFormat::Custom(format),
+        };
+
+        Ok(Self {
             table,
+            locs,
+            formatter: Formatter::new(FormatterConfig {
+                format,
+                is_timestamp_available: has_timestamp,
+            }),
         })
     }
 
-    fn handle_raw(bytes: &[u8], out: &mut dyn Write) {
-        out.write_all(bytes).unwrap();
-    }
+    fn print(&self, frame: Frame<'_>, out: &mut dyn Write) {
+        let loc = self.locs.as_ref().and_then(|locs| locs.get(&frame.index()));
+        let (file, line, module) = if let Some(loc) = loc {
+            (
+                Some(loc.file.display().to_string()),
+                Some(loc.line.try_into().unwrap()),
+                Some(loc.module.as_str()),
+            )
+        } else {
+            (None, None, None)
+        };
+        let s = self
+            .formatter
+            .format_frame(frame, file.as_deref(), line, module);
 
-    fn handle_defmt(frame: Frame<'_>, out: &mut dyn Write) {
-        out.queue(Print(frame.display(true).to_string())).unwrap();
+        out.queue(Print(s)).unwrap();
         out.queue(Print("\r\n")).unwrap();
 
         out.flush().unwrap();
     }
 }
 
+pub struct EspDefmt {
+    delimiter: FrameDelimiter,
+    defmt_data: DefmtData,
+}
+
+impl std::fmt::Debug for EspDefmt {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("EspDefmt").finish()
+    }
+}
+
+impl EspDefmt {
+    pub fn new(elf: Option<&[u8]>, output_format: Option<String>) -> Result<Self> {
+        DefmtData::load(elf, output_format).map(|defmt_data| Self {
+            delimiter: FrameDelimiter::new(),
+            defmt_data,
+        })
+    }
+}
+
 impl InputParser for EspDefmt {
     fn feed(&mut self, bytes: &[u8], out: &mut dyn Write) {
-        let mut decoder = self.table.new_stream_decoder();
+        let mut decoder = self.defmt_data.table.new_stream_decoder();
 
         self.delimiter.feed(bytes, |frame| match frame {
             FrameKind::Defmt(frame) => {
@@ -162,12 +229,12 @@ impl InputParser for EspDefmt {
                 decoder.received(FRAME_END);
 
                 if let Ok(frame) = decoder.decode() {
-                    Self::handle_defmt(frame, out);
+                    self.defmt_data.print(frame, out);
                 } else {
                     log::warn!("Failed to decode defmt frame");
                 }
             }
-            FrameKind::Raw(bytes) => Self::handle_raw(bytes, out),
+            FrameKind::Raw(bytes) => out.write_all(bytes).unwrap(),
         });
     }
 }