[PATCH] splitfx: add INDIR and INBASE environment variables

[Eric Wong <e@80x24.org>]

These are intended to act like `$(@D)' and `$(@F)' in GNU make(1)
and to ease managing temporary files for some effects
(e.g. noiseprof + noisered in sox) for splitfx users.
---
 Documentation/dtas-splitfx.txt | 2 ++
 lib/dtas/source/splitfx.rb     | 5 +++--
 lib/dtas/splitfx.rb            | 7 ++++++-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/Documentation/dtas-splitfx.txt b/Documentation/dtas-splitfx.txt
index 5aa3086..0fd2f3a 100644
--- a/Documentation/dtas-splitfx.txt
+++ b/Documentation/dtas-splitfx.txt
@@ -99,6 +99,8 @@ dtas-splitfx sets several default environment variables for commands to
 use in targets:
 
 * INFILE - this matches the "infile" directive in the YAML file
+* INDIR - the directory INFILE belongs to
+* INBASE - the basename of INFILE
 * TRIMFX - essential, this supplys the necessary sox(1) trim effect to
   each track.
 * COMMENTS - expands to --comment-file=PATH for sox(1)
diff --git a/lib/dtas/source/splitfx.rb b/lib/dtas/source/splitfx.rb
index 5340f3d..19b2c16 100644
--- a/lib/dtas/source/splitfx.rb
+++ b/lib/dtas/source/splitfx.rb
@@ -7,7 +7,7 @@ require_relative 'watchable'
 
 class DTAS::Source::SplitFX < DTAS::Source::Sox # :nodoc:
   MAX_YAML_SIZE = 512 * 1024
-  attr_writer :sox
+  attr_writer :sox, :sfx
   include DTAS::Source::Watchable if defined?(DTAS::Source::Watchable)
 
   SPLITFX_DEFAULTS = SOX_DEFAULTS.merge(
@@ -45,6 +45,7 @@ class DTAS::Source::SplitFX < DTAS::Source::Sox # :nodoc:
     rv = source_file_dup(ymlfile, offset)
     rv.sox = sox
     rv.env = sfx.env
+    rv.sfx = sfx
     rv
   rescue => e
     warn "#{e.message} (#{e.class})"
@@ -62,7 +63,7 @@ class DTAS::Source::SplitFX < DTAS::Source::Sox # :nodoc:
   def spawn(player_format, rg_state, opts)
     raise "BUG: #{self.inspect}#spawn called twice" if @to_io
     e = @env.merge!(player_format.to_env)
-    e["INFILE"] = @sox.infile
+    @sfx.infile_env(e, @sox.infile)
 
     # make sure these are visible to the "current" command...
     e["TRIMFX"] = @offset ? "trim #@offset" : nil
diff --git a/lib/dtas/splitfx.rb b/lib/dtas/splitfx.rb
index 36cdf9f..e31972a 100644
--- a/lib/dtas/splitfx.rb
+++ b/lib/dtas/splitfx.rb
@@ -187,7 +187,7 @@ class DTAS::SplitFX # :nodoc:
       comments.puts("#{k}=#{v}")
     end
     env["COMMENTS"] = "--comment-file=#{comments.path}"
-    env["INFILE"] = @infile
+    infile_env(env, @infile)
     env["OUTFMT"] = xs(outfmt.to_sox_arg)
     env["SUFFIX"] = outfmt.type
     env.merge!(t.env)
@@ -342,4 +342,9 @@ class DTAS::SplitFX # :nodoc:
     require_relative 'cue_index'
     @cuebp = @tracks.map { |t| DTAS::CueIndex.new(1, "#{t.tstart}s") }
   end
+
+  def infile_env(env, infile)
+    env["INFILE"] = infile
+    env["INDIR"], env["INBASE"] = File.split(File.expand_path(infile))
+  end
 end
-- 
EW