Get go version from go.mod

No need to update multiple places when bumping the go version.

.github/workflows/ci.yml

@@ -5,7 +5,6 @@ env:
     ASAN_OPTIONS: leak_check_at_exit=0
     LC_ALL: en_US.UTF-8
     LANG: en_US.UTF-8
-    GO_INSTALL_VERSION: ">=1.20.0"
 
 permissions:
   contents: read # to fetch code (actions/checkout)
@@ -58,7 +57,7 @@ jobs:
           - name: Install Go
             uses: actions/setup-go@v3
             with:
-              go-version: ${{ env.GO_INSTALL_VERSION }}
+              go-version-file: go.mod
 
           - name: Build kitty
             run: python .github/workflows/ci.py build
@@ -88,7 +87,7 @@ jobs:
           - name: Install Go
             uses: actions/setup-go@v3
             with:
-              go-version: ${{ env.GO_INSTALL_VERSION }}
+              go-version-file: go.mod
 
           - name: Install build-only deps
             run: python -m pip install -r docs/requirements.txt ruff mypy types-requests types-docutils
@@ -137,7 +136,7 @@ jobs:
           - name: Install Go
             uses: actions/setup-go@v3
             with:
-              go-version: ${{ env.GO_INSTALL_VERSION }}
+              go-version-file: go.mod
 
           - name: Build kitty
             run: which python3 && python3 .github/workflows/ci.py build
@@ -162,7 +161,7 @@ jobs:
           - name: Install Go
             uses: actions/setup-go@v3
             with:
-              go-version: ${{ env.GO_INSTALL_VERSION }}
+              go-version-file: go.mod
 
           - name: Build kitty
             run: python3 .github/workflows/ci.py build

.github/workflows/codeql-analysis.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Install Go
       uses: actions/setup-go@v3
       with:
-        go-version: ">=1.20.0"
+        go-version-file: go.mod
 
     - name: Checkout repository
       uses: actions/checkout@v3

docs/build.rst

@@ -46,7 +46,7 @@ Run-time dependencies:
 Build-time dependencies:
 
 * ``gcc`` or ``clang``
-* ``go >= 1.20`` (see :file:`go.mod` for go packages used during building)
+* ``go`` >= _build_go_version (see :file:`go.mod` for go packages used during building)
 * ``pkg-config``
 * For building on Linux in addition to the above dependencies you might also
   need to install the following packages, if they are not already installed by

docs/conf.py

@@ -106,8 +106,17 @@ rst_prolog = '''
 '''.replace('VERSION', str_version)
 smartquotes_action = 'qe'  # educate quotes and ellipses but not dashes
 
+def go_version(go_mod_path: str) -> str:  # {{{
+    with open(go_mod_path) as f:
+        for line in f:
+            if line.startswith('go '):
+                return line.strip().split()[1]
+    raise SystemExit(f'No Go version in {go_mod_path}')
+# }}}
+
 string_replacements = {
     '_kitty_install_cmd': 'curl -L https://sw.kovidgoyal.net/kitty/installer.sh | sh /dev/stdin',
+    '_build_go_version': go_version('../go.mod'),
 }