Felitendo
4004023297
"Apply now" had nothing to do in the normal case. Enabling applies, the watcher handles everything installed afterwards, and the settings and applications screens apply on their way out - so pressing it answered "already applied to 14 applications" and that was the whole interaction. It is now "Re-apply everything": the state is taken back and written again from scratch. That is the answer to the question the status block can raise but nothing could act on - Steam showing as not patched after a client update, an application that drifted, a flag file edited by hand. Uninstalling an application used to leave the entry shadowing it behind, in the user home where the package manager cannot see it, offering to start a program that is gone. A plain apply only looks at what exists now, so the watcher never noticed either. Those are removed on every apply now, not just when rebuilding.
153 lines
5.3 KiB
Scdoc
153 lines
5.3 KiB
Scdoc
middleclick-autoscroll(1)
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# NAME
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middleclick-autoscroll - middle-click autoscroll in every application that supports it
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# SYNOPSIS
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*middleclick-autoscroll* [_command_]
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# DESCRIPTION
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Blink, the engine inside Chromium, Electron and CEF, implements Windows-style
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autoscroll: hold the middle mouse button and the page scrolls with the pointer.
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On Linux it is switched off, because middle click is taken by primary-selection
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paste. It can be turned back on with *--enable-blink-features=MiddleClickAutoscroll*
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on the command line.
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*middleclick-autoscroll* finds every Chromium-based application on the system
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and puts that argument somewhere the application will actually read it, then
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keeps doing so for anything installed later.
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Run without a command it shows an interactive menu. Everything it can be told
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is reachable from there; the configuration file behind it does not need to be
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edited by hand.
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Nothing outside the user's home directory is written to, and running it as root
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is refused.
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# COMMANDS
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*enable*
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Turn autoscroll on, apply it to everything installed, and start watching
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for new applications.
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*disable*
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Turn it off and put every file that was changed back the way it was.
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*apply* [*--rebuild*]
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Apply to anything that has appeared since the last run. This is what the
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watcher calls; running it by hand is only needed when the watcher is off.
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Entries left behind by an application that has since been uninstalled are
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removed here too - the entry shadowing it lives in the user's home, where
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the package manager that removed the application cannot see it.
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With *--rebuild* everything is taken back first and written again from
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scratch. That is the repair: it does not care what looks correct already.
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*status*
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How many applications are covered, whether Steam is patched, and when the
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last run was.
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*list*
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Every Chromium-based application that was found, and how each one is
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handled.
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*-h*, *--help*
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Show a summary of the commands.
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*-V*, *--version*
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Show the version.
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# HOW THE ARGUMENT GETS IN
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Two ways, chosen per application.
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*Flag file*
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Arch's Electron and Chromium wrappers read extra arguments from
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_$XDG_CONFIG_HOME/<name>-flags.conf_. This is the preferred route: it is
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the supported way to pass arguments, it survives package upgrades, and it
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applies to a launch from a terminal as much as one from the menu. An
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*--enable-blink-features* line that is already in the file is extended
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rather than duplicated - Chromium keeps only the last occurrence of that
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option, so a second one would switch the first one off.
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*Desktop entry*
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For applications that ship their own binary with no wrapper, and for
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Flatpaks, a copy of the desktop entry with the argument appended is written
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to _~/.local/share/applications_, where it shadows the system one. Entries
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that already live there - AppImages, web app shortcuts - are edited in
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place, with the original kept.
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A generated entry is marked *X-MCA-Generated* and an entry edited in place
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*X-MCA-Patched*. The two are never confused: the first is deleted when
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undoing, the second is restored from its backup. An entry with neither
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marker belongs to somebody else and is left alone.
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Programs that start themselves at login write their own entry into
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_~/.config/autostart_ pointing straight at their binary, bypassing the menu
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entry entirely. Those are patched in place as well.
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# STEAM
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Steam's interface is CEF and supports the feature, but Steam builds the command
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line for its web helper itself. The only way in is the script that starts the
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helper, inside Steam's own installation:
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~/.local/share/Steam/ubuntu12_64/steamwebhelper_sniper_wrap.sh
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Steam checksums that script at every start and restores it when it differs, so
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its launcher entry also gets *-noverifyfiles*. The trade-off is that Steam no
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longer repairs a damaged installation on its own; that is why Steam is a switch
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of its own in the settings.
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Starting Steam from a terminal without *-noverifyfiles* undoes the patch for
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that session. The watcher notices and puts it back, so the next start has it
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again.
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# SPOTIFY
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The official client is CEF rather than Electron. Installed through
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*spotify-launcher*, it is started by a program that builds its own command line
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and has a configuration file with a slot for extra arguments; that slot is
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where the flag goes. Installed as a plain package, it is an ordinary desktop
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entry and needs nothing special.
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# WHAT CANNOT BE DETECTED
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An AppImage keeps its payload in a compressed filesystem, so there is no way to
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tell from the outside whether it contains Chromium. Those are listed as *cannot
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tell* and left alone until they are switched on from the applications screen.
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# FILES
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_~/.config/middleclick-autoscroll/config_
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Written by the program. Every option in it is reachable from the menu.
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_~/.local/state/middleclick-autoscroll/ledger_
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One line per change, so *disable* can undo exactly what was done and
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nothing else.
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_~/.local/state/middleclick-autoscroll/backup/_
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Copies of the files that are edited in place rather than shadowed.
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_~/.cache/middleclick-autoscroll/detect_
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Which programs were found to be Chromium, keyed by size and modification
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time. Safe to delete.
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# ENVIRONMENT
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*NO_COLOR*
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Disables colour.
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# SEE ALSO
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*systemctl*(1), *flatpak*(1)
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# AUTHORS
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Felitendo. Source and issue tracker at
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https://github.com/Felitendo/middleclick-autoscroll
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