Add navigation suggestion and file skeleton for view command

[ryanhoangt]

Description

This PR is to:

• Improve upon the existing view command implementation.

Some remaining TODOs:

• Max token control
• Symbol ranking to choose what to show

view command on a file path

{
    "command": "view", 
    "path": "/home/hoang/openhands-aci/openhands_aci/utils/shell.py"
}

New output with navigation suggestion

Here's the result of running `cat -n` on /home/hoang/openhands-aci/openhands_aci/
utils/shell.py:
     1  import os
     2  import subprocess
     3  import time
     4
     5  from openhands_aci.editor.config import MAX_RESPONSE_LEN_CHAR
     6  from openhands_aci.editor.results import maybe_truncate
     7
     8
     9  def run_shell_cmd(
    10      cmd: str,
    11      timeout: float | None = 120.0,  # seconds
    12      truncate_after: int | None = MAX_RESPONSE_LEN_CHAR,
    13  ) -> tuple[int, str, str]:
    14      """Run a shell command synchronously with a timeout.
    15
    16      Args:
    17          cmd: The shell command to run.
    18          timeout: The maximum time to wait for the command to complete.
    19          truncate_after: The maximum number of characters to return for stdout and stderr.
    20
    21      Returns:
    22          A tuple containing the return code, stdout, and stderr.
    23      """
    24
    25      start_time = time.time()
    26
    27      try:
    28          process = subprocess.Popen(
    29              cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True
    30          )
    31
    32          stdout, stderr = process.communicate(timeout=timeout)
    33
    34          return (
    35              process.returncode or 0,
    36              maybe_truncate(stdout, truncate_after=truncate_after),
    37              maybe_truncate(stderr, truncate_after=truncate_after),
    38          )
    39      except subprocess.TimeoutExpired:
    40          process.kill()
    41          elapsed_time = time.time() - start_time
    42          raise TimeoutError(
    43              f"Command '{cmd}' timed out after {elapsed_time:.2f} seconds"
    44          )
    45
    46
    47  def check_tool_installed(tool_name: str) -> bool:
    48      """Check if a tool is installed."""
    49      try:
    50          subprocess.run(
    51              [tool_name, '--version'],
    52              check=True,
    53              cwd=os.getcwd(),
    54              stdout=subprocess.PIPE,
    55              stderr=subprocess.PIPE,
    56          )
    57          return True
    58      except (subprocess.CalledProcessError, FileNotFoundError):
    59          return False
    60

Files that this file uses:
- openhands_aci/editor/results.py (via `maybe_truncate`)

Files that refer to this file:
- tests/unit/test_shell_utils.py (via `run_shell_cmd`, `check_tool_installed`)
- openhands_aci/linter/impl/python.py (via `run_shell_cmd`)
- openhands_aci/editor/editor.py (via `run_shell_cmd`)
<TIP>Use the `jump_to_definition` and `find_references` commands to understand 
more about those class, function/method and how they are used in the codebase.</TIP>

view command on a directory path

{
    "command": "view", 
    "path": "/home/hoang/openhands-aci/openhands_aci/utils"
}

New output with file skeleton

Here's the files with its skeleton (i.e., class, function/method signatures) and 
directories up to 2 levels deep in /home/hoang/openhands-aci/openhands_aci/utils, 
excluding hidden items:
/home/hoang/openhands-aci/openhands_aci/utils
/home/hoang/openhands-aci/openhands_aci/utils/file.py
...⋮...
  7│class GitRepoUtils:
  8│    def __init__(self, abs_repo_path: str) -> None:
  9│        from git import Repo
 10│
 11│        if not Path(abs_repo_path).is_absolute():
 12│            raise ValueError('The path must be absolute')
 13│
 14│        self.repo_path = Path(abs_repo_path)
 15│        try:
 16│            self.repo = Repo(self.repo_path)
 17│        except Exception:
...⋮...
 23│    def get_all_absolute_tracked_files(self, depth: int | None = None) -> list[str]:
...⋮...
 31│    def get_all_relative_tracked_files(self, depth: int | None = None) -> list[str]:
...⋮...
 39│    def get_all_absolute_staged_files(self) -> list[str]:
...⋮...
 44│    def get_absolute_tracked_files_in_directory(
 45│        self, rel_dir_path: str, depth: int | None = None
...⋮...
 57│def get_modified_time(abs_path: str) -> int:
...⋮...
 64│def read_text(abs_path: str) -> str:
...⋮...
/home/hoang/openhands-aci/openhands_aci/utils/shell.py
...⋮...
  9│def run_shell_cmd(
 10│    cmd: str,
 11│    timeout: float | None = 120.0,  # seconds
 12│    truncate_after: int | None = MAX_RESPONSE_LEN_CHAR,
...⋮...
 47│def check_tool_installed(tool_name: str) -> bool:
...⋮...
/home/hoang/openhands-aci/openhands_aci/utils/logger.py

/home/hoang/openhands-aci/openhands_aci/utils/diff.py
...⋮...
  6│def get_diff(old_contents: str, new_contents: str, filepath: str = 'file') -> str:
...⋮...
 21│def parse_diff(diff_patch: str) -> list[whatthepatch.patch.Change]:
...⋮...
/home/hoang/openhands-aci/openhands_aci/utils/__pycache__
/home/hoang/openhands-aci/openhands_aci/utils/__pycache__/path.cpython-312.pyc
/home/hoang/openhands-aci/openhands_aci/utils/__pycache__/shell.cpython-312.pyc
/home/hoang/openhands-aci/openhands_aci/utils/__pycache__/diff.cpython-312.pyc
/home/hoang/openhands-aci/openhands_aci/utils/__pycache__/file.cpython-312.pyc
/home/hoang/openhands-aci/openhands_aci/utils/__pycache__/logger.cpython-312.pyc
/home/hoang/openhands-aci/openhands_aci/utils/path.py
...⋮...
  4│class PathUtils:
  5│    def __init__(self, root: str) -> None:
...⋮...
  8│    def get_absolute_path_str(self, rel_path: str) -> str:
...⋮...
 11│    def get_relative_path_str(self, abs_path: str) -> str:
...⋮...
 14│    def get_depth_from_root(self, abs_path: str) -> int:
...⋮...
 18│def has_image_extension(path: str) -> bool:
...⋮...
 23│def get_depth_of_rel_path(rel_path: str) -> int:
...⋮...

Related Issue

This can be seen as an alternative to the original RepoMap. Progress towards All-Hands-AI/OpenHands#2185