prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Incorrect requirements.txt formatting in poetry export 
  The `requirements.txt` format needs to put a space in front of the semicolon that specifies the package and the pyversion and platform constraints.  Right now, without the space, the semicolon will be interpreted as part of a URL.  See this issue in `packaging`:
  https://github.com/pypa/packaging/issues/456
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `poetry/utils/exporter.py`
  Content:
  ```
  1 import urllib.parse
  2 
  3 from pathlib import Path
  4 from typing import Optional
  5 from typing import Sequence
  6 from typing import Union
  7 
  8 from cleo.io.io import IO
  9 
  10 from poetry.core.packages.utils.utils import path_to_url
  11 from poetry.poetry import Poetry
  12 from poetry.utils._compat import decode
  13 
  14 
  15 class Exporter:
  16     """
  17     Exporter class to export a lock file to alternative formats.
  18     """
  19 
  20     FORMAT_REQUIREMENTS_TXT = "requirements.txt"
  21     #: The names of the supported export formats.
  22     ACCEPTED_FORMATS = (FORMAT_REQUIREMENTS_TXT,)
  23     ALLOWED_HASH_ALGORITHMS = ("sha256", "sha384", "sha512")
  24 
  25     def __init__(self, poetry: Poetry) -> None:
  26         self._poetry = poetry
  27 
  28     def export(
  29         self,
  30         fmt: str,
  31         cwd: Path,
  32         output: Union[IO, str],
  33         with_hashes: bool = True,
  34         dev: bool = False,
  35         extras: Optional[Union[bool, Sequence[str]]] = None,
  36         with_credentials: bool = False,
  37     ) -> None:
  38         if fmt not in self.ACCEPTED_FORMATS:
  39             raise ValueError(f"Invalid export format: {fmt}")
  40 
  41         getattr(self, "_export_{}".format(fmt.replace(".", "_")))(
  42             cwd,
  43             output,
  44             with_hashes=with_hashes,
  45             dev=dev,
  46             extras=extras,
  47             with_credentials=with_credentials,
  48         )
  49 
  50     def _export_requirements_txt(
  51         self,
  52         cwd: Path,
  53         output: Union[IO, str],
  54         with_hashes: bool = True,
  55         dev: bool = False,
  56         extras: Optional[Union[bool, Sequence[str]]] = None,
  57         with_credentials: bool = False,
  58     ) -> None:
  59         indexes = set()
  60         content = ""
  61         dependency_lines = set()
  62 
  63         for dependency_package in self._poetry.locker.get_project_dependency_packages(
  64             project_requires=self._poetry.package.all_requires, dev=dev, extras=extras
  65         ):
  66             line = ""
  67 
  68             dependency = dependency_package.dependency
  69             package = dependency_package.package
  70 
  71             if package.develop:
  72                 line += "-e "
  73 
  74             requirement = dependency.to_pep_508(with_extras=False)
  75             is_direct_local_reference = (
  76                 dependency.is_file() or dependency.is_directory()
  77             )
  78             is_direct_remote_reference = dependency.is_vcs() or dependency.is_url()
  79 
  80             if is_direct_remote_reference:
  81                 line = requirement
  82             elif is_direct_local_reference:
  83                 dependency_uri = path_to_url(dependency.source_url)
  84                 line = f"{dependency.name} @ {dependency_uri}"
  85             else:
  86                 line = f"{package.name}=={package.version}"
  87 
  88             if not is_direct_remote_reference:
  89                 if ";" in requirement:
  90                     markers = requirement.split(";", 1)[1].strip()
  91                     if markers:
  92                         line += f"; {markers}"
  93 
  94             if (
  95                 not is_direct_remote_reference
  96                 and not is_direct_local_reference
  97                 and package.source_url
  98             ):
  99                 indexes.add(package.source_url)
  100 
  101             if package.files and with_hashes:
  102                 hashes = []
  103                 for f in package.files:
  104                     h = f["hash"]
  105                     algorithm = "sha256"
  106                     if ":" in h:
  107                         algorithm, h = h.split(":")
  108 
  109                         if algorithm not in self.ALLOWED_HASH_ALGORITHMS:
  110                             continue
  111 
  112                     hashes.append(f"{algorithm}:{h}")
  113 
  114                 if hashes:
  115                     line += " \\\n"
  116                     for i, h in enumerate(hashes):
  117                         line += "    --hash={}{}".format(
  118                             h, " \\\n" if i < len(hashes) - 1 else ""
  119                         )
  120             dependency_lines.add(line)
  121 
  122         content += "\n".join(sorted(dependency_lines))
  123         content += "\n"
  124 
  125         if indexes:
  126             # If we have extra indexes, we add them to the beginning of the output
  127             indexes_header = ""
  128             for index in sorted(indexes):
  129                 repositories = [
  130                     r
  131                     for r in self._poetry.pool.repositories
  132                     if r.url == index.rstrip("/")
  133                 ]
  134                 if not repositories:
  135                     continue
  136                 repository = repositories[0]
  137                 if (
  138                     self._poetry.pool.has_default()
  139                     and repository is self._poetry.pool.repositories[0]
  140                 ):
  141                     url = (
  142                         repository.authenticated_url
  143                         if with_credentials
  144                         else repository.url
  145                     )
  146                     indexes_header = f"--index-url {url}\n"
  147                     continue
  148 
  149                 url = (
  150                     repository.authenticated_url if with_credentials else repository.url
  151                 )
  152                 parsed_url = urllib.parse.urlsplit(url)
  153                 if parsed_url.scheme == "http":
  154                     indexes_header += f"--trusted-host {parsed_url.netloc}\n"
  155                 indexes_header += f"--extra-index-url {url}\n"
  156 
  157             content = indexes_header + "\n" + content
  158 
  159         self._output(content, cwd, output)
  160 
  161     def _output(self, content: str, cwd: Path, output: Union[IO, str]) -> None:
  162         decoded = decode(content)
  163         try:
  164             output.write(decoded)
  165         except AttributeError:
  166             filepath = cwd / output
  167             with filepath.open("w", encoding="utf-8") as f:
  168                 f.write(decoded)
  169
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/poetry/utils/exporter.py b/poetry/utils/exporter.py
  --- a/poetry/utils/exporter.py
  +++ b/poetry/utils/exporter.py
  @@ -89,7 +89,7 @@
                   if ";" in requirement:
                       markers = requirement.split(";", 1)[1].strip()
                       if markers:
  -                        line += f"; {markers}"
  +                        line += f" ; {markers}"
   
               if (
                   not is_direct_remote_reference
  
verification_info: {"golden_diff": "diff --git a/poetry/utils/exporter.py b/poetry/utils/exporter.py\n--- a/poetry/utils/exporter.py\n+++ b/poetry/utils/exporter.py\n@@ -89,7 +89,7 @@\n                 if \";\" in requirement:\n                     markers = requirement.split(\";\", 1)[1].strip()\n                     if markers:\n-                        line += f\"; {markers}\"\n+                        line += f\" ; {markers}\"\n \n             if (\n                 not is_direct_remote_reference\n", "issue": "Incorrect requirements.txt formatting in poetry export \nThe `requirements.txt` format needs to put a space in front of the semicolon that specifies the package and the pyversion and platform constraints.  Right now, without the space, the semicolon will be interpreted as part of a URL.  See this issue in `packaging`:\r\nhttps://github.com/pypa/packaging/issues/456\n", "before_files": [{"content": "import urllib.parse\n\nfrom pathlib import Path\nfrom typing import Optional\nfrom typing import Sequence\nfrom typing import Union\n\nfrom cleo.io.io import IO\n\nfrom poetry.core.packages.utils.utils import path_to_url\nfrom poetry.poetry import Poetry\nfrom poetry.utils._compat import decode\n\n\nclass Exporter:\n    \"\"\"\n    Exporter class to export a lock file to alternative formats.\n    \"\"\"\n\n    FORMAT_REQUIREMENTS_TXT = \"requirements.txt\"\n    #: The names of the supported export formats.\n    ACCEPTED_FORMATS = (FORMAT_REQUIREMENTS_TXT,)\n    ALLOWED_HASH_ALGORITHMS = (\"sha256\", \"sha384\", \"sha512\")\n\n    def __init__(self, poetry: Poetry) -> None:\n        self._poetry = poetry\n\n    def export(\n        self,\n        fmt: str,\n        cwd: Path,\n        output: Union[IO, str],\n        with_hashes: bool = True,\n        dev: bool = False,\n        extras: Optional[Union[bool, Sequence[str]]] = None,\n        with_credentials: bool = False,\n    ) -> None:\n        if fmt not in self.ACCEPTED_FORMATS:\n            raise ValueError(f\"Invalid export format: {fmt}\")\n\n        getattr(self, \"_export_{}\".format(fmt.replace(\".\", \"_\")))(\n            cwd,\n            output,\n            with_hashes=with_hashes,\n            dev=dev,\n            extras=extras,\n            with_credentials=with_credentials,\n        )\n\n    def _export_requirements_txt(\n        self,\n        cwd: Path,\n        output: Union[IO, str],\n        with_hashes: bool = True,\n        dev: bool = False,\n        extras: Optional[Union[bool, Sequence[str]]] = None,\n        with_credentials: bool = False,\n    ) -> None:\n        indexes = set()\n        content = \"\"\n        dependency_lines = set()\n\n        for dependency_package in self._poetry.locker.get_project_dependency_packages(\n            project_requires=self._poetry.package.all_requires, dev=dev, extras=extras\n        ):\n            line = \"\"\n\n            dependency = dependency_package.dependency\n            package = dependency_package.package\n\n            if package.develop:\n                line += \"-e \"\n\n            requirement = dependency.to_pep_508(with_extras=False)\n            is_direct_local_reference = (\n                dependency.is_file() or dependency.is_directory()\n            )\n            is_direct_remote_reference = dependency.is_vcs() or dependency.is_url()\n\n            if is_direct_remote_reference:\n                line = requirement\n            elif is_direct_local_reference:\n                dependency_uri = path_to_url(dependency.source_url)\n                line = f\"{dependency.name} @ {dependency_uri}\"\n            else:\n                line = f\"{package.name}=={package.version}\"\n\n            if not is_direct_remote_reference:\n                if \";\" in requirement:\n                    markers = requirement.split(\";\", 1)[1].strip()\n                    if markers:\n                        line += f\"; {markers}\"\n\n            if (\n                not is_direct_remote_reference\n                and not is_direct_local_reference\n                and package.source_url\n            ):\n                indexes.add(package.source_url)\n\n            if package.files and with_hashes:\n                hashes = []\n                for f in package.files:\n                    h = f[\"hash\"]\n                    algorithm = \"sha256\"\n                    if \":\" in h:\n                        algorithm, h = h.split(\":\")\n\n                        if algorithm not in self.ALLOWED_HASH_ALGORITHMS:\n                            continue\n\n                    hashes.append(f\"{algorithm}:{h}\")\n\n                if hashes:\n                    line += \" \\\\\\n\"\n                    for i, h in enumerate(hashes):\n                        line += \"    --hash={}{}\".format(\n                            h, \" \\\\\\n\" if i < len(hashes) - 1 else \"\"\n                        )\n            dependency_lines.add(line)\n\n        content += \"\\n\".join(sorted(dependency_lines))\n        content += \"\\n\"\n\n        if indexes:\n            # If we have extra indexes, we add them to the beginning of the output\n            indexes_header = \"\"\n            for index in sorted(indexes):\n                repositories = [\n                    r\n                    for r in self._poetry.pool.repositories\n                    if r.url == index.rstrip(\"/\")\n                ]\n                if not repositories:\n                    continue\n                repository = repositories[0]\n                if (\n                    self._poetry.pool.has_default()\n                    and repository is self._poetry.pool.repositories[0]\n                ):\n                    url = (\n                        repository.authenticated_url\n                        if with_credentials\n                        else repository.url\n                    )\n                    indexes_header = f\"--index-url {url}\\n\"\n                    continue\n\n                url = (\n                    repository.authenticated_url if with_credentials else repository.url\n                )\n                parsed_url = urllib.parse.urlsplit(url)\n                if parsed_url.scheme == \"http\":\n                    indexes_header += f\"--trusted-host {parsed_url.netloc}\\n\"\n                indexes_header += f\"--extra-index-url {url}\\n\"\n\n            content = indexes_header + \"\\n\" + content\n\n        self._output(content, cwd, output)\n\n    def _output(self, content: str, cwd: Path, output: Union[IO, str]) -> None:\n        decoded = decode(content)\n        try:\n            output.write(decoded)\n        except AttributeError:\n            filepath = cwd / output\n            with filepath.open(\"w\", encoding=\"utf-8\") as f:\n                f.write(decoded)\n", "path": "poetry/utils/exporter.py"}], "after_files": [{"content": "import urllib.parse\n\nfrom pathlib import Path\nfrom typing import Optional\nfrom typing import Sequence\nfrom typing import Union\n\nfrom cleo.io.io import IO\n\nfrom poetry.core.packages.utils.utils import path_to_url\nfrom poetry.poetry import Poetry\nfrom poetry.utils._compat import decode\n\n\nclass Exporter:\n    \"\"\"\n    Exporter class to export a lock file to alternative formats.\n    \"\"\"\n\n    FORMAT_REQUIREMENTS_TXT = \"requirements.txt\"\n    #: The names of the supported export formats.\n    ACCEPTED_FORMATS = (FORMAT_REQUIREMENTS_TXT,)\n    ALLOWED_HASH_ALGORITHMS = (\"sha256\", \"sha384\", \"sha512\")\n\n    def __init__(self, poetry: Poetry) -> None:\n        self._poetry = poetry\n\n    def export(\n        self,\n        fmt: str,\n        cwd: Path,\n        output: Union[IO, str],\n        with_hashes: bool = True,\n        dev: bool = False,\n        extras: Optional[Union[bool, Sequence[str]]] = None,\n        with_credentials: bool = False,\n    ) -> None:\n        if fmt not in self.ACCEPTED_FORMATS:\n            raise ValueError(f\"Invalid export format: {fmt}\")\n\n        getattr(self, \"_export_{}\".format(fmt.replace(\".\", \"_\")))(\n            cwd,\n            output,\n            with_hashes=with_hashes,\n            dev=dev,\n            extras=extras,\n            with_credentials=with_credentials,\n        )\n\n    def _export_requirements_txt(\n        self,\n        cwd: Path,\n        output: Union[IO, str],\n        with_hashes: bool = True,\n        dev: bool = False,\n        extras: Optional[Union[bool, Sequence[str]]] = None,\n        with_credentials: bool = False,\n    ) -> None:\n        indexes = set()\n        content = \"\"\n        dependency_lines = set()\n\n        for dependency_package in self._poetry.locker.get_project_dependency_packages(\n            project_requires=self._poetry.package.all_requires, dev=dev, extras=extras\n        ):\n            line = \"\"\n\n            dependency = dependency_package.dependency\n            package = dependency_package.package\n\n            if package.develop:\n                line += \"-e \"\n\n            requirement = dependency.to_pep_508(with_extras=False)\n            is_direct_local_reference = (\n                dependency.is_file() or dependency.is_directory()\n            )\n            is_direct_remote_reference = dependency.is_vcs() or dependency.is_url()\n\n            if is_direct_remote_reference:\n                line = requirement\n            elif is_direct_local_reference:\n                dependency_uri = path_to_url(dependency.source_url)\n                line = f\"{dependency.name} @ {dependency_uri}\"\n            else:\n                line = f\"{package.name}=={package.version}\"\n\n            if not is_direct_remote_reference:\n                if \";\" in requirement:\n                    markers = requirement.split(\";\", 1)[1].strip()\n                    if markers:\n                        line += f\" ; {markers}\"\n\n            if (\n                not is_direct_remote_reference\n                and not is_direct_local_reference\n                and package.source_url\n            ):\n                indexes.add(package.source_url)\n\n            if package.files and with_hashes:\n                hashes = []\n                for f in package.files:\n                    h = f[\"hash\"]\n                    algorithm = \"sha256\"\n                    if \":\" in h:\n                        algorithm, h = h.split(\":\")\n\n                        if algorithm not in self.ALLOWED_HASH_ALGORITHMS:\n                            continue\n\n                    hashes.append(f\"{algorithm}:{h}\")\n\n                if hashes:\n                    line += \" \\\\\\n\"\n                    for i, h in enumerate(hashes):\n                        line += \"    --hash={}{}\".format(\n                            h, \" \\\\\\n\" if i < len(hashes) - 1 else \"\"\n                        )\n            dependency_lines.add(line)\n\n        content += \"\\n\".join(sorted(dependency_lines))\n        content += \"\\n\"\n\n        if indexes:\n            # If we have extra indexes, we add them to the beginning of the output\n            indexes_header = \"\"\n            for index in sorted(indexes):\n                repositories = [\n                    r\n                    for r in self._poetry.pool.repositories\n                    if r.url == index.rstrip(\"/\")\n                ]\n                if not repositories:\n                    continue\n                repository = repositories[0]\n                if (\n                    self._poetry.pool.has_default()\n                    and repository is self._poetry.pool.repositories[0]\n                ):\n                    url = (\n                        repository.authenticated_url\n                        if with_credentials\n                        else repository.url\n                    )\n                    indexes_header = f\"--index-url {url}\\n\"\n                    continue\n\n                url = (\n                    repository.authenticated_url if with_credentials else repository.url\n                )\n                parsed_url = urllib.parse.urlsplit(url)\n                if parsed_url.scheme == \"http\":\n                    indexes_header += f\"--trusted-host {parsed_url.netloc}\\n\"\n                indexes_header += f\"--extra-index-url {url}\\n\"\n\n            content = indexes_header + \"\\n\" + content\n\n        self._output(content, cwd, output)\n\n    def _output(self, content: str, cwd: Path, output: Union[IO, str]) -> None:\n        decoded = decode(content)\n        try:\n            output.write(decoded)\n        except AttributeError:\n            filepath = cwd / output\n            with filepath.open(\"w\", encoding=\"utf-8\") as f:\n                f.write(decoded)\n", "path": "poetry/utils/exporter.py"}]}