Always display the line number in file excerpts

src/errors.ml

@@ -63,6 +63,9 @@ let file_lines path ~start ~stop =
       aux [] 1
     )
 
+let pp_line padding_width pp (lnum, l) =
+  Format.fprintf pp "%*s | %s\n" padding_width lnum l
+
 let print ppf loc =
   let { Loc.start; stop } = loc in
   let start_c = start.pos_cnum - start.pos_bol in
@@ -73,11 +76,15 @@ let print ppf loc =
     if not whole_file then
       let path = Path.of_string start.pos_fname in
       if Path.exists path then
-        let line = file_line path start.pos_lnum in
+        let line_num = start.pos_lnum in
+        let line_num_str = string_of_int line_num in
+        let padding_width = String.length line_num_str in
+        let line = file_line path line_num in
         if stop_c <= String.length line then
           let len = stop_c - start_c in
-          Format.fprintf pp "%s\n%*s\n" line
-            stop_c
+          Format.fprintf pp "%a%*s\n"
+            (pp_line padding_width) (line_num_str, line)
+            (stop_c + padding_width + 3)
             (String.make len '^')
         else
           let get_padding lines =
@@ -93,7 +100,7 @@ let print ppf loc =
           in
           let print_lines lines padding_width =
             List.iter ~f:(fun (lnum, l) ->
-              Format.fprintf pp "%*s | %s\n" padding_width lnum l) lines;
+              pp_line padding_width pp (lnum, l)) lines;
           in
           if num_lines <= max_lines_to_print_in_full then
             let lines = file_lines path ~start:start.pos_lnum ~stop:stop.pos_lnum in

test/blackbox-tests/test-cases/bad-alias-error/run.t

@@ -1,15 +1,15 @@
   $ dune runtest --root absolute-path
   Entering directory 'absolute-path'
   File "jbuild", line 3, characters 16-24:
-    (deps ((alias /foo/bar)))))
-                  ^^^^^^^^
+  3 |   (deps ((alias /foo/bar)))))
+                      ^^^^^^^^
   Error: Invalid alias!
   Tried to reference path outside build dir: "/foo/bar"
   [1]
   $ dune runtest --root outside-workspace
   Entering directory 'outside-workspace'
   File "jbuild", line 4, characters 16-39:
-    (deps ((alias ${ROOT}/../../../foobar)))))
-                  ^^^^^^^^^^^^^^^^^^^^^^^
+  4 |   (deps ((alias ${ROOT}/../../../foobar)))))
+                      ^^^^^^^^^^^^^^^^^^^^^^^
   Error: path outside the workspace: ./../../../foobar from default
   [1]

test/blackbox-tests/test-cases/dune-jbuild-var-case/run.t

@@ -6,8 +6,8 @@ All builtin variables are lower cased in Dune:
   $ dune runtest --root dune-upper
   Entering directory 'dune-upper'
   File "dune", line 3, characters 41-46:
-   (action (with-stdout-to %{null} (echo %{MAKE}))))
-                                           ^^^^^
+  3 |  (action (with-stdout-to %{null} (echo %{MAKE}))))
+                                               ^^^^^
   Error: %{MAKE} was renamed to '%{make}' in the 1.0 version of the dune language
   [1]
 

test/blackbox-tests/test-cases/dune-ppx-driver-system/run.t

@@ -2,17 +2,17 @@ No ppx driver found
 
   $ dune build foo1.cma
   File "dune", line 6, characters 13-18:
-   (preprocess (pps)))
-               ^^^^^
+  6 |  (preprocess (pps)))
+                   ^^^^^
   Error: You must specify at least one ppx rewriter.
   [1]
 
 Too many drivers
 
   $ dune build foo2.cma
   File "dune", line 13, characters 13-28:
-   (preprocess (pps ppx1 ppx2)))
-               ^^^^^^^^^^^^^^^
+  13 |  (preprocess (pps ppx1 ppx2)))
+                    ^^^^^^^^^^^^^^^
   Error: Too many incompatible ppx drivers were found: foo.driver2 and
   foo.driver1.
   [1]
@@ -21,8 +21,8 @@ Not compatible with Dune
 
   $ dune build foo3.cma
   File "dune", line 20, characters 13-28:
-   (preprocess (pps ppx_other)))
-               ^^^^^^^^^^^^^^^
+  20 |  (preprocess (pps ppx_other)))
+                    ^^^^^^^^^^^^^^^
   Error: No ppx driver were found. It seems that ppx_other is not compatible
   with Dune. Examples of ppx rewriters that are compatible with Dune are ones
   using ocaml-migrate-parsetree, ppxlib or ppx_driver.

test/blackbox-tests/test-cases/dup-fields/run.t

@@ -5,8 +5,8 @@ Duplicating a field in a dune file is an error:
 
   $ dune build --root dune
   File "dune", line 4, characters 1-20:
-   (action (echo bar)))
-   ^^^^^^^^^^^^^^^^^^^
+  4 |  (action (echo bar)))
+       ^^^^^^^^^^^^^^^^^^^
   Error: Field "action" is present too many times
   [1]
 
@@ -17,8 +17,8 @@ For backward compatibility, it is only a warning in jbuild files:
 
   $ dune build --root jbuild
   File "jbuild", line 4, characters 2-21:
-    (action (echo bar))))
-    ^^^^^^^^^^^^^^^^^^^
+  4 |   (action (echo bar))))
+        ^^^^^^^^^^^^^^^^^^^
   Warning: Field "action" is present several times, previous occurrences are ignored.
   Entering directory 'jbuild'
   bar

test/blackbox-tests/test-cases/exclude-missing-module/run.t

@@ -1,5 +1,5 @@
   $ dune build --display short
   File "dune", line 3, characters 22-26:
-   (modules :standard \ fake))
-                        ^^^^
+  3 |  (modules :standard \ fake))
+                            ^^^^
   Warning: Module Fake is excluded but it doesn't exist.

test/blackbox-tests/test-cases/exec-missing/run.t

@@ -2,8 +2,8 @@ When using dune exec, the external-lib-deps command refers to the executable:
 
   $ dune exec ./x.exe
   File "dune", line 3, characters 12-26:
-   (libraries does-not-exist))
-              ^^^^^^^^^^^^^^
+  3 |  (libraries does-not-exist))
+                  ^^^^^^^^^^^^^^
   Error: Library "does-not-exist" not found.
   Hint: try: dune external-lib-deps --missing ./x.exe
   [1]

test/blackbox-tests/test-cases/fallback-dune/run.t

@@ -2,17 +2,17 @@ fallback isn't allowed in dune
 
   $ dune build --root dune1
   File "dune", line 2, characters 1-11:
-   (fallback)
-   ^^^^^^^^^^
+  2 |  (fallback)
+       ^^^^^^^^^^
   Error: 'fallback' was renamed to '(mode fallback)' in the 1.0 version of the dune language
   [1]
 
 2nd fallback form isn't allowed either
 
   $ dune build --root dune2
   File "dune", line 2, characters 1-17:
-   (fallback false)
-   ^^^^^^^^^^^^^^^^
+  2 |  (fallback false)
+       ^^^^^^^^^^^^^^^^
   Error: 'fallback' was renamed to '(mode fallback)' in the 1.0 version of the dune language
   [1]
 

test/blackbox-tests/test-cases/findlib-error/run.t

@@ -3,8 +3,8 @@ We are dropping support for findlib in dune
   $ dune build --root in-dune target.txt
   Entering directory 'in-dune'
   File "dune", line 2, characters 25-37:
-  (write-file target.txt %{findlib:pkg})
-                           ^^^^^^^^^^^^
+  2 | (write-file target.txt %{findlib:pkg})
+                               ^^^^^^^^^^^^
   Error: %{findlib:..} was renamed to '%{lib:..}' in the 1.0 version of the dune language
   [1]
 
@@ -13,7 +13,7 @@ But it must still be available in jbuild files
   $ dune build --root in-jbuild target.txt
   Entering directory 'in-jbuild'
   File "jbuild", line 4, characters 23-42:
-  (write-file target.txt ${findlib:pkg:file})
-                         ^^^^^^^^^^^^^^^^^^^
+  4 | (write-file target.txt ${findlib:pkg:file})
+                             ^^^^^^^^^^^^^^^^^^^
   Error: Public library "pkg" not found
   [1]

test/blackbox-tests/test-cases/findlib/run.t

@@ -8,8 +8,8 @@ Reproduction case for #484. The error should point to src/jbuild
 
   $ dune build @install
   File "src/dune", line 4, characters 14-15:
-   (libraries   a b c))
-                ^
+  4 |  (libraries   a b c))
+                    ^
   Error: Library "a" not found.
   Hint: try: dune external-lib-deps --missing @install
   [1]
@@ -18,8 +18,8 @@ When passing --dev, the profile should be displayed only once (#1106):
 
   $ jbuilder build --dev @install
   File "src/dune", line 4, characters 14-15:
-   (libraries   a b c))
-                ^
+  4 |  (libraries   a b c))
+                    ^
   Error: Library "a" not found.
   Hint: try: dune external-lib-deps --missing --profile dev @install
   [1]
@@ -28,8 +28,8 @@ With dune and an explicit profile, it is the same:
 
   $ dune build --profile dev @install
   File "src/dune", line 4, characters 14-15:
-   (libraries   a b c))
-                ^
+  4 |  (libraries   a b c))
+                    ^
   Error: Library "a" not found.
   Hint: try: dune external-lib-deps --missing --profile dev @install
   [1]

test/blackbox-tests/test-cases/github1099/run.t

@@ -3,8 +3,8 @@ If the source directory does not exist, an error message is printed:
   $ dune build --root no-dir demo.exe
   Entering directory 'no-dir'
   File "dune", line 1, characters 13-23:
-  (copy_files# "no_dir/*")
-               ^^^^^^^^^^
+  1 | (copy_files# "no_dir/*")
+                   ^^^^^^^^^^
   Error: cannot find directory: no_dir
   [1]
 
@@ -13,7 +13,7 @@ This works also is a file exists with the same name:
   $ dune build --root file-with-same-name demo.exe
   Entering directory 'file-with-same-name'
   File "dune", line 1, characters 13-23:
-  (copy_files# "no_dir/*")
-               ^^^^^^^^^^
+  1 | (copy_files# "no_dir/*")
+                   ^^^^^^^^^^
   Error: cannot find directory: no_dir
   [1]

test/blackbox-tests/test-cases/github644/run.t

@@ -1,7 +1,7 @@
   $ dune runtest
   File "jbuild", line 4, characters 20-42:
-    (preprocess (pps (ppx_that_doesn't_exist)))))
-                      ^^^^^^^^^^^^^^^^^^^^^^
+  4 |   (preprocess (pps (ppx_that_doesn't_exist)))))
+                          ^^^^^^^^^^^^^^^^^^^^^^
   Error: Library "ppx_that_doesn't_exist" not found.
   Hint: try: dune external-lib-deps --missing @runtest
   [1]

test/blackbox-tests/test-cases/github734/run.t

@@ -1,6 +1,6 @@
   $ jbuilder build @foo
   File "src/dune", line 4, characters 10-17:
-   (c_names stubs/x))
-            ^^^^^^^
+  4 |  (c_names stubs/x))
+                ^^^^^^^
   Error: File src/stubs/x.c is not part of the current directory group. This is not allowed.
   [1]

test/blackbox-tests/test-cases/github761/run.t

@@ -1,6 +1,6 @@
   $ jbuilder build @bar
   File "dune", line 2, characters 7-14:
-   (name foo/bar)
-         ^^^^^^^
+  2 |  (name foo/bar)
+             ^^^^^^^
   Error: "foo/bar" is not a valid alias name
   [1]

test/blackbox-tests/test-cases/github784/run.t

@@ -1,6 +1,6 @@
   $ dune build
   File "dune", line 1, characters 0-28:
-  (rule (run %{bin:echo} foo))
-  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  1 | (rule (run %{bin:echo} foo))
+      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   Error: Rule has no targets specified
   [1]

test/blackbox-tests/test-cases/github992/run.t

@@ -17,13 +17,13 @@ argument of "package".
 
   $ cd package-without-pub-name && dune build -p foo
   File "dune", line 3, characters 1-14:
-   (package foo))
-   ^^^^^^^^^^^^^
+  3 |  (package foo))
+       ^^^^^^^^^^^^^
   Error: This field is useless without a (public_name ...) field.
   [1]
 
   $ cd package-without-pub-name-jbuild && dune build -p foo
   File "jbuild", line 3, characters 2-15:
-    (package foo)))
-    ^^^^^^^^^^^^^
+  3 |   (package foo)))
+        ^^^^^^^^^^^^^
   Warning: This field is useless without a (public_name ...) field.

test/blackbox-tests/test-cases/include-loop/run.t

@@ -1,7 +1,7 @@
   $ dune build --display short
   File "dune", line 1, characters 0-15:
-  (include a.inc)
-  ^^^^^^^^^^^^^^^
+  1 | (include a.inc)
+      ^^^^^^^^^^^^^^^
   Error: Recursive inclusion of jbuild files detected:
   File a.inc is included from c.inc:1
   --> included from b.inc:1

test/blackbox-tests/test-cases/inline_tests/run.t

@@ -6,15 +6,15 @@
 
   $ dune runtest missing-backend
   File "missing-backend/dune", line 3, characters 1-15:
-   (inline_tests))
-   ^^^^^^^^^^^^^^
+  3 |  (inline_tests))
+       ^^^^^^^^^^^^^^
   Error: No inline tests backend found.
   [1]
 
   $ dune runtest too-many-backends
   File "too-many-backends/dune", line 17, characters 1-15:
-   (inline_tests)
-   ^^^^^^^^^^^^^^
+  17 |  (inline_tests)
+        ^^^^^^^^^^^^^^
   Error: Too many independent inline tests backends found:
   - "backend_tmb1" in _build/default/too-many-backends
   - "backend_tmb2" in _build/default/too-many-backends

test/blackbox-tests/test-cases/intf-only/run.t

@@ -37,8 +37,8 @@ Errors:
   $ dune build --display short --root b foo.cma
   Entering directory 'b'
   File "dune", line 3, characters 33-34:
-   (modules_without_implementation x))
-                                   ^
+  3 |  (modules_without_implementation x))
+                                       ^
   Warning: The following modules must be listed here as they don't have an implementation:
   - y
   This will become an error in the future.
@@ -47,14 +47,14 @@ Errors:
   $ dune build --display short --root c foo.cma
   Entering directory 'c'
   File "dune", line 3, characters 33-34:
-   (modules_without_implementation x))
-                                   ^
+  3 |  (modules_without_implementation x))
+                                       ^
   Error: Module X doesn't exist.
   [1]
   $ dune build --display short --root d foo.cma
   Entering directory 'd'
   File "dune", line 3, characters 33-34:
-   (modules_without_implementation x))
-                                   ^
+  3 |  (modules_without_implementation x))
+                                       ^
   Error: Module X has an implementation, it cannot be listed here
   [1]

test/blackbox-tests/test-cases/macro-expand-error/run.t

@@ -3,7 +3,7 @@ inappropariate place:
 
   $ dune build
   File "dune", line 1, characters 14-21:
-  (copy_files %{read:x}/*)
-                ^^^^^^^
+  1 | (copy_files %{read:x}/*)
+                    ^^^^^^^
   Error: %{read:..} isn't allowed in this position
   [1]

test/blackbox-tests/test-cases/misc/run.t

@@ -1,7 +1,7 @@
   $ dune runtest --display short
   File "dune", line 44, characters 19-42:
-   (deps (glob_files dir-that-doesnt-exist/*)))
-                     ^^^^^^^^^^^^^^^^^^^^^^^
+  44 |  (deps (glob_files dir-that-doesnt-exist/*)))
+                          ^^^^^^^^^^^^^^^^^^^^^^^
   Warning: Directory dir-that-doesnt-exist doesn't exist.
           diff alias runtest
           diff alias runtest

test/blackbox-tests/test-cases/missing-loc-run/run.t

@@ -14,8 +14,8 @@ Path that needs to be searched:
   $ dune runtest --root search-path
   Entering directory 'search-path'
   File "dune", line 3, characters 14-32:
-   (action (run foo-does-not-exist)))
-                ^^^^^^^^^^^^^^^^^^
+  3 |  (action (run foo-does-not-exist)))
+                    ^^^^^^^^^^^^^^^^^^
   Error: Error: Program foo-does-not-exist not found in the tree or in PATH (context: default)
   [1]