irb tweaks.

.irbrc

@@ -1,15 +1,20 @@
-env = (ENV["IRB_PROMPT"] || ENV["APP_ENV"] || ENV["RACK_ENV"] || "unknown").upcase
+env = (ENV["IRB_PROMPT"] || ENV["APP_ENV"] || ENV["RACK_ENV"] || "").upcase
 if env == "PRODUCTION" || env == "DEPLOYMENT"
   color = "31"
 else
   color = "33"
 end
+prompt = "%03n "
+prompt += "\e[#{color}m#{env} " if env
+prompt += "\e[33m"
 
 IRB.conf[:PROMPT][:CUSTOM] = {
-  PROMPT_I: "%03n \e[#{color}m#{env} >>\e[0m ",
-  PROMPT_N: "%03n \e[#{color}m#{env} \e[1;33m>>\e[0m ",
-  PROMPT_S: nil,
-  PROMPT_C: "%03n \e[#{color}m#{env} \e[33m?>\e[0m ",
-  RETURN:   "\e[#{color}m#{env} \e[32m=>\e[0m %s\n"
+  PROMPT_I: "#{prompt}>>\e[0m ",
+  PROMPT_N: "#{prompt}>>\e[0m ",
+  PROMPT_S: "#{prompt}%l>\e[0m ",
+  PROMPT_C: "#{prompt}?>\e[0m ",
+  RETURN:   "\e[32m=>\e[0m %s\n",
 }
 IRB.conf[:PROMPT_MODE] = :CUSTOM
+
+IRB.conf[:USE_AUTOCOMPLETE] = false

Dockerfile

@@ -37,6 +37,9 @@ RUN bundle install --retry=3 --jobs=4
 COPY . .
 RUN find
 
+# Disable irb history to prevent .irb_history permission error from showing
+RUN echo "IRB.conf[:SAVE_HISTORY] = nil" >> .irbrc
+
 # Run the container as an unprivileged user
 RUN mkdir -p tmp
 RUN chown nobody:nogroup tmp

Gemfile

@@ -3,7 +3,7 @@ source "https://rubygems.org"
 ruby ">= 2.7.0"
 
 gem "rake", require: false
-gem "irb", "=1.4.0" # https://github.com/ruby/irb/commit/99d3aa979dffece1fab06a7d5ebff4ae5da50aae
+gem "irb"
 gem "rack"
 gem "sinatra"
 gem "puma"

Gemfile.lock

@@ -20,7 +20,7 @@ GEM
     github-release-party (0.3.6)
       rake (>= 12)
     io-console (0.5.11)
-    irb (1.4.0)
+    irb (1.4.2)
       reline (>= 0.3.0)
     loofah (2.19.0)
       crass (~> 1.0.2)
@@ -93,7 +93,7 @@ DEPENDENCIES
   dotenv
   feedjira
   github-release-party
-  irb (= 1.4.0)
+  irb
   newrelic_rpm
   nokogiri
   opengraph_parser