1 files changed, 173 insertions, 0 deletions
diff --git a/bin/gen-cli-docs.py b/bin/gen-cli-docs.py
new file mode 100755
index 0000000..39e8a72
--- /dev/null
+++ b/bin/gen-cli-docs.py
@@ -0,0 +1,173 @@
+#!/usr/bin/env python3
+
+import argparse
+import subprocess
+import io
+import os
+import copy
+from pathlib import Path
+
+
+def _print_option(writable, option, description):
+    line = ' '.join(option)
+    print(f"- ``{line}``", file=writable)
+    print(file=writable)
+
+    line_buf = list()
+    description_cleaned = list()
+    for line in description:
+        if not line_buf:
+            line_buf = copy.deepcopy(line)
+            continue
+
+        if not line:
+            # empty line
+            if line_buf:
+                description_cleaned.append(line_buf)
+            description_cleaned.append(line)
+            line_buf = list()
+            continue
+
+        if line[0] == '*':
+            description_cleaned.append(line_buf)
+            line_buf = list()
+
+        line_buf.extend(line)
+
+    if line_buf:
+        description_cleaned.append(line_buf)
+
+    for line in description_cleaned:
+        if line and line[0] == '*':
+            line[0] = '-'
+            line = "  " + ' '.join(line)
+            print(f"  {line}", file=writable)
+            continue
+
+        print("  " + ' '.join(line), file=writable)
+
+    print(file=writable)
+
+
+def _parse_and_print(writable, cmd_name, lines):
+    print(cmd_name, file=writable)
+    print('=' * len(cmd_name), file=writable)
+    print(file=writable)
+
+    # Usage (1st line)
+    line = lines[0]
+    prefix = "Usage: "
+    if not line.startswith(prefix):
+        raise RuntimeError("invalid output")
+
+    cmd = line[len(prefix):]
+    print("Usage", file=writable)
+    print("-----", file=writable)
+    print(file=writable)
+    print(".. code-block::", file=writable)
+    print(file=writable)
+    print(f"   {cmd}", file=writable)
+    print(file=writable)
+
+    # Description (sentence block right below usage)
+    for i, line in enumerate(lines[2:]):
+        if line == "Options:":
+            break
+        print(line, file=writable)
+
+    # Allowed option title
+    lineno = i + 2
+    line = lines[lineno]
+    if not line or line[-1] != ':':
+        print(lines)
+        raise RuntimeError("invalid section title")
+
+    line = line[:-1]
+    print(line, file=writable)
+    print('-' * len(line), file=writable)
+    print(file=writable)
+
+    # Options
+    lineno += 1
+
+    # determine the first indent length from the first line.
+    indent = 0
+    while lines[lineno][indent] == ' ':
+        indent += 1
+
+    # determine the column position of the option description.
+    desc_pos = lines[lineno].find("Print this help.")
+    if desc_pos < 0:
+        raise RuntimeError("failed to parse the --help option line.")
+
+    option_buf = list()
+    desc_buf = list()
+    for line in lines[lineno:]:
+        if not line:
+            continue
+
+        option_s = line[indent:desc_pos]
+        desc_s = line[desc_pos:]
+
+        if option_s and option_s[0] == '-':
+            # start a new option. if the current buffer is not empty, flush it first.
+            if option_buf:
+                _print_option(writable, option_buf, desc_buf)
+
+            option_buf = option_s.split()
+            desc_buf = list()
+
+        desc_buf.append(desc_s.split())
+
+    if option_buf:
+        _print_option(writable, option_buf, desc_buf)
+
+
+def parse(cmd_dir, output_dir, cmd_name):
+    os.makedirs(output_dir, exist_ok=True)
+    cmd_path = cmd_dir / cmd_name
+    s = cmd_name.replace('-', '_')
+    output_path = output_dir / f"{s}.rst"
+    if not cmd_path.is_file():
+        raise RuntimeError(f"command not found: {cmd_path}")
+
+    output = subprocess.run([cmd_path, "-h"], stdout=subprocess.PIPE).stdout
+    output = output.decode("utf-8")
+    lines = output.split('\n')
+
+    with open(output_path, "w") as f:
+        _parse_and_print(f, cmd_name, lines)
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Parse the output from the cli help, and convert it to rst output.")
+    parser.add_argument(
+        "--cmd-dir", "-c", type=Path, required=True,
+        help="path to the directory where the orcus commands are.")
+    parser.add_argument(
+        "--output-dir", "-o", type=Path, required=True,
+        help="path to the output directory.")
+    args = parser.parse_args()
+
+    if not args.cmd_dir.is_dir():
+        raise RuntimeError(f"invalid command directory: {args.cmd_dir}")
+
+    cmds = (
+        "orcus-csv",
+        "orcus-ods",
+        "orcus-xlsx",
+        "orcus-gnumeric",
+        "orcus-json",
+        "orcus-xml",
+        "orcus-xls-xml",
+        "orcus-yaml",
+        "orcus-parquet",
+    )
+    for cmd in cmds:
+        parse(args.cmd_dir, args.output_dir, cmd)
+
+
+if __name__ == "__main__":
+    main()
+