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ppxlib-pp-ast can be used on files but it can also read from stdin:
$ cat > test.ml << EOF
> let x = x + 2
> EOF
$ cat test.ml | ppxlib-pp-ast --str -
[ Pstr_value
( Nonrecursive
, [ { pvb_pat = Ppat_var "x"
; pvb_expr =
Pexp_apply
( Pexp_ident (Lident "+")
, [ ( Nolabel, Pexp_ident (Lident "x"))
; ( Nolabel, Pexp_constant (Pconst_integer ( "2", None)))
]
)
; pvb_constraint = None
; pvb_attributes = __attrs
; pvb_loc = __loc
}
]
)
]
It can also read the input directly from the command line:
$ ppxlib-pp-ast --exp "x + 2"
Pexp_apply
( Pexp_ident (Lident "+")
, [ ( Nolabel, Pexp_ident (Lident "x"))
; ( Nolabel, Pexp_constant (Pconst_integer ( "2", None)))
]
)
Note that the kind must be specified when the input is not a file:
$ ppxlib-pp-ast "x + 2"
ppxlib-pp-ast: Could not guess kind from input "x + 2". Please use relevant CLI flag.
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