Guy Clark is the man.
This is the title track from the Dublin Blues CD
Townes Van Zandt also cut a version of this song.

Nothing fancy-

D (xx0232@1)                   G(add5)  DI (xx0232@1)wish I was in Austin
                    AIn (x02220@1)the Chili Parlour Bar
         DDrinkin' (xx0232@1)Mad Dog Margaritas
         G (320003@1)             DAnd (xx0232@1)not carin' where you are

D (xx0232@1)                     G(add5)  Dss
But here I sit in Dublin||
      A-i (x02220@1)Just rollin' cigarettes
DHoldin' (xx0232@1)back and chokin' back
      G (320003@1)              DThe (xx0232@1)shakes with every breath

CHORUS:
AForgive (x02220@1)me all my anger
   DForgive (xx0232@1)me all my faults
        AThere's (x02220@1)no need to forgive me
      DFor (xx0232@1)thinkin' what I though

AI (x02220@1)loved you from the git go
     DI'll (xx0232@1)love you till I die
   AI (x02220@1)loved you on the Spanish steps
     G (320003@1)              DThe (xx0232@1)day you said goodbye

I am just a poor boy
Work's my middle name
If money was a reason
I would not be the same

I'll stand up and be counted
I'll face up to the truth
I'll walk away from trouble
But I can't walk away from you

I have been to Fort Worth
I have been to Spain
I have been to proud
To come in out of the rain

I have seen the David
I've seen the Mona Lisa too
I have heard Doc Watson
Play Columbus Stockade Blues

Repeat Chorus and end with the first verse again.  
and that's all there is to it