Use tab-size from EditorConfig #1239
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ncurses defines a global variable called TABSIZE which is the number of columns occupied by a tab character. We set this option to the value of the tab-size option. I believe we never rely on TABSIZE because we always expand tabs to the appropriate number of spaces before passing them to ncurses. The following patches will potentially give each screen its own tab-size, which is not possible with the global TABSIZE, so we should not be using it anyway.
The next patch wants to pass in a tab-size other than the global opt_tab_size, so let's add the parameters to enable that. The next commit really only cares about places where we render diff hunks. Hence, keep passing "opt_tab_size" (or for brevity, 0) to calls that never draw diff hunks anyway.
For projects that use tab width != 8, users want to set the "tab-size" config option. Many projects these days already state their preference in a ".editorconfig" file. GitHub honors that file when rendering diffs and blobs. Add an optional dependency to the EditorConfig library to read such files. Prefer the tab-size from EditorConfig, over the "tab-size" config option. Not being able to override the EditorConfig tab-size seems counterintuitive but I don't see why someone would want that, so I'd mayb ewait until someone complains. If we want that we could implement a "tab-size-from-editorconfig" option that defaults to true. Implementation hiccups: Unfortunately, we currently don't always fill "repo.worktree" - only in the special cases where either of $GIT_WORK_TREE or core.worktree is defined. Hence we need to run an extra "git rev-parse --show-toplevel". We do run "git rev-parse --is-inside-worktree [...]" elsewhere but we can't add "--show-toplevel" to that call or else we'd fail when run in bare repos. The use of diff_get_pathname() is a bit wasteful, we should probably refactor this to just remember the last line of type LINE_DIFF_ADD_FILE or LINE_DIFF_HEADER. Closes jonas#840
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For projects that use tab width != 8, we need to set the "tab-size"
config option. Many projects these days state their preference in a
".editorconfig" file.
Add an optional dependency to the EditorConfig library to read such
files. Prefer the tab-size from EditorConfig, over the "tab-size"
config option. Not being able to override the EditorConfig tab-size
seems counterintuitive but I don't see why someone would want that, so
I'd wait until someone complains. If we want that we could implement a
"tab-size-from-editorconfig" option that defaults to true.
Closes #840