Libreoffice impress

LibreOffice Impress

Use the bundled impress modules for UNO-backed Impress presentation work. All paths must be absolute. Bundled modules live under scripts/ in this skill directory, so set PYTHONPATH=<skill_base_dir>/scripts. If setup or runtime issues appear, check references/troubleshooting.md.

API Surface

# Non-session utilities
create_presentation(path)
get_slide_count(path)
export_presentation(path, output_path, export_format)   # formats: "pdf", "pptx"
snapshot_slide(doc_path, slide_index, output_path, width=1280, height=720)

# Session (primary editing API)
ImpressSession(path) -> context manager

ImpressSession methods:
  get_slide_count() -> int
  get_slide_inventory(target: ImpressTarget) -> dict[str, object]
  add_slide(index=None, layout="BLANK")
  delete_slide(target: ImpressTarget)
  move_slide(target: ImpressTarget, to_index)
  duplicate_slide(target: ImpressTarget)
  delete_item(target: ImpressTarget)
  read_text(target: ImpressTarget) -> str
  insert_text(text, target: ImpressTarget | None = None)
  replace_text(target: ImpressTarget, new_text)
  format_text(target: ImpressTarget, formatting: TextFormatting)
  insert_list(items: list[ListItem], ordered: bool, target: ImpressTarget | None = None)
  replace_list(target: ImpressTarget, items: list[ListItem], ordered: bool | None = None)
  insert_text_box(slide: ImpressTarget, text, placement: ShapePlacement, name=None)
  insert_shape(slide: ImpressTarget, shape_type, placement: ShapePlacement, fill_color=None, line_color=None, name=None)
  insert_image(slide: ImpressTarget, image_path, placement: ShapePlacement, name=None)
  replace_image(target: ImpressTarget, image_path=None, placement: ShapePlacement | None = None)
  insert_table(slide: ImpressTarget, rows, cols, placement: ShapePlacement, data=None, name=None)
  update_table(target: ImpressTarget, data)
  insert_chart(slide: ImpressTarget, chart_type, data, placement: ShapePlacement, title=None, name=None)
  update_chart(target: ImpressTarget, chart_type=None, data=None, placement: ShapePlacement | None = None, title=None)
  insert_media(slide: ImpressTarget, media_path, placement: ShapePlacement, name=None)
  replace_media(target: ImpressTarget, media_path=None, placement: ShapePlacement | None = None)
  set_notes(target: ImpressTarget, text)
  get_notes(target: ImpressTarget) -> str
  list_master_pages() -> list[str]
  apply_master_page(target: ImpressTarget, master_target: ImpressTarget)
  set_master_background(target: ImpressTarget, color)
  import_master_page(template_path) -> MasterPageImportResult
  patch(patch_text, mode="atomic") -> PatchApplyResult
  export(output_path, export_format)
  reset()
  close(save=True)

# Standalone patch utility
patch(path, patch_text, mode="atomic") -> PatchApplyResult

Structured Targets: ImpressTarget

from impress import ImpressTarget

ImpressTarget(
    kind=(
        "slide" | "shape" | "text" | "table" | "chart" |
        "media" | "notes" | "master_page" | "list" | "insertion" | "image"
    ),
    slide_index=None,
    shape_name=None,
    shape_index=None,
    shape_type=None,
    placeholder=None,
    text=None,
    after=None,
    before=None,
    occurrence=None,
    master_name=None,
)

Target kinds

Kind	Supported fields	Use
slide	slide_index	Slide inventory, deletion, move, duplicate, master-page application
shape	slide_index plus shape_name or shape_index	Read/delete one generic shape
image	slide_index plus shape_name or shape_index	Replace/delete one image
table	slide_index plus shape_name or shape_index	Update/delete one table
chart	slide_index plus shape_name or shape_index	Update/delete one chart
media	slide_index plus shape_name or shape_index	Replace/delete one media object
text	slide-scoped selectors plus text, after, before, occurrence	Read, replace, delete, or format text
list	slide-scoped text selectors	Replace/delete one structural list block
insertion	slide-scoped selectors plus anchors	Insert text or a list
notes	slide_index plus optional text bounds	Read or replace speaker notes
master_page	master_name	Resolve one master page

Resolution rules

• Slide indices are zero-based.
• shape_name and shape_index are mutually exclusive.
• placeholder targets support explicit values such as title, body, and subtitle.
• Use after and before to narrow text or list resolution inside one resolved text-bearing object.
• For object targets, prefer shape_name; use shape_index only when slide order is stable.
• delete_item() accepts any non-slide delete target: text, notes, list, shape, image, table, chart, or media.
• apply_master_page() supports per-slide targeting. This was verified against UNO by assigning a distinct master to one slide and confirming neighboring slides kept their previous masters.

Formatting Payload: TextFormatting

from impress import TextFormatting

TextFormatting(
    bold=None,
    italic=None,
    underline=None,
    font_name=None,
    font_size=None,
    color=None,          # named color or integer
    align=None,          # "left" | "center" | "right" | "justify" | "start" | "end"
)

Notes:

• At least one formatting field must be set.
• Color accepts a named color or 0xRRGGBB integer.
• Paragraph alignment is applied through the same formatting payload as character styling.

Geometry Payload: ShapePlacement

from impress import ShapePlacement

ShapePlacement(x_cm=1.0, y_cm=2.0, width_cm=8.0, height_cm=4.0)

• Geometry values are in centimetres.
• Width and height must be positive.

List Items

from impress import ListItem

ListItem(text="Confirm scope", level=0)

• level is zero-based nesting.
• Nesting cannot skip levels.
• List editing is structural; do not add manual - prefixes.
• Headless snapshot rendering may not visibly paint bullets even when list metadata is correct.

Patch DSL

Use patch() or session.patch() to apply ordered operations.

[operation]
type = replace_text
target.kind = text
target.slide_index = 2
target.placeholder = body
target.text = Quarterly revenue rose 18%
new_text = Quarterly revenue rose 21%

[operation]
type = insert_list
target.kind = insertion
target.slide_index = 2
target.shape_name = Agenda Box
target.after = Action Items
list.ordered = false
items <<JSON
[
  {"text": "Confirm scope", "level": 0},
  {"text": "Review outputs", "level": 0},
  {"text": "Update notes", "level": 1}
]
JSON

[operation]
type = delete_item
target.kind = chart
target.slide_index = 4
target.shape_name = Disposable Chart

Supported operation types

• add_slide
• delete_slide
• move_slide
• duplicate_slide
• insert_text
• replace_text
• format_text
• insert_list
• replace_list
• insert_text_box
• insert_shape
• delete_item
• insert_image
• replace_image
• insert_table
• update_table
• insert_chart
• update_chart
• insert_media
• replace_media
• set_notes
• apply_master_page
• set_master_background

Patch value rules

• Use target.* fields for the primary target.
• Use master.* fields for apply_master_page.
• Use format.* fields for TextFormatting.
• Use placement.* fields for ShapePlacement.
• Use list.ordered plus JSON items for list operations.
• items and data must be valid JSON.
• Heredoc blocks are supported with <<TAG ... TAG for multiline text or JSON.

Modes

• atomic stops on first failure, restores the original file bytes, and persists nothing.
• best_effort keeps successful earlier operations and records later failures.
• List operations participate correctly in atomic rollback because they no longer store/reset mid-operation.

PatchApplyResult fields:

• mode
• overall_status = "ok" | "partial" | "failed"
• operations = list of PatchOperationResult
• document_persisted

For standalone patch(path, ...), document_persisted means the changes were saved to disk. For session.patch(...), it means the patch produced successful mutations in the current open session state.

Example: Edit a Deck in Session

from pathlib import Path

from impress import (
    ImpressSession,
    ImpressTarget,
    ListItem,
    ShapePlacement,
    TextFormatting,
)
from impress.core import create_presentation

output = str(Path("test-output/demo.odp").resolve())
create_presentation(output)

with ImpressSession(output) as session:
    session.add_slide(layout="TITLE_AND_CONTENT")
    session.replace_text(
        ImpressTarget(kind="text", slide_index=1, placeholder="title"),
        "Executive Summary",
    )
    session.replace_text(
        ImpressTarget(kind="text", slide_index=1, placeholder="body"),
        "Quarterly revenue rose 18%.",
    )
    session.insert_text_box(
        ImpressTarget(kind="slide", slide_index=1),
        "Action Items",
        ShapePlacement(1.0, 5.0, 10.0, 4.0),
        name="Agenda Box",
    )
    session.insert_list(
        [
            ListItem(text="Confirm scope", level=0),
            ListItem(text="Review output", level=0),
            ListItem(text="Update packaging", level=1),
        ],
        ordered=False,
        target=ImpressTarget(
            kind="insertion",
            slide_index=1,
            shape_name="Agenda Box",
            after="Action Items",
        ),
    )
    session.format_text(
        ImpressTarget(
            kind="text",
            slide_index=1,
            placeholder="body",
            text="Quarterly revenue rose 18%.",
        ),
        TextFormatting(bold=True, align="center"),
    )

Example: Patch an Existing Presentation

from impress import patch

result = patch(
    "/abs/path/demo.odp",
    """
    [operation]
    type = replace_text
    target.kind = text
    target.slide_index = 1
    target.placeholder = body
    new_text = Quarterly revenue rose 21%.

    [operation]
    type = insert_media
    target.kind = slide
    target.slide_index = 1
    media_path = /abs/path/demo.wav
    placement.x_cm = 1.0
    placement.y_cm = 9.0
    placement.width_cm = 5.0
    placement.height_cm = 3.0
    name = Demo Media

    [operation]
    type = delete_item
    target.kind = media
    target.slide_index = 1
    target.shape_name = Demo Media
    """,
    mode="best_effort",
)

print(result.overall_status)

Snapshots

from pathlib import Path
from impress import snapshot_slide

result = snapshot_slide(doc_path, 0, "/tmp/slide1.png")
print(result.file_path, result.width, result.height)
Path(result.file_path).unlink(missing_ok=True)   # clean up used snapshots

Use snapshots to verify slide layout after text edits, master-page changes, table/chart placement, or other visual operations.

• Layouts such as TITLE_AND_CONTENT provide writable title/body placeholders immediately after add_slide().
• get_slide_inventory() may include shapes with empty names; use the returned inventory to discover the persisted identifiers available on a slide.
• User-supplied shape names can be normalized by LibreOffice in persisted inventory, for example spaces becoming underscores.

Common Mistakes

• Passing a relative path; UNO-facing Impress APIs expect absolute file paths.
• Using one-based slide indices.
• Using fragile single-word text anchors when a fuller phrase is available.
• Expecting exact shape names after LibreOffice-native slide duplication; UNO may rename duplicates such as Name 1.
• Supplying malformed JSON in items or data patch fields.
• Forgetting to clean up captured snapshots after inspection.
• Calling session methods after session.close().
• The "start" and "end" paragraph alignment options require LibreOffice 26.2+.