[PATCH V3] histedit: add a hint about enabled dropmissing to histedit edit comment

[Augie Fackler]

On Sat, Mar 19, 2016 at 11:40:18AM -0700, Mateusz Kwapich wrote:
> # HG changeset patch
> # User Mateusz Kwapich <mitrandir at fb.com>
> # Date 1458412753 25200
> #      Sat Mar 19 11:39:13 2016 -0700
> # Node ID 7b5be7eb887fbfad229a3774a25f95da146511bd
> # Parent  dfb21c34e07dfeeccb9be6197ad15733ee53a48e
> histedit: add a hint about enabled dropmissing to histedit edit comment

Queued, thanks.

>
> Adds a hint to histedit comment reminding user about enabled dropmissing.
> This will make the enabled dropmissing more visible. The example comment:
>
> # Edit history between b592564a803c and b54649a8a63f
> #
> # Commits are listed from least to most recent
> #
> # You can reorder changesets by reordering the lines
> #
> # Commands:
> #
> #  e, edit = use commit, but stop for amending
> #  m, mess = edit commit message without changing commit content
> #  p, pick = use commit
> #  b, base = checkout changeset and apply further changesets from there
> #  d, drop = remove commit from history
> #  f, fold = use commit, but combine it with the one above
> #  r, roll = like fold, but discard this commit's description
> #
> # Deleting a changeset from the list will DISCARD it from the edited history!
>
> diff --git a/hgext/histedit.py b/hgext/histedit.py
> --- a/hgext/histedit.py
> +++ b/hgext/histedit.py
> @@ -220,13 +220,14 @@ secondaryactions = set()
>  tertiaryactions = set()
>  internalactions = set()
>
> -def geteditcomment(first, last):
> +def geteditcomment(ui, first, last):
>      """ construct the editor comment
>      The comment includes::
>       - an intro
>       - sorted primary commands
>       - sorted short commands
>       - sorted long commands
> +     - additional hints
>
>      Commands are only included once.
>      """
> @@ -255,8 +256,14 @@ Commands:
>          addverb(v)
>      actions.append('')
>
> -    return ''.join(['# %s\n' % l if l else '#\n'
> -                    for l in ((intro % (first, last)).split('\n')) + actions])
> +    hints = []
> +    if ui.configbool('histedit', 'dropmissing'):
> +        hints.append("Deleting a changeset from the list "
> +                     "will DISCARD it from the edited history!")
> +
> +    lines = (intro % (first, last)).split('\n') + actions + hints
> +
> +    return ''.join(['# %s\n' % l if l else '#\n' for l in lines])
>
>  class histeditstate(object):
>      def __init__(self, repo, parentctxnode=None, actions=None, keep=None,
> @@ -1186,7 +1193,8 @@ def _aborthistedit(ui, repo, state):
>  def _edithisteditplan(ui, repo, state, rules):
>      state.read()
>      if not rules:
> -        comment = geteditcomment(node.short(state.parentctxnode),
> +        comment = geteditcomment(ui,
> +                                 node.short(state.parentctxnode),
>                                   node.short(state.topmost))
>          rules = ruleeditor(repo, ui, state.actions, comment)
>      else:
> @@ -1232,7 +1240,7 @@ def _newhistedit(ui, repo, state, revs,
>
>      ctxs = [repo[r] for r in revs]
>      if not rules:
> -        comment = geteditcomment(node.short(root), node.short(topmost))
> +        comment = geteditcomment(ui, node.short(root), node.short(topmost))
>          actions = [pick(state, r) for r in revs]
>          rules = ruleeditor(repo, ui, actions, comment)
>      else:
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