More flexible verbosity, improve verbose test

src/lib.rs

@@ -31,7 +31,7 @@ use crate::evaluate::Evaluator;
 use crate::png::PngData;
 use crate::png::PngImage;
 use crate::reduction::*;
-use log::{debug, info, warn};
+use log::{debug, info, trace, warn};
 use rayon::prelude::*;
 use std::fmt;
 use std::fs::{copy, File, Metadata};
@@ -330,7 +330,7 @@ pub fn optimize(input: &InFile, output: &OutFile, opts: &Options) -> PngResult<(
                         ))
                     })
                     .map(Some)?;
-                debug!("preserving metadata: {:?}", opt_metadata_preserved);
+                trace!("preserving metadata: {:?}", opt_metadata_preserved);
             } else {
                 opt_metadata_preserved = None;
             }
@@ -532,7 +532,7 @@ fn optimize_png(
             }
 
             if !filters.is_empty() {
-                debug!("Evaluating: {} filters", filters.len());
+                trace!("Evaluating: {} filters", filters.len());
                 let eval = Evaluator::new(deadline, filters, eval_compression, opts.optimize_alpha);
                 if eval_filter.is_some() {
                     eval.set_best_size(png.idat_data.len());
@@ -746,16 +746,20 @@ fn perform_trial(
     match new_idat {
         Ok(n) => {
             let bytes = n.len();
-            debug!(
+            trace!(
                 "    zc = {}  f = {}  {} bytes",
-                trial.compression, trial.filter, bytes
+                trial.compression,
+                trial.filter,
+                bytes
             );
             Some((trial, n))
         }
         Err(PngError::DeflatedDataTooLong(bytes)) => {
-            debug!(
+            trace!(
                 "    zc = {}  f = {} >{} bytes",
-                trial.compression, trial.filter, bytes,
+                trial.compression,
+                trial.filter,
+                bytes,
             );
             None
         }
@@ -1032,9 +1036,10 @@ fn copy_times(_: &Metadata, _: &Path) -> PngResult<()> {
 fn copy_times(input_path_meta: &Metadata, out_path: &Path) -> PngResult<()> {
     let atime = filetime::FileTime::from_last_access_time(input_path_meta);
     let mtime = filetime::FileTime::from_last_modification_time(input_path_meta);
-    debug!(
+    trace!(
         "attempting to set file times: atime: {:?}, mtime: {:?}",
-        atime, mtime
+        atime,
+        mtime
     );
     filetime::set_file_times(out_path, atime, mtime).map_err(|err_io| {
         PngError::new(&format!(

src/main.rs

@@ -13,7 +13,7 @@
 #![warn(clippy::range_plus_one)]
 #![allow(clippy::cognitive_complexity)]
 
-use clap::{AppSettings, Arg, ArgMatches, Command};
+use clap::{AppSettings, Arg, ArgAction, ArgMatches, Command};
 use indexmap::IndexSet;
 use log::{error, warn};
 use oxipng::Deflaters;
@@ -154,9 +154,10 @@ fn main() {
         )
         .arg(
             Arg::new("verbose")
-                .help("Run in verbose mode")
+                .help("Run in verbose mode (use multiple times to increase verbosity)")
                 .short('v')
                 .long("verbose")
+                .action(ArgAction::Count)
                 .conflicts_with("quiet"),
         )
         .arg(
@@ -381,7 +382,7 @@ fn parse_opts_into_struct(
     stderrlog::new()
         .module(module_path!())
         .quiet(matches.is_present("quiet"))
-        .verbosity(if matches.is_present("verbose") { 3 } else { 2 })
+        .verbosity(matches.get_count("verbose") as usize + 2)
         .show_level(false)
         .init()
         .unwrap();

tests/flags.rs

@@ -180,35 +180,27 @@ fn verbose_mode() {
     });
 
     let logs: Vec<_> = receiver.into_iter().collect();
-    println!("logs={:?}", logs);
+    let expected_prefixes = [
-    assert_eq!(logs.len(), 9);
-    let expected_logs = [
         "    500x400 pixels, PNG format",
         "    3x8 bits/pixel, RGB (non-interlaced)",
         "    IDAT size = 113794 bytes",
         "    File size = 114708 bytes",
         "Trying: 1 filters",
-        "    zc = 11  f = None      149409 bytes",
         "Found better combination:",
-        "    zc = 11  f = None      149409 bytes",
+        "    zc = 11  f = None ",
-        "    IDAT size = 149409 bytes",
+        "    IDAT size = ",
     ];
-    for (idx, expected_log) in expected_logs.into_iter().enumerate() {
+    assert_eq!(logs.len(), expected_prefixes.len());
-        if let Some(log) = logs.get(idx) {
+    for (i, log) in logs.into_iter().enumerate() {
-            if !log.starts_with(expected_log) {
+        let expected_prefix = expected_prefixes[i];
-                panic!(
+        assert!(
+            log.starts_with(&expected_prefix),
             "logs[{}] = {:?} doesn't start with {:?}",
-                    idx, log, expected_log
+            i,
+            log,
+            expected_prefix
         );
     }
-        } else {
-            panic!(
-                "Expected to find {} log entries, but got {}",
-                expected_logs.len(),
-                logs.len()
-            );
-        }
-    }
 }
 
 #[test]