package docfd
Install
Dune Dependency
Authors
Maintainers
Sources
sha256=1e7f27e02c9becf1cb305d8e078022acce53c4010040e9a92693b5fec59de0ce
Description
Think interactive grep for both text files and PDFs, but word/token based instead of regex and line based, so you can search across lines easily.
Docfd aims to provide good UX via integration with common text editors and PDF viewers, so you can jump directly to a search result with a single key press.
Features:
-
Multithreaded indexing and searching
-
Multiline fuzzy search of multiple files or a single file
-
Swap between multi-file view and single file view on the fly
-
Content view pane that shows the snippet surrounding the search result selected
-
Text editor and PDF viewer integration
README
Docfd
TUI multiline fuzzy document finder
Navigating repo:
Navigating "OCaml Programming: Correct + Efficient + Beautiful" book PDF and opening it to the closest location to the selected search result via PDF viewer integration:
Installation
Statically linked binaries are available via GitHub releases
Features
Multithreaded indexing and searching
Multiline fuzzy search of multiple files or a single file
Swap between multi-file view and single file view on the fly
Content view pane that shows the snippet surrounding the search result selected
Text editor and PDF viewer integration
Integration details
Text editor integration
Docfd uses the text editor specified by $VISUAL (this is checked first) or $EDITOR.
Docfd opens the file at first line of search result for the following editors:
nanonvim/vim/vikakhxemacsmicrojed/xjed
PDF viewer integration
Docfd guesses the default PDF viewer based on the output of xdg-mime query default application/pdf, and invokes the viewer either directly or via flatpak depending on where the desktop file can be first found in the list of directories specified by $XDG_DATA_DIRS.
Docfd opens the file at first page of the search result and starts a text search of the most unique word of the matched phrase within the same page for the following viewers:
okular
evince
xreader
atril
Docfd opens the file at first page of the search result for the following viewers:
mupdf
Usage
Read from piped stdin
command | docfd
Docfd uses Single file view when source of document is piped stdin.
Files specified as arguments to docfd are ignored in this case.
Read from files
docfd [PATH...]
The list of paths can contain directories. Each directory in the list is scanned recursively for files with one of the following extensions by default:
.txt.md.pdf
You can change the file extensions to use via --exts, or add onto the list of extensions via --add-exts.
If the list of paths is empty, then Docfd defaults to scanning the current directory ..
If any of the file ends with .pdf, then pdftotext is required to continue.
If exactly one file is specified in the list of paths, then Docfd uses Single file view. Otherwise, Docfd uses Multi-file view.
If any of the path is ?, then file selection of the discovered files via fzf is invoked.
Multi-file view
The default TUI is divided into four sections:
Left is the list of documents which satisfy the search phrase
Top right is the content view of the document which tracks the search result selected
Bottom right is the ranked search result list
Bottom pane consists of:
Status bar
Key binding info
File content requirement field
Search field
Controls
Docfd operates in modes, the initial mode is Navigation mode.
Navigation mode
Scroll down the document list
jDown arrow
Page down
Scroll down with mouse wheel when hovering above the area
Scroll up the document list
kUp arrow
Page up
Scroll up with mouse wheel when hovering above the area
Scroll down the search result list
Shift+JShift+Down arrowShift+Page downScroll down with mouse wheel when hovering above the area
Scroll up the document list
Shift+KShift+Up arrowShift+Page upScroll up with mouse wheel when hovering above the area
Open document
EnterDocfd tries to use
$VISUALfirst, if that fails then Docfd tries$EDITOR
Switch to single file view
Tab
Switch to
Require contentmode?
Switch to
Searchmode/
Clear search phrase
x
Exit Docfd
Esc,Ctrl+CorCtrl+Q
Search mode
Search field is active in this mode
Enterto confirm search phrase and exit the mode
Require content mode
Required content field is active in this mode
Enterto confirm file content requirements and exit the mode
Search phrase and search procedure
Document content and user input in the search field are tokenized/segmented in the same way, based on:
Contiguous alphanumeric characters
Individual symbols
Individual UTF-8 characters
Spaces
A search phrase is a list of said tokens.
Search procedure is a DFS through the document index, where the search range for a word is fixed to a configured range surrounding the previous word (when applicable).
A token in the index matches a token in the search phrase if they are:
A case-insensitive exact match
Or a case-insensitive substring match (token in search phrase being the substring)
Or within the configured case-insensitive edit distance threshold
Search results are then ranked using heuristics.
File content requirements
The required content field accepts a content requirement expression.
A content requirement expression is one of:
Search phrase
(expression)expression & expressionexpression | expression
Note that the edit distance is not considered here. Only case-insensitive exact matches or substring matches against the search phrases are considered.
In other words, given the same phrase, it is treated less fuzzily as a content requirement expression compared to being used as a search phrase in the search field.
Single file view
If the specified path to Docfd is not a directory, then single file view is used.
In this view, the TUI is divided into only two sections:
Top is ranked search result list
Bottom is the search interface
Controls
The controls are simplified in single file view, namely Shift is optional for scrolling through search result list.
Navigation mode
Scroll down the search result list
jDown arrow
Page down
Shift+JShift+Down arrowShift+Page downScroll down with mouse wheel when hovering above the area
Scroll up the document list
kUp arrow
Page up
Shift+KShift+Up arrowShift+Page upScroll up with mouse wheel when hovering above the area
Open document
EnterDocfd tries to use
$VISUALfirst, if that fails then Docfd tries$EDITOR
Switch to multi-file view
Tab
Switch to
Searchmode/
Clear search phrase
x
Exit Docfd
Esc,Ctrl+CorCtrl+Q
Search mode
Search field is active in this mode
Enterto confirm search phrase and exit search mode
Limitations
File auto-reloading is not supported for PDF files, as PDF viewers are invoked in the background via shell. It is possible to support this properly in the ways listed below, but requires a lot of engineering for potentially very little gain:
Docfd waits for PDF viewer to terminate fully before resuming, but this prohibits viewing multiple search results simultaneously in different PDF viewer instances.
Docfd manages the launched PDF viewers completely, but these viewers are closed when Docfd terminates.
Docfd invokes the PDF viewers via shell so they stay open when Docfd terminates. Docfd instead periodically checks if they are still running via the PDF viewers' process IDs, but this requires handling forks.
Outside of tracking whether the PDF viewer instances interacting with the files are still running, Docfd also needs to set up file update handling either via
inotifyor via checking file modification times periodically.
Acknowledgement
Demo gifs are made using vhs.