Add scripts for automating more parts of the release process

Update dates in various files before the release automatically.

Also automatically update SHA-1 of the release files both before the
release (to zero them) and afterwards (to use the correct values).

Closes https://github.com/wxWidgets/wxWidgets/pull/443

build/tools/post-release.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+# Exit immediately if a command exits with a non-zero status.
+set -e
+
+# Build the file list for sha1sums, from `docs/release.md`
+declare -a files=(`sed -n '/^## Download Verification/,/^## Binaries/p' ../../docs/release.md | sed -n -E 's/^\s*0{40}\s{2}(wx.*)/\1/p'`)
+
+# Get the release version
+ver_string=`grep '#define wxVERSION_STRING ' ./../../include/wx/version.h | sed 's/^.*"wxWidgets \(.*\)")/\1/'`
+
+for i in "${files[@]}"
+do
+    # compute sha1sum
+    sha1sum=`sha1sum ./../../distrib/release/$ver_string/$i`
+
+    # save the sha1sum for this file
+    sed -i -E "/^\s*[0]{40}\s{2}wx/ s/(^\s*)[0]{40}(\s{2}$i)/\1$sha1sum\2/" ./../../docs/release.md
+done
+
+# Commit sha1sum related changes
+git commit -m "Update released files sha1sums after $ver_string release" ./../../docs/release.md

build/tools/pre-release.sh

@@ -0,0 +1,58 @@
+#!/bin/sh
+
+# build a list of English locales
+declare -a locale_list=("en_GB" "en_US")
+# get available en locales (including .utf8 and .UTF-8 ones)
+declare -a en_locales=(`locale -a | grep '^C\|^POSIX\|^en_'`)
+locale_list+=("${en_locales[@]}")
+
+found=0
+
+# set an English locale to get the month name
+for i in "${locale_list[@]}"
+do
+    LC_ALL="$i"
+
+    # check that setting the locale succeeded
+    # if it failed then LC_TIME would be empty
+    my_locale=`locale | grep LC_TIME | sed 's/.*"\(.*\)".*/\1/'`
+    if [ "$my_locale" = "$i" ]
+    then
+        echo Locale set to $i
+        found=1
+        break
+    fi
+done
+
+if [ $found = 0 ]
+then
+    echo Could not set an appropriate locale
+    exit 1
+fi
+
+# Exit immediately if a command exits with a non-zero status.
+set -e
+
+# get the month name and the year, see $(date +'%B %Y')
+# then use it in the relevant line (one before last)
+sed -i "/^The wxWidgets Team, / s/.*/The wxWidgets Team, $(date +'%B %Y')/" ./../../docs/readme.txt
+echo Updated date in docs/readme.txt
+
+# reset checksums to a string of 40 0-s, see $(printf '%.40d' 0)
+sed -i -E "/^\s*[0-9a-f]{40}\s{1,2}wx/ s/(\s*)[0-9a-f]{40}(\s{1,2}wx)/\1$(printf '%.40d' 0)\2/" ./../../docs/release.md
+echo Reset checksums in docs/release.md
+
+# get current date, see $(date +'%Y-%m-%d')
+# then use it in the line containing "X.X.X: (not released yet)"
+sed -i "/^[3-9]\.[0-9]\.[0-9]: (not released yet)$/ s/not released yet/released $(date +'%Y-%m-%d')/" ./../../docs/changes.txt
+echo Updated release date in docs/changes.txt
+
+# get current date, see $(date +'%B %d, %Y')
+# then use it in the line starting with @date
+sed -i "/^@date / s/.*/@date $(date +'%B %d, %Y')/" ./../../docs/doxygen/mainpages/manual.h
+echo Updated date in docs/doxygen/mainpages/manual.h
+
+# get current date, see $(date +'%B %d, %Y')
+# then use it in the first line
+sed -i "1s/^.* -- /$(date +'%B %d, %Y') -- /" ./../../docs/publicity/announce.txt
+echo Updated date in docs/publicity/announce.txt

docs/contributing/how-to-release.md

@@ -46,23 +46,22 @@ and then run it using the new DLLs.
 
 ## Pre-Release Steps
 
-* Update `docs/readme.txt`. Please review its contents in addition to just
-  changing the version number.
-* Update `docs/release.md` (the release sha1sums should be set to zeroes).
-* Put a date on the release line in `docs/changes.txt`.
-* Update the date in the manual (`docs/doxygen/mainpages/manual.h`).
-* Update the release announcement post in `docs/publicity/announce.txt`.
+1. Perform the following steps. You can run `build/tools/pre-release.sh` to do
+   the straightforward changes like updating the date and version number
+   automatically, but please also review and update the contents of the README
+   and announcement text.
+    * Update `docs/readme.txt`: version needs to be changed, content updated.
+    * Update `docs/release.md`: the release sha1sums should be set to zeroes.
+    * Put a date on the release line in `docs/changes.txt`.
+    * Update the date in the manual (`docs/doxygen/mainpages/manual.h`).
+    * Update the release announcement post in `docs/publicity/announce.txt`.
 
-Commit the changes and finally tag the release, preferably GPG-signed:
+2. Commit the changes and tag the release using your GPG key:
 
     git tag -s -m 'Tag X.Y.Z release' vX.Y.Z
 
-and otherwise unsigned:
-
-    git tag -m 'Tag X.Y.Z release' vX.Y.Z
-
-Don't overwrite existing tags. For non-final releases use e.g. `X.Y.Z-rc1`
-instead of `X.Y.Z`.
+   Don't overwrite existing tags. For non-final releases use e.g. `X.Y.Z-rc1`
+   instead of `X.Y.Z`.
 
 ## Creating Release Files
 
@@ -91,7 +90,8 @@ ensure you have the appropriate tag or commit checked out.
     wxMSW-x.y.z-Setup.exe
     wxWidgets-x.y.z.chm
 
-5. Update the sha1sums in `docs/release.md` and commit the changes.
+5. Run `./build/tools/post-release.sh` to update the sha1sums in
+   `docs/release.md` and commit the changes.
 
 ## Uploading