fix: prefix formatting should be done by the template

default_config.toml

@@ -1,5 +1,5 @@
 message_keys = ["short_message", "msg", "message"]
 time_keys = ["timestamp", "time", "@timestamp"]
 level_keys = ["level", "severity", "log.level", "loglevel"]
-main_line_format = "{{bold(fixed_size 19 fblog_timestamp)}} {{level_style (uppercase (fixed_size 5 fblog_level))}}:{{bold(cyan fblog_prefix)}} {{fblog_message}}"
+main_line_format = "{{bold(fixed_size 19 fblog_timestamp)}} {{level_style (uppercase (fixed_size 5 fblog_level))}}:{{#if fblog_prefix}} {{bold(cyan fblog_prefix)}}{{/if}} {{fblog_message}}"
 additional_value_format = "{{bold (color_rgb 150 150 150 (fixed_size 25 key))}}: {{value}}"

src/log.rs

@@ -17,7 +17,7 @@ pub fn print_log_line(
     let string_log_entry = flatten_json(log_entry, "");
     let level = get_string_value_or_default(&string_log_entry, &log_settings.level_keys, "unknown");
 
-    let formatted_prefix = maybe_prefix.map(|p| format!(" {}", p)).unwrap_or_else(|| "".to_owned());
+    let trimmed_prefix = maybe_prefix.map(|p| p.trim()).unwrap_or_else(|| "").to_string();
     let mut message = get_string_value_or_default(&string_log_entry, &log_settings.message_keys, "");
     let timestamp = get_string_value_or_default(&string_log_entry, &log_settings.time_keys, "");
 
@@ -31,7 +31,7 @@ pub fn print_log_line(
     handle_bar_input.insert("fblog_timestamp".to_string(), Value::String(timestamp));
     handle_bar_input.insert("fblog_level".to_string(), Value::String(level));
     handle_bar_input.insert("fblog_message".to_string(), Value::String(message));
-    handle_bar_input.insert("fblog_prefix".to_string(), Value::String(formatted_prefix));
+    handle_bar_input.insert("fblog_prefix".to_string(), Value::String(trimmed_prefix));
 
     let write_result = match handlebars.render("main_line", &handle_bar_input) {
         Ok(string) => writeln!(out, "{}", string),

src/template.rs

@@ -4,7 +4,7 @@ use std::convert::TryInto;
 use yansi::{Color, Style};
 
 pub static DEFAULT_MAIN_LINE_FORMAT: &str =
-    "{{bold(fixed_size 19 fblog_timestamp)}} {{level_style (uppercase (fixed_size 5 fblog_level))}}:{{bold(cyan fblog_prefix)}} {{fblog_message}}";
+    "{{bold(fixed_size 19 fblog_timestamp)}} {{level_style (uppercase (fixed_size 5 fblog_level))}}:{{#if fblog_prefix}} {{bold(cyan fblog_prefix)}}{{/if}} {{fblog_message}}";
 pub static DEFAULT_ADDITIONAL_VALUE_FORMAT: &str = "{{bold (color_rgb 150 150 150 (fixed_size 25 key))}}: {{value}}";
 
 fn level_to_style(level: &str) -> Style {