From c02f0b8182b35df1a318418bbd0036c00be93b5c Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Tue, 19 May 2015 09:14:23 +0000
Subject: source/splitfx: allow watching extra external scripts

Since writing nested shell commands inside YAML is subject to all
sorts of strange quoting rules, encourage users to rely on external
scripts which the YAML file refers to instead.  These scripts can be
written in any reasonable scripting language capable of executing
other commands.

This allows transparently monitoring things such as `my-script.rb'
in the below example when playing my-splitfx.yml via dtas-player:

  --------------------- my-splitfx.yml -----------------------
  infile: input.flac
  command: $INDIR/my-script.rb "$INFILE"
  ...

  --------------------- my-script.rb --------------------------
  #!/usr/bin/ruby
  require 'shellwords'
  infile = ARGV.shift
  ch = %W(sox #{infile} -p).concat((ENV['TRIMFX'] || '').shellsplit)
  fx = %W(highpass 25 gain 9)
  l = ch.dup.concat(%W(remix 1v1)).concat(fx).concat(%w(contrast 30))
  r = ch.dup.concat(%W(remix 2v1)).concat(fx).concat(%w(contrast 0))
  cmd = %W(sox -M |#{l.shelljoin} |#{r.shelljoin})
  cmd.concat((ENV['SOXFMT'] || '-p').shellsplit)
  cmd.concat(%w(- stats))
  warn cmd.inspect
  exec *cmd
---
 lib/dtas/splitfx.rb | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'lib/dtas/splitfx.rb')

diff --git a/lib/dtas/splitfx.rb b/lib/dtas/splitfx.rb
index 5a1431a..cc459ae 100644
--- a/lib/dtas/splitfx.rb
+++ b/lib/dtas/splitfx.rb
@@ -14,7 +14,7 @@ class DTAS::SplitFX # :nodoc:
         '$TRIMFX $FX $RATEFX $DITHERFX'
   include DTAS::Process
   include DTAS::XS
-  attr_reader :infile, :env
+  attr_reader :infile, :env, :command
 
   class UTrim
     attr_reader :env, :comments
@@ -229,11 +229,11 @@ class DTAS::SplitFX # :nodoc:
       sub_env_s = sub_env.inject("") { |s,(k,v)| s << "#{k}=#{v} " }
       env['SOXFMT'] = '-tsox'
       sub_env['OUTFMT'] = env.delete('OUTFMT')
-      show_cmd = [ _expand_cmd(env, player_cmd), '|', '(', "#{sub_env_s};",
-                   _expand_cmd(env.merge(sub_env), command), ')' ].flatten
+      show_cmd = [ expand_cmd(env, player_cmd), '|', '(', "#{sub_env_s};",
+                   expand_cmd(env.merge(sub_env), command), ')' ].flatten
       command = "#{player_cmd} | (#{sub_env_s}; #{command})"
     else
-      show_cmd = _expand_cmd(env, command)
+      show_cmd = expand_cmd(env, command)
     end
 
     echo = "echo #{xs(show_cmd)}"
@@ -397,7 +397,7 @@ class DTAS::SplitFX # :nodoc:
     env["INBASE"] = xs(base)
   end
 
-  def _expand_cmd(env, command)
+  def expand_cmd(env, command)
     Shellwords.split(command).map do |arg|
       qx(env, "printf %s \"#{arg}\"")
     end
-- 
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