mirror of
https://github.com/walles/moar.git
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350 lines
10 KiB
Markdown
350 lines
10 KiB
Markdown
Moar is a pager. It's designed to just do the right thing without any
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configuration:
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The intention is that Moar should work as a drop-in replacement for
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[Less](http://www.greenwoodsoftware.com/less/). If you find that Moar
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doesn't work that way,
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[please report it](https://github.com/walles/moar/issues)!
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Doing the right thing includes:
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* **Syntax highlight** source code by default if
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[Highlight](http://www.andre-simon.de/doku/highlight/en/highlight.php)
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is installed.
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* **Search is incremental** / find-as-you-type just like in
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[Chrome](http://www.google.com/chrome) or
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[Emacs](http://www.gnu.org/software/emacs/)
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* Search becomes case sensitive if you add any UPPER CASE characters
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to your search terms, just like in Emacs
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* [Regexp](http://en.wikipedia.org/wiki/Regular_expression#Basic_concepts)
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search if your search string is a valid regexp
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* Supports displaying ANSI color coded texts (like the output from
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"git diff" for example)
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* Supports UTF-8 input and output
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* The position in the file is always shown
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Installing
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----------
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FIXME: End-user install instructions for the Go-built product
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...
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And now you can just invoke `moar` from the prompt!
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Setting Moar as Your Default Pager
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----------------------------------
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Set it as your default pager by adding...
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```bash
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export PAGER=/usr/local/bin/moar
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```
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... to your `.bashrc`.
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Issues
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------
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Issues are tracked [here](https://github.com/walles/moar/issues), or
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you can send questions to <johan.walles@gmail.com>.
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Developing
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----------
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Build+ run:
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```bash
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./moar.sh
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```
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Run integration tests:
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```bash
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./test.sh
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```
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Making a new Release
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--------------------
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FIXME: Go release instructions
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TODO
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----
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* Make search work cross color boundaries. Currently, if you have a syntax
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highlighted line and search for something across a color change you won't get
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any match.
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* Handle search hits to the right of the right screen edge. Searching
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forwards should move first right, then to the left edge and
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down. Searching backwards should move first left, then up and to the
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right edge (if needed for showing search hits).
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* Auto generate the in-program help text to correctly correspond to
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the actual key bindings.
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* If you try to bind the same key to multiple actions, that must be caught by
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the unit tests.
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* If you try to bind to an action that doesn't exist, that must be caught by
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the unit tests.
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* Read `source-highlight` output as a stream for startup performance reasons.
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This must work when `source-highlight` fails as well, and when it succeeds on
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an empty input file.
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* When skipping to the end, either while searching or when the user presses '>',
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try finding the end of the file for at most two seconds, then show wherever we
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are. Pressing '>' again or searching again should make another attempt until
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we're actually done.
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* Redefine 'g' without any prefix to prompt for which line to go
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to. This definition makes more sense to me than having to prefix 'g'
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to jump.
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* Start at a certain line if run as "moar.rb file.txt:42"
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* Enable home / end using home / end keys.
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* Always print the name of the file being shown in the status field.
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* Support viewing multiple files by pushing them in reverse order on
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the view stack.
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* Add search line editing
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* Try to find a newer Ruby version if needed for color support and
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exec() with that instead if available.
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* Write "/ to search" somewhere in the status field
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* Incremental search using ^s and ^r like in Emacs
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* Gunzip input files with .gz extension before displaying them
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* Warn but don't hang if we get an incomplete UTF-8 sequence from
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getch() in wide_getch(). Hanging won't be that much of a problem
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assuming users will press more keys if nothing happens, thus
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resolving the hang.
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* Enable up / down using the mouse wheel.
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DONE
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----
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* Enable exiting using q (restores screen)
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* Handle the terminal window getting resized.
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* Print info line in inverse video
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* Enable up / down using arrow keys.
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* Prevent pressing down past the last line of the file.
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* Enable out-of-file visualization with ~ like less.
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* Enable up / down using page-up and page-down keys.
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* Enable home / end using < and >.
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* Enable file input.
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* Enable continuous position display with everything we know (lines
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visible, percentages, like less).
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* Enable stdin input.
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* Truncate lines that are longer than the screen width
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* Make sure we can print all the way into the rightmost column of the
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screen when truncating too long lines. We should strip() lines
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before we print them and manually move the cursor to the next line
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after each.
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* Handle all kinds of line endings.
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* Handle files missing an ending newline.
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* Handle hitting BACKSPACE in the search field
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* Incremental search using /
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* Typing backspace in the line editor when it's empty should make the
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line editor say "done".
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* Change out-of-file visualization to writing --- after the end of the
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file and leaving the rest of the screen blank.
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* Scroll down if we have no search hits on the current screen
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* Wrap search if we have search hits above but not below
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* Find next using n
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* Highlight search hits using reverse video
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* Make sure we can properly render all lines of /etc/php.ini.default
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without the bottom-of-the-screen prompt moving around.
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* Find previous using N
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* Indicate when we're wrapping the search while pressing n.
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* Indicate when we're wrapping the search while pressing N.
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* Highlight all matches while searching
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* Scroll down one line on RETURN
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* Print warnings to stderr after the run, for example if we aren't
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using color support because of a too-old version of Ruby.
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* Make stdin input work even on newer (than 1.8) versions of
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Ruby. Apparently
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[this patch](http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/io.c?r1=7641&r2=7649&diff_format=h)
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is the reason it doesn't
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work. [Reported to the Ruby issue tracker](https://bugs.ruby-lang.org/issues/9067),
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let's see how that goes.
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* Enable displaying colorized output from "git diff"
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* Arrow down through the whole file, then arrow up again
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* Page down through the whole file, then page up again
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* Search highlighting
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* Use the same algorithm for highlighting as for determining which
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lines match.
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* Make the search case sensitive only if it contains any capital
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letters.
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* Do a regexp search if the search term is a valid regexp, otherwise
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just use it as a substring.
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* Make the search case sensitive only if it contains any capital
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letters, for both regexps and non-regexps.
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* If we print warnings at the end, also print an URL where they can be
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reported.
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* If we crash with a stacktrace, print an URL where it can be reported
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* Enable sideways scrolling using arrow keys.
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* Warn about any unhandled keypresses during search.
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* Enable displaying a man page
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* Arrow down through the whole file, then arrow up again
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* Page down through the whole file, then page up again
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* Search highlighting
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* Make sure we get the line length right even with unicode characters
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present in the lines. Verify by looking at where the truncation
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markers end up.
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* Make sure we can search for unicode characters
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* Work around
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[the issue with getch not returning unicode chars](https://bugs.ruby-lang.org/issues/9094)
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* Work around
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[the issue with Regexp.quote() returning non-unicode strings](https://bugs.ruby-lang.org/issues/9096)
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* Warn but don't crash if we get an invalid UTF-8 sequence from
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getch() in wide_getch().
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* Make sure the LANG environment variable is printed if there are
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warnings.
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* Make sure some kind of platform information is printed if there are
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warnings.
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* Make sure the Ruby version is printed if there are warnings.
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* Startup exceptions should be caught through the same reporting
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thingy as everything else.
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* We must not crash on getting binary data. Testcase: "moar.rb /bin/ls"
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* Fix handling of TAB characters in the input
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* Run rubocop as part of test.rb if installed and have the exit code
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reflect any issues.
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* Make sure version information is printed if there are warnings.
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* Make it possible to install system-wide using "rake install". Don't
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forget to fix the version number when doing this.
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* Enable --help for help
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* Enable --version for version information.
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* Report command line errors, think about different command line
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requirements depending on whether we're piping input into moar.rb or
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listing input files on the command line.
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Command line formats we want to support:
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* moar.rb file.txt
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* moar.rb < file.txt
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Command line formats we *don't* want to support:
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* moar.rb file1.txt file2.txt
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* moar.rb file1.txt < file2.txt
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* Enable 'h', '?' or F1 for help
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* Print something nice on file-not-found.
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* Test on Ubuntu
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* Test on Ruby 1.8.something. We did, and due to missing UTF-8 support
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in Ruby 1.8 we just dropped support for it. Now we print an error
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message if Ruby < 1.9 is detected.
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* Add info to the end of the --help output on how to set Moar to be
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your default pager.
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* Add licensing information (BSD)
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* Enable source code highlighting by pre-filtering using GNU
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Source-highlight.
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* Retain the search string when pressing / to search a second time.
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* Exit search mode and cancel the search on ESC. Because that's what I
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feel like pressing.
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* Exit search mode and cancel the search on ^G. For compatibility with
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Emacs.
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* Make sure searching for an upper case unicode character turns on
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case sensitive search.
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* Doing moar.rb on an arbitrary binary (like /bin/ls) should put all
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line-continuation markers at the rightmost column. This really
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means our truncation code must work even with things like tabs and
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various control characters.
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* Enable exiting using ^c (without restoring the screen).
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* Enable pass-through operation unless $stdout.isatty()
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* Accept numeric prefixes just like less. Implement for 'g', 'G' and
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SPACE to begin with.
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* Exit search on pressing up / down / pageup / pagedown keys and
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scroll. I attempted to do that spontaneously, so it's probably a
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good idea.
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* Searching for something above us should wrap the search.
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* When pressing '/' to edit the search terms, find a hit and
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re-highlight.
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* Make sure "git grep" output gets highlighted properly.
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* Lazy load big / slow streams
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* Add making binaries to the Making a new Release section above.
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