Big update

13 files changed, 1351 insertions, 73 deletions

@@ -0,0 +1,20 @@
+# TRAINFUCK MOTHER CHOO-ER
+# Version #9
+
+PREFIX = /usr/local
+
+.PHONY: help install uninstall
+
+help:
+        @echo "TRAINFUCK!"
+        @echo " make install    Install to $(PREFIX)"
+        @echo " make uninstall  Remove from $(PREFIX)"
+
+install: trainfuck trainfuck.awk fucktrain fucktrain.awk
+        install -Dt $(DESTDIR)$(PREFIX)/bin/ $?
+
+uninstall:
+        rm $(DESTDIR)$(PREFIX)/trainfuck
+        rm $(DESTDIR)$(PREFIX)/trainfuck.awk
+        rm $(DESTDIR)$(PREFIX)/fucktrain
+        rm $(DESTDIR)$(PREFIX)/fucktrain.awk
@@ -1,7 +1,8 @@
 # TRAINFUCK
 
-an esolang that transpiles to everyone's favorite esolange
+an esolang that transpiles to everyone's favorite esolang
 (so basically an awk script)
+**NOW WITH MORE SCRIPTING CAPABILITIES!**
 
 ## LANGUAGE
 
@@ -33,19 +34,19 @@ because fuck you, that's why.
 ## INVOKING
 
 ```
-trainfuck FILE | BRAINFUCK_INTERPRETER
+trainfuck FILE.tf
 ```
 
 Or, for round-tripping ...
 
 ```
-fucktrain FILE | trainfuck | BRAINFUCK_INTERPRETER
+fucktrain FILE.bf | trainfuck
 ```
 
 ## INSTALL
 
 ```
-cp trainfuck /usr/sbin/
+make install
 ```
 
 ## UNINSTALL
@@ -0,0 +1,500 @@
+  Add two values
+from https://en.wikipedia.org/wiki/Brainfuck#Adding_two_values
+
+
+
+
+ALL ABOARD
+chug chug
+END OF THE LINE
+       Cell c0 = 2
+
+ALL ABOARD
+choo
+
+END OF THE LINE
+
+ALL ABOARD
+chug chug chug chug chug
+END OF THE LINE
+  Cell c1 = 5
+
+
+ALL ABOARD
+tickets please
+END OF THE LINE
+        Start your loops with your cell pointer on the loop counter (c1 in our case)
+
+ALL ABOARD
+choo choo
+
+END OF THE LINE
+
+ALL ABOARD
+chug
+END OF THE LINE
+      Add 1 to c0
+
+ALL ABOARD
+choo
+
+END OF THE LINE
+
+ALL ABOARD
+chugga
+END OF THE LINE
+      Subtract 1 from c1
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+        End your loops with the cell pointer on the loop counter
+
+At this point our program has added 5 to 2 leaving 7 in c0 and 0 in c1
+but we cannot output this value to the terminal since it is not ASCII encoded
+
+To display the ASCII character "7" we must add 48 to the value 7
+We use a loop to compute 48 = 6 * 8
+
+
+ALL ABOARD
+chug chug chug chug
+END OF THE LINE
+
+ALL ABOARD
+chug chug chug chug
+END OF THE LINE
+  c1 = 8 and this will be our loop counter again
+
+ALL ABOARD
+tickets please
+choo choo
+
+END OF THE LINE
+
+ALL ABOARD
+chug chug chug
+END OF THE LINE
+
+ALL ABOARD
+chug chug chug
+END OF THE LINE
+  Add 6 to c0
+
+ALL ABOARD
+choo
+
+END OF THE LINE
+
+ALL ABOARD
+chugga
+END OF THE LINE
+        Subtract 1 from c1
+
+ALL ABOARD
+your ticket please
+choo choo
+
+END OF THE LINE
+
+ALL ABOARD
+click
+END OF THE LINE
+        Print out c0 which has the value 55 which translates to "7"!
+
+Finally print a newline:
+
+ALL ABOARD
+chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga
+chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga
+chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga
+chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga
+chugga click
+  This program prints "Hello World!" and a newline to the screen, its
+length is 106 active command characters. [It is not the shortest.]
+
+This loop is an "initial comment loop", a simple way of adding a comment
+to a BF program such that you don't have to worry about any command
+characters. Any ".", ",", "+", "-", "<" and ">" characters are simply
+ignored, the "[" and "]" characters just have to be balanced. This
+loop and the commands it contains are ignored because the current cell
+defaults to a value of 0; the 0 value causes this loop to be skipped.
+
+from https://en.wikipedia.org/wiki/Brainfuck#Hello_World!
+
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug
+END OF THE LINE
+        Set Cell #0 to 8
+
+ALL ABOARD
+tickets please
+choo
+chug chug chug chug
+END OF THE LINE
+                Add 4 to Cell #1; this will always set Cell #1 to 4
+
+ALL ABOARD
+tickets please
+END OF THE LINE
+                as the cell will be cleared by the loop
+
+ALL ABOARD
+choo
+chug chug
+END OF THE LINE
+                Add 2 to Cell #2
+
+ALL ABOARD
+choo
+chug chug chug
+END OF THE LINE
+                Add 3 to Cell #3
+
+ALL ABOARD
+choo
+chug chug chug
+END OF THE LINE
+                Add 3 to Cell #4
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #5
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+                Decrement the loop counter in Cell #1
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                Loop until Cell #1 is zero; number of iterations is 4
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #2
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #3
+
+ALL ABOARD
+choo
+chugga
+END OF THE LINE
+                Subtract 1 from Cell #4
+
+ALL ABOARD
+choo
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #6
+
+ALL ABOARD
+tickets please choo choo
+your ticket please
+END OF THE LINE
+                Move back to the first zero cell you find; this will
+                be Cell #1 which was cleared by the previous loop
+
+ALL ABOARD
+choo choo
+chugga
+END OF THE LINE
+                Decrement the loop Counter in Cell #0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                Loop until Cell #0 is zero; number of iterations is 8
+
+The result of this is:
+Cell no :   0   1   2   3   4   5   6
+Contents:   0   0  72 104  88  32   8
+Pointer :   ^
+
+
+ALL ABOARD
+choo
+choo
+click
+END OF THE LINE
+                        Cell #2 has value 72 which is 'H'
+
+ALL ABOARD
+choo
+chugga chugga chugga click
+END OF THE LINE
+                        Subtract 3 from Cell #3 to get 101 which is 'e'
+
+ALL ABOARD
+chug chug chug chug chug chug chug clickety click chug chug chug click
+
+END OF THE LINE
+                Likewise for 'llo' from Cell #3
+
+ALL ABOARD
+choo
+choo
+click
+END OF THE LINE
+                        Cell #5 is 32 for the space
+
+ALL ABOARD
+choo choo
+chugga clickety
+END OF THE LINE
+                        Subtract 1 from Cell #4 for 87 to give a 'W'
+
+ALL ABOARD
+choo choo
+clickety
+END OF THE LINE
+                        Cell #3 was set to 'o' from the end of 'Hello'
+
+ALL ABOARD
+chug chug chug click chugga chugga chugga chugga chugga chugga clickety
+chugga chugga chugga chugga chugga chugga chugga chugga click
+END OF THE LINE
+        Cell #3 for 'rl' and 'd'
+
+ALL ABOARD
+choo
+choo
+chug click
+END OF THE LINE
+                        Add 1 to Cell #5 gives us an exclamation point
+
+ALL ABOARD
+choo
+chug chug click
+END OF THE LINE
+                        And finally a newline from Cell #6
+  ROT13 in Brainfuck
+from https://en.wikipedia.org/wiki/Brainfuck#ROT13
+
+
+
+
+ALL ABOARD
+chugga clack chug tickets please
+END OF THE LINE
+                         Read first character and start outer character reading loop
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+                       Skip forward if character is 0
+
+ALL ABOARD
+choo
+choo
+chug chug chug chug tickets please choo
+chug chug chug chug chug chug chug chug
+choo choo
+chugga your ticket please
+END OF THE LINE
+  Set up divisor (32) for division loop
+(MEMORY LAYOUT: dividend copy remainder divisor quotient zero zero)
+
+ALL ABOARD
+choo choo
+chug choo choo
+chugga tickets please
+END OF THE LINE
+                Set up dividend (x minus 1) and enter division loop
+
+ALL ABOARD
+choo
+chug choo
+chug choo
+chugga tickets please choo
+choo
+choo
+your ticket please
+END OF THE LINE
+      Increase copy and remainder / reduce divisor / Normal case: skip forward
+
+ALL ABOARD
+choo choo
+tickets please tickets please choo
+chug choo choo
+chugga your ticket please choo
+choo
+chug choo
+your ticket please
+
+END OF THE LINE
+    Special case: move remainder back to divisor and increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrement dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+your ticket please choo
+choo
+choo
+tickets please chugga your ticket please chug
+END OF THE LINE
+                 End skip loop; zero former divisor and reuse space for a flag
+
+ALL ABOARD
+choo
+chugga chugga tickets please chugga tickets please choo choo
+chugga choo
+chug chug chug
+tickets please chugga your ticket please your ticket please your ticket please
+choo choo
+tickets please
+END OF THE LINE
+         Zero that flag unless quotient was 2 or 3; zero quotient; check flag
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug chug chug chug chug choo choo
+tickets please
+
+END OF THE LINE
+       If flag then set up divisor (13) for second division loop
+(MEMORY LAYOUT: zero copy dividend divisor remainder quotient zero zero)
+
+ALL ABOARD
+choo
+chugga tickets please choo
+chug choo
+choo
+your ticket please
+END OF THE LINE
+         Reduce divisor; Normal case: increase remainder
+
+ALL ABOARD
+choo
+tickets please chug tickets please choo choo
+chug choo
+chugga your ticket please choo
+chug
+choo
+choo
+your ticket please
+END OF THE LINE
+   Special case: increase remainder / move it back to divisor / increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrease dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+choo
+choo
+tickets please choo choo
+chug choo
+chugga your ticket please
+END OF THE LINE
+             Add remainder back to divisor to get a useful 13
+
+ALL ABOARD
+choo
+tickets please
+END OF THE LINE
+                   Skip forward if quotient was 0
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+               Decrement quotient and skip forward if quotient was 1
+
+ALL ABOARD
+chugga choo choo
+choo choo
+tickets please chugga your ticket please choo
+choo
+
+END OF THE LINE
+     Zero quotient and divisor if quotient was 2
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chugga choo
+choo
+chugga your ticket please choo
+choo
+
+END OF THE LINE
+    Zero divisor and subtract 13 from copy if quotient was 1
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chug choo
+choo
+chugga your ticket please
+END OF THE LINE
+          Zero divisor and add 13 to copy if quotient was 0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                        End outer skip loop (jump to here if ((character minus 1)/32) was not 2 or 3)
+
+ALL ABOARD
+choo choo
+tickets please chugga your ticket please
+END OF THE LINE
+                     Clear remainder from first division if second division was skipped
+
+ALL ABOARD
+choo choo
+click tickets please chugga your ticket please
+END OF THE LINE
+                    Output ROT13ed character from copy and clear it
+
+ALL ABOARD
+choo choo
+chugga clack chug
+END OF THE LINE
+                     Read next character
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                            End character reading loop
@@ -8,38 +8,37 @@ ignored, the "[" and "]" characters just have to be balanced. This
 loop and the commands it contains are ignored because the current cell
 defaults to a value of 0; the 0 value causes this loop to be skipped.
 
-from https://en.wikipedia.org/wiki/Brainfuck#Hello_World!
-]
-++++++++               Set Cell #0 to 8
+from https://en.wikipedia.org/wiki/Brainfuck#Hello_World! ]
+++++++++        Set Cell #0 to 8
 [
->++++               Add 4 to Cell #1; this will always set Cell #1 to 4
-[                   as the cell will be cleared by the loop
->++             Add 2 to Cell #2
->+++            Add 3 to Cell #3
->+++            Add 3 to Cell #4
->+              Add 1 to Cell #5
-<<<<-           Decrement the loop counter in Cell #1
-]                   Loop until Cell #1 is zero; number of iterations is 4
->+                  Add 1 to Cell #2
->+                  Add 1 to Cell #3
->-                  Subtract 1 from Cell #4
->>+                 Add 1 to Cell #6
-[<]                 Move back to the first zero cell you find; this will
-be Cell #1 which was cleared by the previous loop
-<-                  Decrement the loop Counter in Cell #0
-]                       Loop until Cell #0 is zero; number of iterations is 8
+>++++           Add 4 to Cell #1; this will always set Cell #1 to 4
+[               as the cell will be cleared by the loop
+>++             Add 2 to Cell #2
+>+++            Add 3 to Cell #3
+>+++            Add 3 to Cell #4
+>+              Add 1 to Cell #5
+<<<<-           Decrement the loop counter in Cell #1
+]               Loop until Cell #1 is zero; number of iterations is 4
+>+              Add 1 to Cell #2
+>+              Add 1 to Cell #3
+>-              Subtract 1 from Cell #4
+>>+             Add 1 to Cell #6
+[<]             Move back to the first zero cell you find; this will
+                be Cell #1 which was cleared by the previous loop
+<-              Decrement the loop Counter in Cell #0
+]               Loop until Cell #0 is zero; number of iterations is 8
 
 The result of this is:
 Cell no :   0   1   2   3   4   5   6
 Contents:   0   0  72 104  88  32   8
 Pointer :   ^
 
->>.                     Cell #2 has value 72 which is 'H'
->---.                   Subtract 3 from Cell #3 to get 101 which is 'e'
-+++++++..+++.           Likewise for 'llo' from Cell #3
->>.                     Cell #5 is 32 for the space
-<-.                     Subtract 1 from Cell #4 for 87 to give a 'W'
-<.                      Cell #3 was set to 'o' from the end of 'Hello'
-+++.------.--------.    Cell #3 for 'rl' and 'd'
->>+.                    Add 1 to Cell #5 gives us an exclamation point
->++.                    And finally a newline from Cell #6
+>>.                     Cell #2 has value 72 which is 'H'
+>---.                   Subtract 3 from Cell #3 to get 101 which is 'e'
++++++++..+++.           Likewise for 'llo' from Cell #3
+>>.                     Cell #5 is 32 for the space
+<-.                     Subtract 1 from Cell #4 for 87 to give a 'W'
+<.                      Cell #3 was set to 'o' from the end of 'Hello'
++++.------.--------.    Cell #3 for 'rl' and 'd'
+>>+.                    Add 1 to Cell #5 gives us an exclamation point
+>++.                    And finally a newline from Cell #6
@@ -0,0 +1,388 @@
+  This program prints "Hello World!" and a newline to the screen, its
+length is 106 active command characters. [It is not the shortest.]
+
+This loop is an "initial comment loop", a simple way of adding a comment
+to a BF program such that you don't have to worry about any command
+characters. Any ".", ",", "+", "-", "<" and ">" characters are simply
+ignored, the "[" and "]" characters just have to be balanced. This
+loop and the commands it contains are ignored because the current cell
+defaults to a value of 0; the 0 value causes this loop to be skipped.
+
+from https://en.wikipedia.org/wiki/Brainfuck#Hello_World!
+
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug
+END OF THE LINE
+        Set Cell #0 to 8
+
+ALL ABOARD
+tickets please
+choo
+chug chug chug chug
+END OF THE LINE
+                Add 4 to Cell #1; this will always set Cell #1 to 4
+
+ALL ABOARD
+tickets please
+END OF THE LINE
+                as the cell will be cleared by the loop
+
+ALL ABOARD
+choo
+chug chug
+END OF THE LINE
+                Add 2 to Cell #2
+
+ALL ABOARD
+choo
+chug chug chug
+END OF THE LINE
+                Add 3 to Cell #3
+
+ALL ABOARD
+choo
+chug chug chug
+END OF THE LINE
+                Add 3 to Cell #4
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #5
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+                Decrement the loop counter in Cell #1
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                Loop until Cell #1 is zero; number of iterations is 4
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #2
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #3
+
+ALL ABOARD
+choo
+chugga
+END OF THE LINE
+                Subtract 1 from Cell #4
+
+ALL ABOARD
+choo
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #6
+
+ALL ABOARD
+tickets please choo choo
+your ticket please
+END OF THE LINE
+                Move back to the first zero cell you find; this will
+                be Cell #1 which was cleared by the previous loop
+
+ALL ABOARD
+choo choo
+chugga
+END OF THE LINE
+                Decrement the loop Counter in Cell #0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                Loop until Cell #0 is zero; number of iterations is 8
+
+The result of this is:
+Cell no :   0   1   2   3   4   5   6
+Contents:   0   0  72 104  88  32   8
+Pointer :   ^
+
+
+ALL ABOARD
+choo
+choo
+click
+END OF THE LINE
+                        Cell #2 has value 72 which is 'H'
+
+ALL ABOARD
+choo
+chugga chugga chugga click
+END OF THE LINE
+                        Subtract 3 from Cell #3 to get 101 which is 'e'
+
+ALL ABOARD
+chug chug chug chug chug chug chug clickety click chug chug chug click
+
+END OF THE LINE
+                Likewise for 'llo' from Cell #3
+
+ALL ABOARD
+choo
+choo
+click
+END OF THE LINE
+                        Cell #5 is 32 for the space
+
+ALL ABOARD
+choo choo
+chugga clickety
+END OF THE LINE
+                        Subtract 1 from Cell #4 for 87 to give a 'W'
+
+ALL ABOARD
+choo choo
+clickety
+END OF THE LINE
+                        Cell #3 was set to 'o' from the end of 'Hello'
+
+ALL ABOARD
+chug chug chug click chugga chugga chugga chugga chugga chugga clickety
+chugga chugga chugga chugga chugga chugga chugga chugga click
+END OF THE LINE
+        Cell #3 for 'rl' and 'd'
+
+ALL ABOARD
+choo
+choo
+chug click
+END OF THE LINE
+                        Add 1 to Cell #5 gives us an exclamation point
+
+ALL ABOARD
+choo
+chug chug click
+END OF THE LINE
+                        And finally a newline from Cell #6
+  ROT13 in Brainfuck
+from https://en.wikipedia.org/wiki/Brainfuck#ROT13
+
+
+
+
+ALL ABOARD
+chugga clack chug tickets please
+END OF THE LINE
+                         Read first character and start outer character reading loop
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+                       Skip forward if character is 0
+
+ALL ABOARD
+choo
+choo
+chug chug chug chug tickets please choo
+chug chug chug chug chug chug chug chug
+choo choo
+chugga your ticket please
+END OF THE LINE
+  Set up divisor (32) for division loop
+(MEMORY LAYOUT: dividend copy remainder divisor quotient zero zero)
+
+ALL ABOARD
+choo choo
+chug choo choo
+chugga tickets please
+END OF THE LINE
+                Set up dividend (x minus 1) and enter division loop
+
+ALL ABOARD
+choo
+chug choo
+chug choo
+chugga tickets please choo
+choo
+choo
+your ticket please
+END OF THE LINE
+      Increase copy and remainder / reduce divisor / Normal case: skip forward
+
+ALL ABOARD
+choo choo
+tickets please tickets please choo
+chug choo choo
+chugga your ticket please choo
+choo
+chug choo
+your ticket please
+
+END OF THE LINE
+    Special case: move remainder back to divisor and increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrement dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+your ticket please choo
+choo
+choo
+tickets please chugga your ticket please chug
+END OF THE LINE
+                 End skip loop; zero former divisor and reuse space for a flag
+
+ALL ABOARD
+choo
+chugga chugga tickets please chugga tickets please choo choo
+chugga choo
+chug chug chug
+tickets please chugga your ticket please your ticket please your ticket please
+choo choo
+tickets please
+END OF THE LINE
+         Zero that flag unless quotient was 2 or 3; zero quotient; check flag
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug chug chug chug chug choo choo
+tickets please
+
+END OF THE LINE
+       If flag then set up divisor (13) for second division loop
+(MEMORY LAYOUT: zero copy dividend divisor remainder quotient zero zero)
+
+ALL ABOARD
+choo
+chugga tickets please choo
+chug choo
+choo
+your ticket please
+END OF THE LINE
+         Reduce divisor; Normal case: increase remainder
+
+ALL ABOARD
+choo
+tickets please chug tickets please choo choo
+chug choo
+chugga your ticket please choo
+chug
+choo
+choo
+your ticket please
+END OF THE LINE
+   Special case: increase remainder / move it back to divisor / increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrease dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+choo
+choo
+tickets please choo choo
+chug choo
+chugga your ticket please
+END OF THE LINE
+             Add remainder back to divisor to get a useful 13
+
+ALL ABOARD
+choo
+tickets please
+END OF THE LINE
+                   Skip forward if quotient was 0
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+               Decrement quotient and skip forward if quotient was 1
+
+ALL ABOARD
+chugga choo choo
+choo choo
+tickets please chugga your ticket please choo
+choo
+
+END OF THE LINE
+     Zero quotient and divisor if quotient was 2
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chugga choo
+choo
+chugga your ticket please choo
+choo
+
+END OF THE LINE
+    Zero divisor and subtract 13 from copy if quotient was 1
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chug choo
+choo
+chugga your ticket please
+END OF THE LINE
+          Zero divisor and add 13 to copy if quotient was 0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                        End outer skip loop (jump to here if ((character minus 1)/32) was not 2 or 3)
+
+ALL ABOARD
+choo choo
+tickets please chugga your ticket please
+END OF THE LINE
+                     Clear remainder from first division if second division was skipped
+
+ALL ABOARD
+choo choo
+click tickets please chugga your ticket please
+END OF THE LINE
+                    Output ROT13ed character from copy and clear it
+
+ALL ABOARD
+choo choo
+chugga clack chug
+END OF THE LINE
+                     Read next character
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                            End character reading loop
@@ -0,0 +1,5 @@
+[ printchar is a small example input/output trainfuck program.
+it waits for the user to press a key, then prints that key
+and a newline to the screen.
+]
+,.>++++++++++.
@@ -0,0 +1,10 @@
+printchar is a small example input/output trainfuck program.
+it waits for the user to press a key, then prints that key
+and a newline to the screen.
+ALL ABOARD
+clack clickety
+choo
+chug chug chug chug chug
+chug chug chug chug chug
+click
+END OF THE LINE
@@ -0,0 +1,215 @@
+  ROT13 in Brainfuck
+from https://en.wikipedia.org/wiki/Brainfuck#ROT13
+
+
+
+
+ALL ABOARD
+chugga clack chug tickets please
+END OF THE LINE
+                         Read first character and start outer character reading loop
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+                       Skip forward if character is 0
+
+ALL ABOARD
+choo
+choo
+chug chug chug chug tickets please choo
+chug chug chug chug chug chug chug chug
+choo choo
+chugga your ticket please
+END OF THE LINE
+  Set up divisor (32) for division loop
+(MEMORY LAYOUT: dividend copy remainder divisor quotient zero zero)
+
+ALL ABOARD
+choo choo
+chug choo choo
+chugga tickets please
+END OF THE LINE
+                Set up dividend (x minus 1) and enter division loop
+
+ALL ABOARD
+choo
+chug choo
+chug choo
+chugga tickets please choo
+choo
+choo
+your ticket please
+END OF THE LINE
+      Increase copy and remainder / reduce divisor / Normal case: skip forward
+
+ALL ABOARD
+choo choo
+tickets please tickets please choo
+chug choo choo
+chugga your ticket please choo
+choo
+chug choo
+your ticket please
+
+END OF THE LINE
+    Special case: move remainder back to divisor and increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrement dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+your ticket please choo
+choo
+choo
+tickets please chugga your ticket please chug
+END OF THE LINE
+                 End skip loop; zero former divisor and reuse space for a flag
+
+ALL ABOARD
+choo
+chugga chugga tickets please chugga tickets please choo choo
+chugga choo
+chug chug chug
+tickets please chugga your ticket please your ticket please your ticket please
+choo choo
+tickets please
+END OF THE LINE
+         Zero that flag unless quotient was 2 or 3; zero quotient; check flag
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug chug chug chug chug choo choo
+tickets please
+
+END OF THE LINE
+       If flag then set up divisor (13) for second division loop
+(MEMORY LAYOUT: zero copy dividend divisor remainder quotient zero zero)
+
+ALL ABOARD
+choo
+chugga tickets please choo
+chug choo
+choo
+your ticket please
+END OF THE LINE
+         Reduce divisor; Normal case: increase remainder
+
+ALL ABOARD
+choo
+tickets please chug tickets please choo choo
+chug choo
+chugga your ticket please choo
+chug
+choo
+choo
+your ticket please
+END OF THE LINE
+   Special case: increase remainder / move it back to divisor / increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrease dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+choo
+choo
+tickets please choo choo
+chug choo
+chugga your ticket please
+END OF THE LINE
+             Add remainder back to divisor to get a useful 13
+
+ALL ABOARD
+choo
+tickets please
+END OF THE LINE
+                   Skip forward if quotient was 0
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+               Decrement quotient and skip forward if quotient was 1
+
+ALL ABOARD
+chugga choo choo
+choo choo
+tickets please chugga your ticket please choo
+choo
+
+END OF THE LINE
+     Zero quotient and divisor if quotient was 2
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chugga choo
+choo
+chugga your ticket please choo
+choo
+
+END OF THE LINE
+    Zero divisor and subtract 13 from copy if quotient was 1
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chug choo
+choo
+chugga your ticket please
+END OF THE LINE
+          Zero divisor and add 13 to copy if quotient was 0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                        End outer skip loop (jump to here if ((character minus 1)/32) was not 2 or 3)
+
+ALL ABOARD
+choo choo
+tickets please chugga your ticket please
+END OF THE LINE
+                     Clear remainder from first division if second division was skipped
+
+ALL ABOARD
+choo choo
+click tickets please chugga your ticket please
+END OF THE LINE
+                    Output ROT13ed character from copy and clear it
+
+ALL ABOARD
+choo choo
+chugga clack chug
+END OF THE LINE
+                     Read next character
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                            End character reading loop
@@ -1,37 +1,30 @@
-#!/bin/awk -f
-# FUCKTRAIN: FUCKAMUTHA CHOO CHOO -*- awk -*-
+#!/bin/sh
+# TRAINFUCK: CHOO CHOO MUTHAFUCKA -*- sh -*-
 # Author: Case Duckworth <acdw@acdw.net>
 # License: WTFPL
 # Version: #9
-BEGIN {
-        print "ALL ABOARD"
-}
 
-{
-        gsub(/[^-+<>.,\[\]]/, "", $0)
-        gsub(/+/, "chug ", $0)
-        gsub(/-/, "chugga ", $0)
-        gsub(/>/, "choo\n", $0)
-        gsub(/</, "choo choo\n", $0)
-        gsub(/\./, clicketyClick(), $0)
-        gsub(/,/, "clack ", $0)
-        gsub(/\[/, "tickets please ", $0)
-        gsub(/\]/, "your ticket please ", $0)
-        if ($0) {
-                print
-        }
-}
+### Commentary:
 
-END {
-        print "END OF THE LINE"
-}
+# shell wrapper around fucktrain.awk, which see.
 
+### Code:
 
-function clicketyClick()
-{
-        if (rand() <= 0.5) {
-                return "click "
-        } else {
-                return "clickety "
-        }
-}
+FUCKTRAIN="$(dirname "$0")/fucktrain.awk"
+
+case "$(realpath "$(command -v awk)")" in
+*gawk)
+        AWK=gawk
+        EXTRA_AWK_ARGS="--characters-as-bytes" # --posix overrides
+        ;;
+*mawk)
+        AWK=mawk
+        EXTRA_AWK_ARGS="-Wposix"
+        ;;
+*)
+        AWK=awk
+        EXTRA_AWK_ARGS=
+        ;;
+esac
+
+"$AWK" -v EXE_NAME="$(basename $0)" -f "$FUCKTRAIN" $EXTRA_AWK_ARGS -- "$@"
@@ -0,0 +1,97 @@
+#!/bin/awk -f
+# FUCKTRAIN: FUCKAMUTHA CHOO CHOO -*- awk -*-
+# Author: Case Duckworth <acdw@acdw.net>
+# License: WTFPL
+# Version: #9
+
+### Commentary:
+
+# FUCKTRAIN turns brainfuck code into trainfuck code.
+
+### Code:
+BEGIN {
+        buffer = ""
+        fold_width = 70
+        width = 0
+}
+
+{
+        buffer = buffer $0 "\n"
+}
+
+END {
+        sub(/^[ \t\n\r\f]+/, "", buffer)
+        sub(/[ \t\n\r\f]+$/, "", buffer)
+        split(buffer, bufa, "")
+        boarded = 0
+        header = 1
+        for (c in bufa) {
+                if (bufa[c] == "[" && header) {
+                        header++
+                        if (header == 2) {
+                                c++
+                        }
+                }
+                if (bufa[c] == "]" && header) {
+                        header--
+                        if (header == 1) {
+                                header = 0
+                                c++
+                        }
+                }
+                if (! boarded && ! header && bufa[c] ~ /[-+<>.,\[\]]/) {
+                        printf "\n%s\n", "ALL ABOARD"
+                        boarded = 1
+                }
+                if (boarded) {
+                        if (width > fold_width) {
+                                print ""
+                                width = 0
+                        }
+                        if (bufa[c] == ">") {
+                                printf "%s", "choo\n"
+                        } else if (bufa[c] == "<") {
+                                printf "%s", "choo choo\n"
+                        } else if (bufa[c] == "+") {
+                                printf "%s", "chug "
+                                width += 5
+                        } else if (bufa[c] == "-") {
+                                printf "%s", "chugga "
+                                width += 7
+                        } else if (bufa[c] == ".") {
+                                click = clickety_click()
+                                printf "%s", click
+                                width += length(click)
+                        } else if (bufa[c] == ",") {
+                                printf "%s", "clack "
+                                width += 6
+                        } else if (bufa[c] == "[") {
+                                printf "%s", "tickets please "
+                                width += 15
+                        } else if (bufa[c] == "]") {
+                                printf "%s", "your ticket please "
+                                width += 19
+                        } else if (bufa[c] ~ /[\n]/) {
+                                printf "%s", bufa[c]
+                                width = 0
+                        } else {
+                                printf "\n%s\n%s", "END OF THE LINE", bufa[c]
+                                boarded = 0
+                        }
+                } else {
+                        width = 0
+                        printf "%s", bufa[c]
+                }
+        }
+        print ""
+}
+
+
+function clickety_click()
+{
+        if (rand() <= 0.5) {
+                return "clickety "
+        } else {
+                return "click "
+        }
+}
@@ -10,6 +10,21 @@
 
 ### Code:
 
-TRAINFUCK=trainfuck.awk
+TRAINFUCK="$(dirname "$0")/trainfuck.awk"
 
-gawk -v EXE_NAME="$(basename $0)" -f "$TRAINFUCK" -- "$@"
+case "$(realpath "$(command -v awk)")" in
+*gawk)
+        AWK=gawk
+        EXTRA_AWK_ARGS="--characters-as-bytes" # --posix overrides
+        ;;
+*mawk)
+        AWK=mawk
+        EXTRA_AWK_ARGS="-Wposix"
+        ;;
+*)
+        AWK=awk
+        EXTRA_AWK_ARGS=
+        ;;
+esac
+
+"$AWK" -v EXE_NAME="$(basename $0)" -f "$TRAINFUCK" $EXTRA_AWK_ARGS -- "$@"
@@ -39,6 +39,7 @@ BEGIN {
         # Constants
         EXE_NAME = (EXE_NAME ? EXE_NAME : "trainfuck")
         ERR_SYNTAX = 1
+        ERR_ARGUMENT = 2
 }
 
 BEGIN {
@@ -46,6 +47,7 @@ BEGIN {
         ABOARD = 0
         FIRST_LINE = 1
         OFS = "\t"
+        header = 0
 }
 
 BF_MODE == "brainfuck" {
@@ -54,14 +56,16 @@ BF_MODE == "brainfuck" {
 }
 
 FIRST_LINE {
-        if (BF_PRINT_COMMENTS && first_line != "[") {
-                eprint("[")
+        if (BF_PRINT_COMMENTS && $0 !~ /^[ \t]\[/) {
+                eprint("[ ", 1)
         }
-        eprint(first_line)
         FIRST_LINE = 0
 }
 
 /^ALL ABOARD$/ {
+        if (NR == 1) {
+                eprint(ARGV[1] " ", 1)
+        }
         if (! header && BF_PRINT_COMMENTS) {
                 eprint("]")
         }
@@ -94,6 +98,7 @@ END {
                 exit dead
         }
         printbuf()
+        print ""
         if (BF_EXECUTE) {
                 brainfuck(bf_program)
         }
@@ -108,8 +113,11 @@ function brainfuck(buffer)
         for (n = 1; n < 30000; n++) {
                 tape[n] = 0
         }
-        while (c <= length(bf)) {
-                # print i, tape[i], c, bf[c]
+        len_bf = 0
+        for (i in bf) {
+                len_bf++
+        }
+        while (c <= len_bf) {
                 if (bf[c] == "<" && c > 1) {
                         i--
                 } else if (bf[c] == ">") {
@@ -163,10 +171,32 @@ function brainfuck(buffer)
         }
 }
 
-function die(message, errnum)
+function char2number(ch)
+{
+        ascii = ""      # NUL is undefined in POSIX awk ... XXX:
+        ascii = ascii "\001\002\003\004\005\006\a\b\t\n\v\f\r\016\017"
+        ascii = ascii "\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037"
+        ascii = ascii " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO"
+        ascii = ascii "PQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\177"
+        ascii = ascii "\200\201\202\203\204\205\206\207\210\211\212\213\214\215\216\217"
+        ascii = ascii "\220\221\222\223\224\225\226\227\230\231\232\233\234\235\236\237"
+        ascii = ascii "\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256\257"
+        ascii = ascii "\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277"
+        ascii = ascii "\300\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317"
+        ascii = ascii "\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337"
+        ascii = ascii "\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357"
+        ascii = ascii "\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376\377"
+        # print ch
+        return index(ascii, ch)
+}
+
+function die(message, errnum, now)
 {
         print(message) > "/dev/stderr"
         dead = errnum
+        if (now) {
+                exit errnum
+        }
 }
 
 function eprint(message, suppress_newline)
@@ -177,9 +207,9 @@ function eprint(message, suppress_newline)
 function getchar()
 {
         system("stty raw")
-        cmd = "dd bs=1 count=1 2>/dev/null"
-        cmd | getline ch
-        close(cmd)
+        chcmd = "dd bs=1 count=1 2>/dev/null"
+        chcmd | getline ch
+        close(chcmd)
         system("stty cooked")
         return ch
 }
@@ -236,6 +266,11 @@ function process_commandline()
                         BF_MODE = "brainfuck"
                         BF_MODE_FORCE = 1
                         delete ARGV[a]
+                } else if (ARGV[a] == "-q" || ARGV[a] == "--quiet") {
+                        BF_OUTPUT = "/dev/null"
+                        delete ARGV[a]
+                } else if (ARGV[a] ~ /^-/) {
+                        die("Unknown option '" ARGV[a] "'", ERR_ARGUMENT, 1)
                 }
         }
         if (! BF_MODE_FORCE) {