Add Printer Font ASCII to recognised PostScript extensions (#3734)

* Register Adobe Type 1 fonts as PostScript files

* Add logic for recognising generated PFA files

* Extend list of PostScript generators

lib/linguist/generated.rb

@@ -244,7 +244,11 @@ module Linguist
     #
     # Returns true or false.
     def generated_postscript?
-      return false unless ['.ps', '.eps'].include? extname
+      return false unless ['.ps', '.eps', '.pfa'].include? extname
+
+      # Type 1 and Type 42 fonts converted to PostScript are stored as hex-encoded byte streams; these
+      # streams are always preceded the `eexec` operator (if Type 1), or the `/sfnts` key (if Type 42).
+      return true if data =~ /(\n|\r\n|\r)\s*(?:currentfile eexec\s+|\/sfnts\s+\[\1<)\h{8,}\1/
 
       # We analyze the "%%Creator:" comment, which contains the author/generator
       # of the file. If there is one, it should be in one of the first few lines.
@@ -254,10 +258,12 @@ module Linguist
       # Most generators write their version number, while human authors' or companies'
       # names don't contain numbers. So look if the line contains digits. Also
       # look for some special cases without version numbers.
-      return creator =~ /[0-9]/ ||
-        creator.include?("mpage") ||
-        creator.include?("draw") ||
-        creator.include?("ImageMagick")
+      return true if creator =~ /[0-9]|draw|mpage|ImageMagick|inkscape|MATLAB/ ||
+        creator =~ /PCBNEW|pnmtops|\(Unknown\)|Serif Affinity|Filterimage -tops/
+
+      # EAGLE doesn't include a version number when it generates PostScript.
+      # However, it does prepend its name to the document's "%%Title" field.
+      !!creator.include?("EAGLE") and lines[0..4].find {|line| line =~ /^%%Title: EAGLE Drawing /}
     end
 
     def generated_go?

lib/linguist/languages.yml

@@ -3325,6 +3325,7 @@ PostScript:
   extensions:
   - ".ps"
   - ".eps"
+  - ".pfa"
   tm_scope: source.postscript
   aliases:
   - postscr

samples/PostScript/lambda.pfa

@@ -0,0 +1,78 @@
+%!PS-AdobeFont-1.0: Greek_Lambda_Character-Regular 020.017
+%%Title: Greek_Lambda_Character-Regular
+%Version: 020.017
+%%CreationDate: Sun Jul 23 23:14:02 2017
+%%Creator: John Gardner /ThatGuyLinguistWatchersAreSickOf
+%Copyright: NONE. NADA. PUBLIC DOMAIN, BOI
+% Generated by FontForge 20170719 (http://fontforge.sf.net/)
+%%EndComments
+
+10 dict begin
+/FontType 1 def
+/FontMatrix [0.000488281 0 0 0.000488281 0 0 ]readonly def
+/FontName /Greek_Lambda_Character-Regular def
+/FontBBox {68 -362 1158 1556 }readonly def
+/PaintType 0 def
+/FontInfo 11 dict dup begin
+ /version (020.017) readonly def
+ /Notice (NONE. NADA. PUBLIC DOMAIN, BOI) readonly def
+ /FullName (Greek_Lambda_Character Regular) readonly def
+ /FamilyName (Greek_Lambda_Character) readonly def
+ /Weight (Regular) readonly def
+ /FSType 8 def
+ /ItalicAngle 0 def
+ /isFixedPitch false def
+ /UnderlinePosition -175 def
+ /UnderlineThickness 90 def
+ /ascent 1556 def
+end readonly def
+/Encoding 256 array
+ 0 1 255 { 1 index exch /.notdef put} for
+dup 13/uni000D put
+dup 32/space put
+readonly def
+currentdict end
+currentfile eexec
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+cleartomark

test/test_generated.rb

@@ -94,5 +94,8 @@ class TestGenerated < Minitest::Test
 
     # roxygen2
     generated_sample_loading_data("R/import.Rd")
+
+    # PostScript
+    generated_sample_loading_data("PostScript/lambda.pfa")
   end
 end